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2012

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Articles 17371 - 17400 of 23316

Full-Text Articles in Social and Behavioral Sciences

The Algorithm Of Equal Acceptance Region For Detecting Copy Number Alterations: Applications To Next-Generation Sequencing Data, Yan-Xia Lin Jan 2012

The Algorithm Of Equal Acceptance Region For Detecting Copy Number Alterations: Applications To Next-Generation Sequencing Data, Yan-Xia Lin

Faculty of Engineering and Information Sciences - Papers: Part A

The information of copy number alterations (gains and losses) in tumour genomes can be used to discovery cancer-causing genes. The estimate of copy number can be obtained from the estimate copy number ratio. The higher the depth of underlying sequencing data, the more accurate the estimate of copy number ratio. At the same time, the higher depth of a sequencing data used in copy number analysis, the more cost of data analysis. To develop a method for identifying a necessary depth of sequencing data for copy number analysis before test data are produced is of interest. In this paper, we …

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Scene Segmentation And Pedestrian Classification From 3-D Range And Intensity Images, Xue Wei, Son Lam Phung, Abdesselam Bouzerdoum Jan 2012

Scene Segmentation And Pedestrian Classification From 3-D Range And Intensity Images, Xue Wei, Son Lam Phung, Abdesselam Bouzerdoum

Faculty of Engineering and Information Sciences - Papers: Part A

This paper proposes a new approach to classify obstacles using a time-of-flight camera, for applications in assistive navigation of the visually impaired. Combining range and intensity images enables fast and accurate object segmentation, and provides useful navigation cues such as distances to the nearby obstacles and obstacle types. In the proposed approach, a 3-D range image is first segmented using histogram thresholding and mean-shift grouping. Then Fourier and GIST descriptors are applied on each segmented object to extract shape and texture features. Finally, support vector machines are used to recognize the obstacles. This paper focuses on classifying pedestrian and non-pedestrian …

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It Consultants' Voluntary Contract Termination - A Psychological Contract Perspective, Gro Bjerknes, Karlheinz Kautz Jan 2012

It Consultants' Voluntary Contract Termination - A Psychological Contract Perspective, Gro Bjerknes, Karlheinz Kautz

Faculty of Engineering and Information Sciences - Papers: Part A

This research explores the question why IT consultants terminate their employment contracts in a labour market with job drought, downsizing and salary cuts when they were among those who kept their jobs during layoffs. A process model for the maintenance of a psychological contract between employees and employers is presented, which combines the concept of psychological contract with a theory of the relation between intrinsic motivation and management practices and with theories of identity, self-esteem, influence and power. The research verifies and specifies the model based on a revelatory case study. The model helps explaining IT consultants' behavior of voluntarily …

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Information Systems Development Projects As Complex Adaptive Systems, Karlheinz Kautz Jan 2012

Information Systems Development Projects As Complex Adaptive Systems, Karlheinz Kautz

Faculty of Engineering and Information Sciences - Papers: Part A

This research considers information systems development (ISD) projects as complex adaptive systems. We investigate the question whether complex adaptive systems (CAS) theory is relevant as a theoretical foundation for understanding ISD, and if so, which kind of understanding can be achieved by utilizing the theory? We introduce key concepts of CAS theory such as interaction, emergence, interconnected autonomous agents, selforganization, co-evolution, poise at the edge of chaos, time pacing, and poise at the edge of time to analyse and understand ISD in practice. We demonstrate the strength of such a CAS approach through an empirical case study presentation and analysis. …

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Improved Initial Class Diagrams With Atsa:Oo, Robert B. K Brown, Angela Piper Jan 2012

Improved Initial Class Diagrams With Atsa:Oo, Robert B. K Brown, Angela Piper

Faculty of Engineering and Information Sciences - Papers: Part A

Despite the popularity of Object Oriented programming and design, their analysis phase is difficult to learn and relies heavily on the analyst's intuition and experience. Even industry practitioners can produce initial class diagrams requiring time-consuming refinements in the design phase. Business clients can find it difficult to follow its diverse techniques and constructs. The A TSA method offers analysis under a single theoretical framework that is specifically designed to be easily understood by both neophyte practitioners and business clients. However as it follows the procedural paradigm, it is not suitable for direct 00 application. This paper presents an adaptation of …

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Voltage Security Constrained Reactive Power Optimization Incorporating Wind Generation, L G. Meegahapola, E Vittal, A Keane, D Flynn Jan 2012

