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Articles 1381 - 1410 of 2936
Full-Text Articles in Social and Behavioral Sciences
Performance Enhancement Of Bridges And Other Structures Through The Use Of Fibre-Reinforced Polymer (Frp) Composites: Some Recent Hong Kong Research, J G. Teng, S S. Zhang, Q G. Xiao, D Fernando, B Zhang
Performance Enhancement Of Bridges And Other Structures Through The Use Of Fibre-Reinforced Polymer (Frp) Composites: Some Recent Hong Kong Research, J G. Teng, S S. Zhang, Q G. Xiao, D Fernando, B Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
Due to their various advantages including excellent corrosion resistance and high strength-toweight ratios, fibre-reinforced polymer (FRP) composites have been widely used as strengthening materials to enhance the performance of existing structures including bridges. In addition, FRP composites have attracted increasing attention for use in the construction of high-performance bridges and other structures. This paper presents a summary of some recent research undertaken atThe HongKong Polytechnic University (PolyU) in both areas. The paper covers the following topics of significant current interest examined in four recent PhD projects under the supervision of the first author: (1) strengthening of reinforced concrete (RC) beams …
Bond Strength Model For Interfaces Between Near-Surface Mounted (Nsm) Cfrp Strips And Concrete, S S. Zhang, J G. Teng, T Yu
Bond Strength Model For Interfaces Between Near-Surface Mounted (Nsm) Cfrp Strips And Concrete, S S. Zhang, J G. Teng, T Yu
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents an accurate bond strength model for carbon-fibre-reinforced polymer (CFRP) strips near-surface mounted (NSM) to concrete where debonding failure happens in the concrete layer adjacent to the interface between FRP and concrete. Both bonded joints with a sufficient bond length and those with an insufficient bond length are covered by the proposed model. The bond strength model was developed on the basis of an existing analytical solution as well as a recently proposed bond-slip model for such bonded joints. Numerical comparisons between the proposed bond strength model and 51 test specimens collected from the existing experimental studies as …
Towards Energy-Aware Optimisation Of Business Processes, Beatriz Lopez, Aditya Ghose, Tony Savarimuthu, Mariusz Nowostawski, Michael Winikoff, Stephen Cranefield
Towards Energy-Aware Optimisation Of Business Processes, Beatriz Lopez, Aditya Ghose, Tony Savarimuthu, Mariusz Nowostawski, Michael Winikoff, Stephen Cranefield
Faculty of Engineering and Information Sciences - Papers: Part A
Time dependent energy tariffs are a matter of concern to managers in organisations, who need to rethink how to allocate resources to business processes so that they take into account energy costs. However, due to the time-dependent costs, the resource optimisation problem needs to be redesigned. In this paper we formalise the energy-aware resource allocation problem, including time-dependent variable costs; and present a case study in which an auction mechanism is used to find a solution. Our results show how the choice of cost (energy, monetary, or duration) affects the schedules obtained.
A Systematic Review Of Bio-Inspired Service Concretization, Lijuan Wang, Jun Shen
A Systematic Review Of Bio-Inspired Service Concretization, Lijuan Wang, Jun Shen
Faculty of Engineering and Information Sciences - Papers: Part A
In service oriented computing, Web service selection is an important part of Web service composition. The Web service composition is achieved by solving the Web service concretization problem. The literature presents two types of Web service concretization approaches: local optimization approaches and global optimization approaches. There are three types of algorithmic methods in the global optimization approaches: optimal methods, sub-optimal methods, and soft constraints-based methods. The bio-inspired algorithms are sub-optimal methods. This paper will firstly present a hierarchical taxonomy of Web service concretization approaches. Then we conduct a systematic review on the current research of Web service concretization based on …
Use Of A Large Multiparent Wheat Mapping Population In Genomic Dissection Of Coleoptile And Seedling Growth, Greg J. Rebetzke, Arunas P. Verbyla, Klara L. Verbyla, Matthew K. Morell, Colin R. Cavanagh
Use Of A Large Multiparent Wheat Mapping Population In Genomic Dissection Of Coleoptile And Seedling Growth, Greg J. Rebetzke, Arunas P. Verbyla, Klara L. Verbyla, Matthew K. Morell, Colin R. Cavanagh
Faculty of Engineering and Information Sciences - Papers: Part A
Identification of alleles towards the selection for improved seedling vigour is a key objective of many wheat breeding programmes. A multiparent advanced generation intercross (MAGIC) population developed from four commercial spring wheat cultivars (cvv. Baxter, Chara, Westonia and Yitpi) and containing ca. 1000 F2-derived, F6:7 RILs was assessed at two contrasting soil temperatures (12 and 20 °C) for shoot length and coleoptile characteristics length and thickness. Narrow-sense heritabilities were high for coleoptile and shoot length (h2 = 0.68-0.70), indicating a strong genetic basis for the differences among progeny. Genotypic variation was large, and distributions of genotype means were approximately Gaussian …
