Cyclic Transition Of Deformation In {1 2 3} <6 3 4> Single Crystal Processed By Accumulative Roll-Bonding,
2019
University of Wollongong
Cyclic Transition Of Deformation In {1 2 3} <6 3 4> Single Crystal Processed By Accumulative Roll-Bonding, Hui Wang, Cheng Lu, Anh Kiet Tieu
Faculty of Engineering and Information Sciences - Papers: Part B
In this study, the crystal plasticity finite element method model was used to study the deformation in a single crystal aluminium processed by accumulative roll-bonding (ARB). The predicted textures match well with the experimental observations up to nine cycles. The texture and slip activities in representative layers were investigated, and cyclic transition of them was observed. It was found that the thickness position change caused by cutting and stacking was a basic reason for the cyclic transition. Finally, the effect of shear deformation to this transition was discussed.
Improving Positioning Accuracy Of The Mobile Laser Scanning In Gps-Denied Environments: An Experimental Case Study,
2019
China University of Mining and Technology
Improving Positioning Accuracy Of The Mobile Laser Scanning In Gps-Denied Environments: An Experimental Case Study, W I. Liu, Zhixiong Li, Shuaishuai Sun, Reza Malekian, Zhenjun Ma, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part B
The positioning accuracy of the mobile laser scanning (MLS) system can reach the level of centimeter under the conditions where GPS works normally. However, in GPS-denied environments this accuracy can be reduced to the decimeter or even the meter level because the observation mode errors and the boresight alignment errors of MLS cannot be calibrated or corrected by the GPS signal. To bridge this research gap, this paper proposes a novel technique that appropriately incorporates the robust weight total least squares (RWTLS) and the full information maximum likelihood optimal estimation (FIMLOE) to improve the positioning accuracy of the MLS system …
Finite Element Analysis Of Forward Slip In Micro Flexible Rolling Of Thin Aluminium Strips,
2019
University of Wollongong
Finite Element Analysis Of Forward Slip In Micro Flexible Rolling Of Thin Aluminium Strips, Feijun Qu, Jianzhong Xu, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
This study delineates a novel finite element model to consider a pattern of process parameters affecting the forward slip in micro flexible rolling, which focuses on the thickness transition area of the rolled strip with thickness in the micrometre range. According to the strip marking method, the forward slip is obtained by comparison between the distance of the bumped ridges on the roll and that of the markings indented by the ridges, which not only simplifies the calculation process, but also maintains the accuracy as compared with theoretical estimates. The simulation results identify the qualitative and quantitative variations of forward …
Numerical And Experimental Studies On Wrinkling Control Methods Of Sheet Metal Part With High Curvature And Large Flange In Rubber Forming,
2019
University of Wollongong, Hangzhou Dianzi University
Numerical And Experimental Studies On Wrinkling Control Methods Of Sheet Metal Part With High Curvature And Large Flange In Rubber Forming, Lei Chen, Ying Bai, Zhengyi Jiang, Hui-Qin Chen, Can Wu, Qiaoyi Wang
Faculty of Engineering and Information Sciences - Papers: Part B
Wrinkling is one of the main failure modes in sheet metal forming process and may lead to assembly problems of the parts. Control of wrinkling is difficult due to the complex deformation behavior of the sheet metal. A finite element model for side blankholder method to control wrinkling was established and used for the simulation. Trials and simulations were conducted to analyze the parameters of wrinkling characteristics. Results show that with the increase in the angle of the side blankholder, the resistance force of the side blankholder decreases. The blank length on the side blankholder should be small enough. The …
Crystal Plasticity Modelling Of Microbands In A Rolled Aluminium Single Crystal,
2019
University of Wollongong, University of Tokyo
Crystal Plasticity Modelling Of Microbands In A Rolled Aluminium Single Crystal, Hui Wang, Cheng Lu, Anh Kiet Tieu
Faculty of Engineering and Information Sciences - Papers: Part B
In this study, an aluminium single crystal was deformed by roll-bonding, and the through-thickness texture and microstructure were characterized by electron backscattered diffraction (EBSD). Matrix bands and transition bands developed at the macro-scale, and microbands formed at the lower scale. Moreover, the crystal plasticity finite element method (CPFEM) was used to model the experimentally observed macro- and micro-subdivision. Matrix bands were captured in the Globalmodel that had a coarse mesh, and Submodel was adopted to predict microbands by refining the mesh. Two smaller regions of interest were selected from the Globalmodel and they were reconstructed in the Submodel. The Submodel …