Voltage Security Constrained Reactive Power Optimization Incorporating Wind Generation, L G. Meegahapola, E Vittal, A Keane, D Flynn

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents a comparative analysis between conventional optimal power flow (OPF) and voltage constrained OPF strategies with wind generation. The study has been performed using the New England 39 bus system with 12 doublyfed induction generator (DFIG) based wind farms installed across the network. A voltage security assessment is carried out to determine the critical wind farms for voltage stability enhancement. The power losses and individual wind farm reactive power generation have been compared with and without voltage stability constraints imposed on the OPF simulation. It is shown that voltage constrained OPF leads to much greater active power losses …

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Studying The Impact Of The Corner Propagation Model On Vanet Routing In Urban Environments, Abhinay Mukunthan, Craig Cooper, Farzad Safaei, D. Franklin, Mehran Abolhasan Jan 2012

Studying The Impact Of The Corner Propagation Model On Vanet Routing In Urban Environments, Abhinay Mukunthan, Craig Cooper, Farzad Safaei, D. Franklin, Mehran Abolhasan

Faculty of Engineering and Information Sciences - Papers: Part A

Accurate modelling of the radio channel is often the most difficult aspect of a Vehicular Ad Hoc Network (VANET) simulation due to the large variability present in vehicular terrain. CORNER is a propagation model that calculates path-loss in an urban terrain with a large concentration of buildings, based on the position of the transmitter and receiver on a street map. This paper proposes additions to the CORNER propagation model to take selective multi-path fading into account and investigates the performance of the GPSR routing protocol under the CORNER propagation model in a realistic city environment.

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Indian Millennials: Are Microchip Implants A More Secure Technology For Identification And Access Control?, Christine Perakslis, Katina Michael Jan 2012

Indian Millennials: Are Microchip Implants A More Secure Technology For Identification And Access Control?, Christine Perakslis, Katina Michael

Faculty of Engineering and Information Sciences - Papers: Part A

This mixed methods study with a sequential explanatory strategy explored qualitatively the statistically significant quantitative findings relative to Indian respondents' perceptions about RFID (radio frequency identification) transponders implanted into the human body. In the first analysis phase of the study, there was a significant chi-square analysis reported (χ2 = 56.64, df = 3, p =.000) relative to the perception of small business owners (N = 453) that implanted chips are a more secure form of identification and/or access control in organizations and the respondents' country of residence. Countries under study included Australia, India, the UK and US. The country contributing …

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Characteristics Of Power Quality Disturbance Levels In Australia, Sean Elphick, Vic Smith, Vic Gosbell, Robert Barr Jan 2012

Characteristics Of Power Quality Disturbance Levels In Australia, Sean Elphick, Vic Smith, Vic Gosbell, Robert Barr

Faculty of Engineering and Information Sciences - Papers: Part A

The Australian Long Term Power Quality Survey (LTNPQS) now covers 2,000 sites with a range of different characteristics including strength (related to fault level), line construction and dominant load type. This paper details the latest outcomes of the LTNPQS project in terms of both disturbance levels and reporting methods. A comparison of the differences between voltage, unbalance and harmonic THD levels at strong (close to transformer) and weak (towards the end of LV feeders) sites has been performed and significant differences have been found. A multivariable linear regression study has been undertaken in order to investigate the correlation between site …

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Sax-Based Decomposition Of Non-Stationary Power Quality Waveforms, M J. Afroni, Darmawan Sutanto, D Stirling Jan 2012

Sax-Based Decomposition Of Non-Stationary Power Quality Waveforms, M J. Afroni, Darmawan Sutanto, D Stirling

Faculty of Engineering and Information Sciences - Papers: Part A

The Hilbert Huang Transform (HHT) is a powerful tool for Power Quality (PQ) classifications. One of the main advantages of the HHT is its ability to analyze non-stationary complex waveforms with very good time resolution. However, like other waveform classification techniques, it has difficulty in resolving the instant of sudden changes in the waveform. To overcome the above problems, SAX (Symbolic Aggregate ApproXimation) method is proposed to convert the signal into symbols which facilitates a pattern detector algorithm to identify the border of the stationary signals within a non-stationary signal. Results from simulations will be provided and discussed. © 2012 …

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Towards Modelling Real Time Constraints, Amir Ashamalla, Ghassan Beydoun, Graham Low, Jun Yan Jan 2012