Evaluating The Influence Of Virtual Reality-Based Training On Workers' Competencies In The Mining Industry, Shiva Pedram, Pascal Perez, Stephen Palmisano
Evaluating The Influence Of Virtual Reality-Based Training On Workers' Competencies In The Mining Industry, Shiva Pedram, Pascal Perez, Stephen Palmisano
Faculty of Engineering and Information Sciences - Papers: Part A
The Australian mining industry has achieved remarkable performance and safety results through continuous improvement of its training standards. Interactive virtual reality-based training is the most recent technology used to enhance workers' competencies in a safe and controlled environment that allows for replicable testing of extreme event scenarios. Like any other training method, VR-based training needs to be assessed in order to evaluate the advantages and limitations of this innovative technology, compared with more traditional approaches. Our research aims to design and implement an evaluation framework that can be used to assess VR-based training programs developed, amongst other training methods, by …
A Coastal Groundwater Management Model With Indian Case Study, Sudip Basack, Amartya Kumar Bhattacharya, Prabir Maity
A Coastal Groundwater Management Model With Indian Case Study, Sudip Basack, Amartya Kumar Bhattacharya, Prabir Maity
Faculty of Engineering and Information Sciences - Papers: Part A
The complexity of the hydrogeological setup in coastal areas calls for the adoption of scientific groundwater management techniques. Excessive withdrawal of groundwater in coastal zones will lead to depression of the water table, with associated hazards such as putting the well out of use, rendering abstraction uneconomic with increased lift. A sustained regional groundwater drawdown below sea level runs the risk of saline water intrusion, even for confined coastal aquifers. Uncontrolled groundwater development may lead to reversal of the freshwater gradient, thereby resulting in saline water ingress into coastal aquifers. There are, however, several established methodologies to control and minimise …
Government Interactions With Citizens On Youtube To Solve Government Transparency Problems, Akemi T. Chatfield, Christopher Reddick
Government Interactions With Citizens On Youtube To Solve Government Transparency Problems, Akemi T. Chatfield, Christopher Reddick
Faculty of Engineering and Information Sciences - Papers: Part A
Abstract of a presentation.
Encoding High Dimensional Local Features By Sparse Coding Based Fisher Vectors, Lingqiao Liu, Chunhua Shen, Lei Wang, Anton Van Den Hengel, Chao Wang
Encoding High Dimensional Local Features By Sparse Coding Based Fisher Vectors, Lingqiao Liu, Chunhua Shen, Lei Wang, Anton Van Den Hengel, Chao Wang
Faculty of Engineering and Information Sciences - Papers: Part A
Deriving from the gradient vector of a generative model of local features, Fisher vector coding (FVC) has been identified as an effective coding method for image classification. Most, if not all, FVC implementations employ the Gaussian mixture model (GMM) to characterize the generation process of local features. This choice has shown to be sufficient for traditional low dimensional local features, e.g., SIFT; and typically, good performance can be achieved with only a few hundred Gaussian distributions. However, the same number of Gaussians is insufficient to model the feature space spanned by higher dimensional local features, which have become popular recently. …
Kms States On C*-Algebras Associated To Higher-Rank Graphs, Astrid An Huef, Marcelo Laca, Iain Raeburn, Aidan Sims
Kms States On C*-Algebras Associated To Higher-Rank Graphs, Astrid An Huef, Marcelo Laca, Iain Raeburn, Aidan Sims
Faculty of Engineering and Information Sciences - Papers: Part A
Consider a higher rank graph of rank k. Both the Cuntz-Krieger algebra and Toeplitz-Cuntz-Krieger algebra of the graph carry natural gauge actions of the torus Tk, and restricting these guage actions to one parameter subgroups of Tk gives dynamical systems involving actions of the real line. We study the KMS states of these dynamical systems. We find that for large inverse temperatures B, the simplex of KMS B states of the Toeplitz-Cuntz-Krieger algebra has dimension d one less than the number of vertices in the graph. We also show that there is a preferred dynamics for which there is a …
The Path Space Of A Directed Graph, Samuel B. G Webster
The Path Space Of A Directed Graph, Samuel B. G Webster
Faculty of Engineering and Information Sciences - Papers: Part A
We construct a locally compact Hausdorff topology on the path space of a directed graph E and identify its boundary-path space ∂E as the spectrum of a commutative C*-subalgebra DE of C*(E). We then show that ∂E is homeomorphic to a subset of the infinite-path space of any desingularisation F of E. Drinen and Tomforde showed that we can realise C*(E) as a full corner of C*(F), and we deduce that DE is isomorphic to a corner of DF. Lastly, we show that this isomorphism implements the homeomorphism between the boundary-path spaces.