A Nanomechanical Analysis Of Deformation Characteristics Of 6h-Sic Using An Indenter And Abrasives In Different Fixed Methods,
2019
Guangdong University of Technology, Guangdong Nanogrind Technology Ltd
A Nanomechanical Analysis Of Deformation Characteristics Of 6h-Sic Using An Indenter And Abrasives In Different Fixed Methods, Jisheng Pan, Qiusheng Yan, Weihua Li, Xiaowei Zhang
Faculty of Engineering and Information Sciences - Papers: Part B
The super-precise theory for machining single crystal SiC substrates with abrasives needs to be improved for its chemical stability, extremely hard and brittle. A Berkovich indenter was used to carry out a systematic static stiffness indentation experiments on single crystal 6H-SiC substrates, and then these substrates were machined by utilizing fixed, free, and semi-fixed abrasives, and the nanomechanical characteristics and material removal mechanisms using abrasives in different fixed methods were analyzed theoretically. The results indicated that the hardness of C faces and Si faces of single crystal 6H-SiC under 500 mN load were 38.596 Gpa and 36.246 Gpa respectively, and …
Polo-Like Kinase 1 Inhibitor Bi6727 Sensitizes 9l Gliosarcoma Cells To Ionizing Irradiation,
2019
University of Wollongong
Polo-Like Kinase 1 Inhibitor Bi6727 Sensitizes 9l Gliosarcoma Cells To Ionizing Irradiation, Nan Li, Elette Engels, Jeremy A. Davis, Andrew Dipuglia, Sarah Vogel, Michael Valceski, Anatoly B. Rosenfeld, Michael L. F Lerch, Stephanie Corde, Moeava Tehei
Faculty of Engineering and Information Sciences - Papers: Part B
Surgery, chemotherapy and radiotherapy remain as the major treatment strategies for cancers. Some agents such as anti-cancer drugs have capacity to enhance the radiation sensitivity of cancer cells at G2/M phase, leading to an improved radiotherapeutic efficacy. BI6727 is an ATP-competitive pololike kinase 1 (Plk 1)inhibitor and an anti-cancer drug. Using the radio-resistant 9L rat gliosarcoma cells as model, we examined the effect of BI6727 on cell growth and assessed the chemoradiotherapeutic efficiency between 150 kVp conventional irradiation (dose rate of 0.76 Gy min−1 ) and 66 keV synchrotron x-ray broad beam irradiation (dose rate of 46 Gy s−1). Our …
Full-Duplex Ofdm Relaying Systems With Energy Harvesting In Multipath Fading Channels,
2019
University of Wollongong
Full-Duplex Ofdm Relaying Systems With Energy Harvesting In Multipath Fading Channels, Jiaman Li, Le Chung Tran, Farzad Safaei
Faculty of Engineering and Information Sciences - Papers: Part B
In this paper, the performance of in-band fullduplex OFDM relaying systems with energy-harvesting and selfinterference cancellation in the polarization domain is analyzed. Specifically, we use the time switching-based relaying protocol to implement energy harvesting. The harvested energy is used by the relay to forward the transmitted information from the source. To cancel the self-interference, the polarization-enabled digital self-interference cancellation scheme is deployed at the relay. Our simulation results show that the full-duplex OFDM energy harvesting relaying system almost doubles the throughput, while maintaining the same bit error performance by a modest increase in the signal-to-noise ratio compared to the half-duplex …
Phase-Specific Properties In A Low-Alloyed Trip Steel Investigated Using Correlative Nanoindentation Measurements And Electron Microscopy,
2019
University of Science And Technology Beijing
Phase-Specific Properties In A Low-Alloyed Trip Steel Investigated Using Correlative Nanoindentation Measurements And Electron Microscopy, Zhiping Xiong, Ahmed A. Saleh, Gilberto Casillas, Shaogang Cui, Elena V. Pereloma
Faculty of Engineering and Information Sciences - Papers: Part B
Nanoindentation measurements of polygonal ferrite (PF), bainitic ferrite (BF) lath, ferrite in granular bainite (GB) and retained austenite (RA) in a low-alloyed multi-phase transformation-induced plasticity steel were carried out in conjunction with electron backscattering diffraction and scanning transmission electron microscopy (STEM). PF returned the lowest hardness followed by ferrite in GB, BF lath and RA. Dislocation glide and austenite-to-martensite transformation can be correlated with the first and second pop-in observed in the load-displacement curve, respectively. The martensite transformation induced by nanoindentation was demonstrated via correlative STEM. Film RA generally shows a higher stability than blocky RA, associated with a larger …
A Study On The Local Corrosion Behavior And Mechanism Of Electroless Ni-P Coatings Under Flow By Using A Wire Beam Electrode,