Towards Modelling Real Time Constraints, Amir Ashamalla, Ghassan Beydoun, Graham Low, Jun Yan

Faculty of Engineering and Information Sciences - Papers: Part A

Software agents are highly autonomous, situated and interactive software components. They autonomously sense their environment and respond accordingly. Agents behaviours are often constrained by by real time constraints such as the time in which the agent is expected to respond .i.e. time needed for a task to complete. Failing to meet such a constraint can result in a task being not achieved. This possibly causes an agent or a system to fail, depending on how critical the task is to the agent or system as a whole. Our research aims at identifying and modelling real time constraints in the early …

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Sharing Government-Owned Data With The Public: A Cross-Country Analysis Of Open Data Practice In The Middle East, Jazem Mutared Alanazi, Akemi Chatfield Jan 2012

Sharing Government-Owned Data With The Public: A Cross-Country Analysis Of Open Data Practice In The Middle East, Jazem Mutared Alanazi, Akemi Chatfield

Faculty of Engineering and Information Sciences - Papers: Part A

Since 2009, open government policies, open data, and social media use in government have been actively promoted by democratic governments around the world to promote the goals of government transparency, citizen engagement, and collaboration. To date, however, there is a lack of empirical research into open government practice. This knowledge gap has managerial and public policy implications for democratic governments and, importantly, for the governments in the Middle East in which explosive growth has occurred in the number of users of the Internet and social media. This research attempts to reduce this gap by examining the maturity level in open …

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The Use Of Transient State Estimation For Voltage Dip/Sag Assessment, A Farzanehrafat, N R. Watson, S Perera Jan 2012

The Use Of Transient State Estimation For Voltage Dip/Sag Assessment, A Farzanehrafat, N R. Watson, S Perera

Faculty of Engineering and Information Sciences - Papers: Part A

Voltage sags are common events on the electric power network caused by network faults and the large load connections. This power quality issue can affect a wide range of electrical equipment malfunctions, interruptions or losses and are of particular concern to industry. A complete knowledge of the source is a prerequisite before any remedial action is taken. On the other hand, it is not feasible to fully monitor voltage sags occurred throughout the network. For this reason state estimation techniques have been extended into power quality issues and called Power Quality State Estimation (PQSE). This paper, introduces the use of …

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Finite Element Analysis Of Debonding Failures In Cfrp-Strengthened Rectangular Steel Tubes Subjected To An End Bearing Load, D Fernando, T Yu, J G. Teng Jan 2012

Finite Element Analysis Of Debonding Failures In Cfrp-Strengthened Rectangular Steel Tubes Subjected To An End Bearing Load, D Fernando, T Yu, J G. Teng

Faculty of Engineering and Information Sciences - Papers: Part A

The end bearing capacity of a rectangular steel tube can be substantially increased through local strengthening by bonding carbon fiber reinforced polymer (CFRP) plates to the webs of the steel tube. Existing studies have revealed that failure of such a strengthened tube generally occurs by debonding of the CFRP plates from the steel tube and the effectiveness of this strengthening method depends significantly on the properties of the adhesive. This paper presents a finite element (FE) study on debonding failures in such CFRP-strengthened rectangular steel tubes subjected to an end bearing load. In the proposed FE model, a bond-slip model …

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Experimental Investigation Of A Hydraulically Interconnected Suspension In Vehicle Dynamics And Stability Control, Lifu Wang, Nong Zhang, Haiping Du Jan 2012

Experimental Investigation Of A Hydraulically Interconnected Suspension In Vehicle Dynamics And Stability Control, Lifu Wang, Nong Zhang, Haiping Du

Faculty of Engineering and Information Sciences - Papers: Part A

Mainly motivated by developing cost-effective vehicle anti-roll systems, hydraulically interconnected suspension has been studied in the past decade to replace anti-roll bars. It has been proved theoretically and practically that hydraulic suspensions have superior anti-roll ability over anti-roll bars, and therefore they have achieved commercial success in racing cars and luxury sports utility vehicles (SUVs). However, since vehicle is a highly coupled complex system, it is necessary to investigate/evaluate the hydraulic-suspension-fitted-vehicle's dynamic performance in other aspects, apart from anti-roll ability, such as ride comfort, lateral stability, etc. This paper presents an experimental investigation of a SUV fitted with a hydraulically …

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Virtual Worlds And Health: Healthcare Delivery And Simulation Opportunities, David Holloway Jan 2012