Dem Simulation Of The Behaviour Of Geogrid Stabilised Ballast Fouled With Coal, Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Dem Simulation Of The Behaviour Of Geogrid Stabilised Ballast Fouled With Coal, Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Faculty of Engineering and Information Sciences - Papers: Part A
Geogrids are commonly used in railway construction for reinforcement and stabilisation. When railway ballast becomes fouled due to ballast breakage, infiltration of coal fines, dust and subgrade soil pumping, the reinforcement effect of geogrids decreases significantly. This paper presents results obtained from Discrete Element Method (DEM) to study the interface behaviour of coal-fouled ballast reinforced by geogrid subjected to direct shear testing. In this study, irregularly-shaped aggregates (ballast) were modelled by clumping together 10-20 spheres in appropriate sizes and positions. The geogrid was modelled by bonding a large number of small spheres together to form the desired grid geometry and …
Smart Home Electricity Management In The Context Of Local Power Resources And Smart Grid, Weiliang Zhao, Lan Ding, Paul Cooper, Pascal Perez
Smart Home Electricity Management In The Context Of Local Power Resources And Smart Grid, Weiliang Zhao, Lan Ding, Paul Cooper, Pascal Perez
Faculty of Engineering and Information Sciences - Papers: Part A
This work proposes a smart home electricity management approach that can predict and schedule electricity demand and supply by considering: the 'state' of the smart grid, local power generation capacity, and electrical consumption of household appliances. The prediction of weather conditions and the immediate and longer-term plans of the residential home occupants are crucial parameters in the smart home decision-making system that acts on behalf of the occupants. This paper provides a motivation example and associated scenarios, electrical energy supply/demand models, formalization of the cost optimization problem, and scheduling schemes for a smart home electricity management system in the context …
Improvements On An Authentication Scheme For Vehicular Sensor Networks, Joseph K. Liu, Tsz Hon Yuen, Man Ho Au, Willy Susilo
Improvements On An Authentication Scheme For Vehicular Sensor Networks, Joseph K. Liu, Tsz Hon Yuen, Man Ho Au, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part A
In a recent paper, Shim (2012) presented a very interesting authentication scheme for vehicular sensor networks. Shim claimed that the scheme is secure against the highest adopted level of attack, namely the chosen-message attack (CID-CMA). Nevertheless, we find that the proof in Shim's paper does not actually prove that the scheme is secure in this level. Instead, it can only ensure that the scheme is secure in a strictly weaker level of attack, the adaptive chosen-identity and no-message attack (CID-NMA). In this paper, first we show that there exist some security risks in vehicular networks if a scheme, which is …
Development And Validation Of A Disaster Management Metamodel (Dmm), Siti Hajar Othman, Ghassan Beydoun, Vijayan Sugumaran
Development And Validation Of A Disaster Management Metamodel (Dmm), Siti Hajar Othman, Ghassan Beydoun, Vijayan Sugumaran
Faculty of Engineering and Information Sciences - Papers: Part A
Disaster Management (DM) is a diffused area of knowledge. It has many complex features interconnecting the physical and the social views of the world. Many international and national bodies create knowledge models to allow knowledge sharing and effective DM activities. But these are often narrow in focus and deal with specified disaster types. We analyze thirty such models to uncover that many DM activities are actually common even when the events vary. We then create a unified view of DM in the form of a metamodel. We apply a metamodelling process to ensure that this metamodel is complete and consistent. …
Global Intermodal Liner Shipping Network Design, Zhiyuan Liu, Qiang Meng, Shuaian Wang, Zhuo Sun
Global Intermodal Liner Shipping Network Design, Zhiyuan Liu, Qiang Meng, Shuaian Wang, Zhuo Sun
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a holistic analysis for the network design problem of the intermodal liner shipping system. Existing methods for liner shipping network design mainly deal with port-to-port demand. However, most of the demand has inland origins and/or destinations. Thus, it is necessary to cope with inland origin-destination (OD) pairs involving a change in transport mode from inland transportation to maritime shipping. A method is first proposed to convert inland OD demand to port-to-port demand. Then, a framework for global intermodal liner shipping network design is proposed. Finally, the proposed methodology is applied to and numerically verified by a large-scale …