2019
Southwest Petroleum University
A Study On The Local Corrosion Behavior And Mechanism Of Electroless Ni-P Coatings Under Flow By Using A Wire Beam Electrode, Yi-Rong Tang, Qin-Ying Wang, Rui Pei, Yu-Chen Xi, Li-Jin Dong, Shu-Lin Bai, Shanhong Wan
Faculty of Engineering and Information Sciences - Papers: Part B
The local corrosion behavior and mechanism of Ni-P coatings in a 3.5 wt% sodium chloride solution with different flow speeds (0 m s-1, 0.5 m s-1, 1 m s-1) were investigated through a wire beam electrode (WBE) with morphological, elemental and electrochemical analyses as well as numerical simulations. It was found that the microstructure of the Ni-P coating was in the shape of broccoli and possessed satisfactory compactness and uniformity. The numerical simulations showed that the speed increased and the static pressure decreased at the local area. Combined with WBE, it was found that …
A Combination Of Keyhole Gtaw With A Trapezoidal Interlayer: A New Insight Into Armour Steel Welding,
2019
University of Wollongong, Defence Materials Technology Centre
A Combination Of Keyhole Gtaw With A Trapezoidal Interlayer: A New Insight Into Armour Steel Welding, Zhenyu Fei, Zengxi Stephen Pan, Dominic Cuiuri, Hui Jun Li, Azdiar Adil Gazder
Faculty of Engineering and Information Sciences - Papers: Part B
The ballistic performance of armour steel welds using austenitic filler materials is poor on account of the disparity in the mechanical properties of the weld and base metals. Consequently, a novel Keyhole Gas Tungsten ArcWelding process with a trapezoidal AISI309 austenitic stainless steel interlayer was developed to tailor chemical composition and microstructure by controlling the solidification sequence. Results show that the dilution rate in the weld metal region can reach up to 43.5% by placing a specially designed interlayer in between the base metal, providing a major scope for microstructure modification. Detailed weld analysis was undertaken by X-ray diffraction, optical …
In-Situ Cu Coating On Steel Surface After Oxidizing At High Temperature,
2019
University of Science and Technology Liaoning, Ansteel Iron & Steel Research Institute
In-Situ Cu Coating On Steel Surface After Oxidizing At High Temperature, Na Li, Ruizhi Jia, Hongmei Zhang, Wei Sha, Yan Li, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
Almost all copper in scrap steel is recovered, so research on copper-bearing steel has profound practical significance. The surface enrichment of copper occurs in all copper-bearing steels studied in this paper after being heated at high temperature. In-situ oxidation-induced copper coatings were discovered on the descaled copper-bearing steels after heating at around 1150 °C for 2 h in air. Scattered copper precipitates in or under rust after heating at a lower temperature. A new concept was created using in-situ composites prepared by direct oxidation of matrix, and there was no bonding problem found between the coating and the matrix. The …
3d Printable Linear Soft Vacuum Actuators: Their Modeling, Performance Quantification And Application In Soft Robotic Systems,
2019
University of Wollongong
3d Printable Linear Soft Vacuum Actuators: Their Modeling, Performance Quantification And Application In Soft Robotic Systems, Charbel Tawk, Geoffrey M. Spinks, Marc In Het Panhuis, Gursel Alici
Faculty of Engineering and Information Sciences - Papers: Part B
Conventional robotic systems have proved their versatility in the industry where complex tasks requiring high force, high speed and high precision are desired. However, these rigid-bodied systems cannot collaborate safely with humans. Soft robots which are primarily made of highly compliant materials bring robots and humans together by operating safely in unstructured environments. Soft robots demand dexterous soft actuators that preserve or enhance their softness and safety features. This article reports on modeling, performance quantification, and soft robotic applications of directly three-dimensional (3-D) printed linear soft vacuum actuators (LSOVA), that are manufactured in a single step, using a low-cost and …
Mechanical Properties Of Aluminium Metal Matrix Nanocomposites Manufactured By Assisted-Flake Powder Thixoforming Process,
2019
University of Wollongong, King Saud University
Mechanical Properties Of Aluminium Metal Matrix Nanocomposites Manufactured By Assisted-Flake Powder Thixoforming Process, Saud Almotairy, Alireza Fadavi Boostani, M Hassani, Dongbin Wei, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