Virtual Worlds And Health: Healthcare Delivery And Simulation Opportunities, David Holloway

Faculty of Engineering and Information Sciences - Papers: Part A

With decades of experience in simulation, the health professions are comparatively well versed in virtual environments for training. More broadly, there is a growing body of experience and supporting evidence on the benefits of virtual worlds for professional information sharing, clinical simulation, healthcare delivery, and as a research tool. Virtual worlds have empirically demonstrated outcomes as a simulation tool that increases knowledge and of health professionals, and initial explorations in regard to healthcare delivery show promise. Key challenges for wider adoption of virtual worlds within the health professions include a lack of established standards around privacy, a fragmented approach to …

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Key-Based Scrambling For Secure Image Communication, Prashan Premaratne, Malin Premaratne Jan 2012

Key-Based Scrambling For Secure Image Communication, Prashan Premaratne, Malin Premaratne

Faculty of Engineering and Information Sciences - Papers: Part A

Secure image communication is becoming increasingly important due to theft and manipulation of its content. Law enforcement agents may find it increasingly difficult to stay afloat above the ill intentions of hackers. We have been able to develop an image scrambling algorithm that is very simple to implement but almost impossible to breach with a probability less than 5x10− 300. This is possible due to the fact that a user may purchase or acquire rights for an intended image by specifying a 'key' that can form a sequence of numbers 10 to 100 in length. The content provider uses this …

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X-Tream: A Novel Dosimetry System For Synchrotron Microbeam Radiation Therapy, M Petasecca, A Cullen, I Fuduli, A Espinoza, C Porumb, C Stanton, A H. Aldosari, E Brauer-Krisch, H Requardt, A Bravin, V Perevertaylo, Anatoly B. Rosenfeld, M L. F Lerch Jan 2012

X-Tream: A Novel Dosimetry System For Synchrotron Microbeam Radiation Therapy, M Petasecca, A Cullen, I Fuduli, A Espinoza, C Porumb, C Stanton, A H. Aldosari, E Brauer-Krisch, H Requardt, A Bravin, V Perevertaylo, Anatoly B. Rosenfeld, M L. F Lerch

Faculty of Engineering and Information Sciences - Papers: Part A

Microbeam Radiation Therapy (MRT) is a radiation treatment technique under development for inoperable brain tumors. MRT is based on the use of a synchrotron generated X-ray beam with an extremely high dose rate ( ~ 20 kGy/sec), striated into an array of X-ray micro-blades. In order to advance to clinical trials, a real-time dosimeter with excellent spatial resolution must be developed for absolute dosimetry. The design of a real-time dosimeter for such a radiation scenario represents a significant challenge due to the high photon flux and vertically striated radiation field, leading to very steep lateral dose gradients. This article analyses …

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The Dynamics Of A Rising Pivoted Cylinder, B Stappenbelt, J Neville, B Murdoch, A Johnstone Jan 2012

The Dynamics Of A Rising Pivoted Cylinder, B Stappenbelt, J Neville, B Murdoch, A Johnstone

Faculty of Engineering and Information Sciences - Papers: Part A

The existence of a critical mass ratio for cylinders undergoing vortex-induced vibration (VIV) in a translational system has been well established. Below this critical point, the reduced velocity at VIV lock-out tends to infinity. It has been surmised that a corresponding mass moment of inertia ratio must exist for a pivoted cylinder arrangement. To the authors' knowledge there has been no investigation published substantiating this premise. The aim of the present investigation then was to examine the critical point for cylinders in a rotational system. The approach adopted involved measuring the VIV amplitude response of a positively buoyant, and hence …

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Ethics In Engineering: Student Perceptions And Their Professional Identity Development, Brad Stappenbelt Jan 2012

Ethics In Engineering: Student Perceptions And Their Professional Identity Development, Brad Stappenbelt

Faculty of Engineering and Information Sciences - Papers: Part A

Professional ethics instruction in engineering is commonly conducted by examining case studies in light of the code of conduct of a suitable professional body. Although graphical presentations of spectacular failures, sobering stories of the repercussions and the solid framework provided by the tenets of a code of ethics may leave a lasting impression, students generally gain their professional identity from relatives and colleagues. Their professional ethics tend to be mostly an extension of their personal ethics. Instruction on ethics generally serves only to reinforce students' inclination to act ethically and provides encouragement to act on these beliefs. In this study …