Security Pitfalls Of An Efficient Threshold Proxy Signature Scheme For Mobile Agents, Yong Yu, Yi Mu, Willy Susilo, Man Ho Au
Security Pitfalls Of An Efficient Threshold Proxy Signature Scheme For Mobile Agents, Yong Yu, Yi Mu, Willy Susilo, Man Ho Au
Faculty of Engineering and Information Sciences - Papers: Part A
A (t,n) threashold proxy signature scheme enables an original signer to delegate his/her signing power to n proxy signers such that any t or more proxy signers can sign messages on behalf of the original signer, but t-1 or less of them cannot produce a valid proxy signature. Based on the RSA cryptosystem, Hong proposed an efficient (t,n) threshold proxy signature for mobile agents. Cai et al. found that the scheme due to Hong is proxy-unprotected , meaning that the original signer can generate a valid proxy signature by himself. However, it is unclear whether the scheme can be used …
A New Quaternary Phase Observed In A Laser Treated Zn-Al-Mg-Si Coating, Z Chen, C.-T Peng, Q Liu, R Smith, D Nolan
A New Quaternary Phase Observed In A Laser Treated Zn-Al-Mg-Si Coating, Z Chen, C.-T Peng, Q Liu, R Smith, D Nolan
Faculty of Engineering and Information Sciences - Papers: Part A
The microstructure of laser resurfaced Zn-55Al-2Mg-1.5Si coating produced on a hot-dip simulator was characterised by transmission electron microscopy. A new quaternary phase was observed and its crystal structure was determined by electron diffraction.
Rejection And Fate Of Trace Organic Compounds (Trocs) During Membrane Distillation, Kaushalya Wijekoon, Faisal Ibney Hai, Jinguo Kang, William E. Price, Tzahi Cath, Long D. Nghiem
Rejection And Fate Of Trace Organic Compounds (Trocs) During Membrane Distillation, Kaushalya Wijekoon, Faisal Ibney Hai, Jinguo Kang, William E. Price, Tzahi Cath, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
In this study, we examined the feasibility of membrane distillation (MD) for removing trace organic compounds (TrOCs) during water and wastewater treatment. A set of 29 compounds was selected to represent major TrOC groups, including pharmaceuticals, steroid hormones, phytoestrogens, UV-filters, industrial chemicals, and pesticides that occur ubiquitously in municipal wastewater. Results reported here suggest that rejection and fate and transport of TrOC during MD are governed by their volatility and, to a lesser extent, hydrophobicity. All TrOCs with pKH > 9 (which can be classified as non-volatile) were well removed by MD. Among the 29 TrOCs investigated in this study, three …
Small Field In-Air Output Factors: The Role Of Miniphantom Design And Dosimeter Type, Kirbie Warrener, Benjamin Hug, Paul Liu, Anna Ralston, Martin A. Ebert, David Mckenzie, Natalka Suchowerska
Small Field In-Air Output Factors: The Role Of Miniphantom Design And Dosimeter Type, Kirbie Warrener, Benjamin Hug, Paul Liu, Anna Ralston, Martin A. Ebert, David Mckenzie, Natalka Suchowerska
Faculty of Engineering and Information Sciences - Papers: Part A
The commissioning of treatment planning systems and beam modeling requires measured input parameters. The measurement of relative output in-air, Sc is particularly difficult for small fields. The purpose of this study was to investigate the influence of miniphantom design and detector selection on measured Sc values for small fields and to validate the measurements against Monte Carlo simulations. Measurements were performed using brass caps (with sidewalls) or tops (no sidewalls) of varying heights and widths. The performance of two unshielded diodes (60012 and SFD), EBT2 radiochromic film, and a fiber optic dosimeter (FOD) were compared for fields defined by MLCs …
Outlier Robust Small Area Estimation, Ray Chambers, Hukum Chandra, Nicola Salvati, Nikos Tzavidis
Outlier Robust Small Area Estimation, Ray Chambers, Hukum Chandra, Nicola Salvati, Nikos Tzavidis
Faculty of Engineering and Information Sciences - Papers: Part A
Recently proposed outlier robust small area estimators can be substantially biased when outliers are drawn from a distribution that has a different mean from that of the rest of the survey data. This naturally leads one to consider an outlier robust bias correction for these estimators. We develop this idea, proposing two different analytical mean-squared error estimators for the ensuing bias-corrected outlier robust estimators. Simulations based on realistic outlier-contaminated data show that the bias correction proposed often leads to more efficient estimators. Furthermore, the mean-squared error estimation methods proposed appear to perform well with a variety of outlier robust small …
Modeling And Inverse Feedforward Control For Conducting Polymer Actuators With Hysteresis, Xiangjiang Wang, Gursel Alici, Xiaobo Tan
Modeling And Inverse Feedforward Control For Conducting Polymer Actuators With Hysteresis, Xiangjiang Wang, Gursel Alici, Xiaobo Tan
Faculty of Engineering and Information Sciences - Papers: Part A
Conducting polymer actuators are biocompatible with a small footprint, and operate in air or liquid media under low actuation voltages. This makes them excellent actuators for macro- and micro-manipulation devices, however, their positioning ability or accuracy is adversely affected by their hysteresis non-linearity under open-loop control strategies. In this paper, we establish a hysteresis model for conducting polymer actuators, based on a rate-independent hysteresis model known as the Duhem model. The hysteresis model is experimentally identified and integrated with the linear dynamics of the actuator. This combined model is inverted to control the displacement of the tri-layer actuators considered in …
Performance Assessment Of Reinforced Ballasted Rail Track, Buddhima Indraratna, Sanjay Nimbalkar, Tim Neville
Performance Assessment Of Reinforced Ballasted Rail Track, Buddhima Indraratna, Sanjay Nimbalkar, Tim Neville
Faculty of Engineering and Information Sciences - Papers: Part A
In coastal Australia, high population density and increased traffic volumes have promoted rapid expansion of urban transportation infrastructure including railways. Coastal soft clays pose significant construction challenges. Therefore, the search for innovative ground improvement techniques imperative for more resilient and sustainable transport infrastructure has become an obvious priority in research and development. Use of artificial inclusions such as polymeric geosynthetics and energy-absorbing shock mats is described in this paper as a suitable alternative for reducing unacceptable track degradation and for ensuring sustainable track alignment. An extensive monitoring programme was undertaken on fully instrumented track sections constructed near Singleton, New South …
A Critical Systematic Review Of Service Concretization Based On Bio-Inspired Approaches, Lijuan Wang, Jun Shen
A Critical Systematic Review Of Service Concretization Based On Bio-Inspired Approaches, Lijuan Wang, Jun Shen
Faculty of Engineering and Information Sciences - Papers: Part A
In service-oriented computing, Web service selection is an important part of Web service composition. QoS attributes are used to distinguish Web services with same functionality. QoS-aware Web service selection and composition have attracted much attention in the past years. The Web service composition is achieved by solving the Web service concretization problem. The literature has presented two Web service concretization approaches, namely, local optimization approach and global optimization approach. There are three types of algorithmic methods in the global optimization approaches: optimal methods, sub-optimal methods, and soft constraints-based methods. The bio-inspired algorithms are sub-optimal methods. The existing studies using bio-inspired …
Chiral-Like Tunneling Of Electrons In Two-Dimensional Semiconductors With Rashba Spin-Orbit Coupling, Yee Sin Ang, Zhongshui Ma, C Zhang
Chiral-Like Tunneling Of Electrons In Two-Dimensional Semiconductors With Rashba Spin-Orbit Coupling, Yee Sin Ang, Zhongshui Ma, C Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
The unusual tunneling effects of massless chiral fermions (mCF) and massive chiral fermions (MCF) in a single layer graphene and bilayer graphene represent some of the most bizarre quantum transport phenomena in condensed matter system. Here we show that in a two-dimensional semiconductor with Rashba spin-orbit coupling (R2DEG), the real-spin chiral-like tunneling of electrons at normal incidence simultaneously exhibits features of mCF and MCF. The parabolic branch of opposite spin in R2DEG crosses at a Dirac-like point and has a band turning point. These features generate transport properties not found in usual two-dimensional electron gas. Albeit its p Berry phase, …
A New Payment System For Enhancing Location Privacy Of Electric Vehicles, Man Ho Au, Joseph K. Liu, Junbin Fang, Zoe L. Jiang, Willy Susilo, Jianying Zhou