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Wireless Indoor Localisation Using Received Signal Strength Fingerprinting With Context Aware Partitioning, Montserrat Ros, Brendan Schoots, Matthew D'Souza Jan 2012

Wireless Indoor Localisation Using Received Signal Strength Fingerprinting With Context Aware Partitioning, Montserrat Ros, Brendan Schoots, Matthew D'Souza

Faculty of Engineering and Information Sciences - Papers: Part A

Real-time indoor localisation tracking of people with unobtrusive, wearable sensors has valuable potential for a variety of applications such as remote monitoring and tracking of aged-care patients to improve their safety and other care aspects. There are no widely available or costeffective and ubiquitous wireless solutions like GPS for indoor localisation which require no prior infrastructure. Indoor localisation systems are available but most have difficulties operating in confined spaces or cannot localise to within small distances in real-time for moving objects as required for sport and health applications.

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A Framework For Inter-Organizational Knowledge Sharing: Managerial Influences, Rosemary A. Van Der Meer, Luba Torlina Jan 2012

A Framework For Inter-Organizational Knowledge Sharing: Managerial Influences, Rosemary A. Van Der Meer, Luba Torlina

Faculty of Engineering and Information Sciences - Papers: Part A

The purpose of this paper is to determine whether an existing organizational knowledge management framework could be utilized in an inter-organizational domain. We selected the threefold KM framework developed by Holsapple and Joshi (2000; 2002). This framework has been well tested and provides clearly defined elements to examine the influences on knowledge management and knowledge sharing in an organizational context. We report the results of testing the framework in three inter-organizational case studies and propose some adaptations to the managerial influences for inter-organizational analysis.

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Robust Designs For Poisson Regression Models, J M. Mcgree, J A. Eccleston Jan 2012

Robust Designs For Poisson Regression Models, J M. Mcgree, J A. Eccleston

Faculty of Engineering and Information Sciences - Papers: Part A

We consider the problem of how to construct robust designs for Poisson regression models. An analytical expression is derived for robust designs for first-order Poisson regression models where uncertainty exists in the prior parameter estimates. Given cer- tain constraints in the methodology, it may be necessary to extend the robust designs for implementation in practical experiments. With these extensions, our methodology con- structs designs which perform similarly, in terms of estimation, to current techniques, and offers the solution in a more timely manner. We further apply this analytic result to cases where uncertainty exists in the linear predictor. The application …

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Parameter Estimation Of A Regime-Switching Model Using An Inverse Stieltjes Moment Approach, X Xi, Marianito R. Rodrigo, Rogemar S. Mamon Jan 2012

Parameter Estimation Of A Regime-Switching Model Using An Inverse Stieltjes Moment Approach, X Xi, Marianito R. Rodrigo, Rogemar S. Mamon

Faculty of Engineering and Information Sciences - Papers: Part A

We address the problem of recovering the time-dependent parameters of the Black-Scholes option pricing model when the underlying stock price dynamics are modelled by a finite-state, continuous-time Markov chain. The coupled system of Dupire-type partial differential equations is derived and formulated as an inverse Stieltjes moment problem. We provide numerical illustration on how to apply our method to simulated financial data. The accuracy of the model parameter estimation is examined and sensitivity analyses are included to study the behaviour of the estimated results when model parameters are varied.

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Finite Element Analysis Of Consolidation Behavior Of Composite Soft Ground, S Horpibulsuk, A Chinkulkijniwat, A Cholaphatsron, J Suebsuk, M D. Liu Jan 2012

Finite Element Analysis Of Consolidation Behavior Of Composite Soft Ground, S Horpibulsuk, A Chinkulkijniwat, A Cholaphatsron, J Suebsuk, M D. Liu

Faculty of Engineering and Information Sciences - Papers: Part A

Columnar inclusion is one of the effective and widely used methods for improving engineering properties of soft clay ground. This paper investigates the consolidation behavior of composite soft clay ground using both physical model tests under an axial-symmetry condition and finite element simulations using the PLAXIS 2D program. Because the soil-cement column enhances the yield stress and stiffness of the composite ground, the composite ground is in an over-consolidated state under the applied vertical applied stresses. At this state, the rate of consolidation is rapid due to a high coefficient of consolidation. The consolidation of the composite ground is mainly …

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Comparison Of 16 Mm Osu-Nag And Coms Eye Plaques, Hualin Zhang, Frederick Davidorf, Yujin Qi Jan 2012