A New Payment System For Enhancing Location Privacy Of Electric Vehicles, Man Ho Au, Joseph K. Liu, Junbin Fang, Zoe L. Jiang, Willy Susilo, Jianying Zhou
Faculty of Engineering and Information Sciences - Papers: Part A
An electric vehicle (EV) is a promising and futuristic automobile propelled by electric motors, using electrical energy stored in batteries or another energy storage device. Due to the need for the battery to be recharged, the cars will be required to visit a recharging infrastructure very frequently. This may disclose the users' private information, such as their location and, thus, compromise users' privacy. In this paper, we propose a new payment system that is suitable for EVs. Our system not only supports privacy protection (location privacy) but supports traceability in the case where the cars are stolen as well. Our …
Solitary Waves In Nematic Liquid Crystals, Panayotis Panayotaros, T R. Marchant
Solitary Waves In Nematic Liquid Crystals, Panayotis Panayotaros, T R. Marchant
Faculty of Engineering and Information Sciences - Papers: Part A
We study soliton solutions of a two-dimensional nonlocal NLS equation of Hartree-type with a Bessel potential kernel. The equation models laser propagation in nematic liquid crystals. Motivated by the experimental observation of spatially localized beams, see Conti et al. (2003), we show existence, stability, regularity, and radial symmetry of energy minimizing soliton solutions in R2. We also give theoretical lower bounds for the L2-norm (power) of these solitons, and show that small L2 -norm initial conditions lead to decaying solutions. We also present numerical computations of radial soliton solutions. These solutions exhibit the properties expected by the infinite plane theory, …
P2ofe: Privacy-Preserving Optimistic Fair Exchange Of Digital Signatures, Qiong Huang, Duncan S. Wong, Willy Susilo
P2ofe: Privacy-Preserving Optimistic Fair Exchange Of Digital Signatures, Qiong Huang, Duncan S. Wong, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part A
How to sign an electronic contract online between two parties (say Alice and Bob) in a fair manner is an interesting problem, and has been studied for a long time. Optimistic Fair Exchange (OFE) is an efficient solution to this problem, in which a semi-trusted third party named arbitrator is called in to resolve a dispute if there is one during an exchange between Alice and Bob. Recently, several extensions of OFE, such as Ambiguous OFE (AOFE) and Perfect AOFE (PAOFE), have been proposed to protect the privacy of the exchanging parties. These variants prevent any outsider including the arbitrator …
Numerical Modeling Of Size Effect In Micro Hydromechanical Deep Drawing, Hideki Sato, Ken-Ichi Manabe, Dongbin Wei, Zhengyi Jiang
Numerical Modeling Of Size Effect In Micro Hydromechanical Deep Drawing, Hideki Sato, Ken-Ichi Manabe, Dongbin Wei, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part A
A modeling of tribological size effects in micro deep drawing (MDD) and micro hydromechanical deep drawing (MHDD) is a main focus in this study. The inner and outer pockets in which the different friction coefficients can be applied at different lubrication conditions are considered on the blank surface. The ratio of the area of outer pockets to inner pockets is changed with the decrease in the size. The low friction coefficient at the outer pockets is assumed in MHDD by considering the lubrication effect of fluid medium. The numerical analysis is performed under six lubrication conditions. The analytical results of …
Geometrical And Fea Study On Millipede Forming, Lingran Kong, Di Tang, Shichao Ding, Yuankun Zhang
Geometrical And Fea Study On Millipede Forming, Lingran Kong, Di Tang, Shichao Ding, Yuankun Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
Millipede Forming is an innovative sheet metal forming approach that has been proposed and developed in Australia. U-channels, Z-channels or tubular products can be made by Millipede Forming. While a strip moves through an optimal transitional surface between the entry to exit of a forming stand, the redundant longitudinal membrane strain can be significantly reduced compared to the conventional roll forming, which is the essential principle to obtaining high quality products. The incremental forming process studied has demonstrated major advantages on space efficiency, power consumption and materials sensitivities. The purpose of this study is to investigate the effects of main …