Comparison Of 16 Mm Osu-Nag And Coms Eye Plaques, Hualin Zhang, Frederick Davidorf, Yujin Qi

Faculty of Engineering and Information Sciences - Papers: Part A

OSU-NAG eye plaques use fewer sources than COMS-plaques of comparable size, and do not employ a Silastic seed carrier insert. Monte Carlo modeling was used to calculate 3D dose distributions for a 16 mm OSU-NAG eye plaque and a 16 mm COMS eye plaque loaded with either Iodine-125 or Cesium-131 brachytherapy sources. The OSU-NAG eye plaque was loaded with eight sources forming two squares, whereas the COMS eye plaque was loaded with thirteen sources approximating three isocentric circles. A spherical eyeball 24.6 mm in diameter and an ellipsoid-like tumor 6 mm in height and 12 mm in the major and …

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Experimental Study On Chain-Die Forming For Ultrahigh Strength Steel (Uhss), Yuankun Zhang, Shichao Ding Jan 2012

Experimental Study On Chain-Die Forming For Ultrahigh Strength Steel (Uhss), Yuankun Zhang, Shichao Ding

Faculty of Engineering and Information Sciences - Papers: Part A

With the increasing applications of UHSS for the automotive industry, it becomes more and more important to develop a new forming technology as an alternative or even a replacement to roll forming to overcome the difficulties and problems of manufacturing the UHSS. With the increase of material's strength and decrease of its thickness, the springback of the material becomes more difficult to predict, which directly affects the application of roll forming in UHSS. Chain-die Forming, as an alternative to roll forming proposed and developed recently in Australia, is expected to be a solution to the problems addressed. It has been …

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Estimation Of Regression Parameters From Noise Multiplied Data, Yan-Xia Lin, Phillip Wise Jan 2012

Estimation Of Regression Parameters From Noise Multiplied Data, Yan-Xia Lin, Phillip Wise

Faculty of Engineering and Information Sciences - Papers: Part A

This paper considers the scenario that all data entries in a confidentialised unit record file were masked by multiplicative noises, regardless of whether unit records are sensitive or not and regardless of whether the masked variables are dependent or independent variables in the underlying regression analysis. A technique is introduced in this paper to show how to estimate parameters in a regression model, which is originally fitted by unmasked data, based on masked data. Several simulation studies and a real-life data application are presented.

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Drying Shrinkage Of Concrete Made From Recycled Concrete Aggregate, B A. Whiting, T J. Mccarthy, E Lume Jan 2012

Drying Shrinkage Of Concrete Made From Recycled Concrete Aggregate, B A. Whiting, T J. Mccarthy, E Lume

Faculty of Engineering and Information Sciences - Papers: Part A

Recycled concrete aggregates (RCA) are used in new concrete mixes, termed recycled aggregate concrete (RAC). Among losses in most fresh and hardened properties, literature reports that RAC suffers increased levels of drying shrinkage compared to equivalent mixes incorporating conventional aggregates. This paper describes the procedure and results of a range of experiments conducted on a commercial RCA and its use in new concrete mixes. In particular, this work quantifies the effect 100% RCA has on the drying shrinkage of the resulting concrete. A commercially available RCA was characterised by analysing the particle shape and texture, percentage of solid contaminants, particle …

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Effect Of Manganese Content And Microstructure On The Susceptibility Of X70 Pipeline Steel To Hydrogen Cracking, D Hejazi, A J. Haq, N Yazdipour, D P. Dunne, A Calka, Frank J. Barbaro, E V. Pereloma Jan 2012

Effect Of Manganese Content And Microstructure On The Susceptibility Of X70 Pipeline Steel To Hydrogen Cracking, D Hejazi, A J. Haq, N Yazdipour, D P. Dunne, A Calka, Frank J. Barbaro, E V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part A

The influence of composition and microstructure on susceptibility to hydrogen induced cracking (HIC) was investigated in high strength pipeline steels, with Mn contents of 1.2% (standard, X70), and 0.5% (medium, MX70). The HIC resistance of the simulated coarse grained heat affected zone microstructures and normalized X70 transfer bar was also investigated. Notched and fatigue pre-cracked samples were charged with hydrogen prior to three point bend tests. The conditional fracture toughness JQ was determined. The results are discussed in relation to grain size, microstructure, composition and the type and distribution of non-metallic inclusions and precipitates.

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