This study discusses the superior effect of thixoforming process on enhancing the tensile properties of aluminium matrix composite produced using flake metallurgy route. The flake metallurgy process was utilised to manufacture aluminium matrix composites followed by thixoforming process. Microstructural investigations carried out using transmission electron microscope have shown the synergic effect of thixoforming process on rendering uniform distribution of SiC nanoparticles associated with lower porosity content. X-ray diffraction characterisations have revealed the promising effect of uniform dispersion of SiC nanoparticles on restricting the grain growth of aluminium matrix within nanoscale regime (90 nm) even at high semi-solid thixoforming temperatures (575 …
Robust Adaptive Sliding Mode Pi Control For Active Vehicle Seat Suspension Systems,
2019
University of Wollongong
Robust Adaptive Sliding Mode Pi Control For Active Vehicle Seat Suspension Systems, Wenxing Li, Haiping Du, Donghong Ning, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part B
In this paper, a robust adaptive sliding mode proportional integral control (RASMPIC) method is proposed for an active vehicle seat suspension system, where the driver's mass is supposed as an unknown parameter with boundaries. A dynamic active seat suspension system is established at first. Then a sliding mode controller (SMC) is designed to achieve the required ride comfort performance based on the driver's mass estimated by utilizing an adaptive law where a projecting adaptive algorithm is used to prevent the estimated parameters from surpassing their boundaries to enhance the robustness of the seat suspension system. Also, a proportional and integral …
Flexible Surface Electrodes Targeting Biopotential Signals From Forearm Muscles For Control Of Prosthetic Hands: Part 1 - Characterisation Of Semg Electrodes,
2019
University of Wollongong
Flexible Surface Electrodes Targeting Biopotential Signals From Forearm Muscles For Control Of Prosthetic Hands: Part 1 - Characterisation Of Semg Electrodes, Siobhan O'Brien, Thomas Searle, Gursel Alici
Faculty of Engineering and Information Sciences - Papers: Part B
This study is Part 1 of two studies which investigate the use of various flexible surface sensors as an alternative to the gold standard Ag/AgCl surface electromyography (sEMG) electrodes in identifying movement intention from a user during common hand gestures. Three conductive textiles, two commercial conductive elastomers and one E-skin elastomer produced on site were tested as biopotential electrodes to establish the efficacy of each in gathering movement intention from the human brain at the level of the muscle. Testing was performed in vivo on two participants across three hand gestures, with results demonstrating that sEMG electrodes made from a …
Flexible Surface Electrodes Targeting Biopotential Signals From Forearm Muscles For Control Of Prosthetic Hands: Part 2 - Characterization Of Substrates For Strain Sensors,
2019
University of Wollongong
Flexible Surface Electrodes Targeting Biopotential Signals From Forearm Muscles For Control Of Prosthetic Hands: Part 2 - Characterization Of Substrates For Strain Sensors, Siobhan O'Brien, Thomas Searle, Gursel Alici
Faculty of Engineering and Information Sciences - Papers: Part B
This study investigates the use of stretchable strain sensors as an alternative to the gold standard Ag/AgCl surface electromyography (sEMG) electrodes currently utilised to identify movement intention from a user during common hand gestures. Further building on the research in the companion paper, this study documents a series of strain characterisation experiments undertaken on three conductive textiles, two commercial conductive elastomers and one E-skin elastomer produced on site to determine the linearity of each sensor, along with the magnitude of hysteresis in a single stretch and release cycle, and any creep effects present. Gesture identification testing was performed in vivo …
Fully 3d Printed Monolithic Soft Gripper With High Conformal Grasping Capability,
2019
University of Wollongong
Fully 3d Printed Monolithic Soft Gripper With High Conformal Grasping Capability, Charbel Tawk, Yuan Gao, Rahim Mutlu, Gursel Alici
Faculty of Engineering and Information Sciences - Papers: Part B
The recent advances in material science and engineering disciplines have had a significant impact on the robotics field where numerous bioinspired soft robots have been developed. Roboticists can now develop and fabricate soft robotic systems made of materials with low elasticity using additive manufacturing technologies. One of the most studied classes of soft robotic systems is soft adaptive grippers. In this work, we present a novel fully 3D printed soft pneumatic gripper that incorporates a novel design of soft pneumatic chambers and a bioinspired fin-ray structure for conformal grasping. The soft gripper was printed in a single step using a …
Secondary Students' Ideas About Scientific Concepts Underlying Climate Change,
2019
University of Wollongong
Secondary Students' Ideas About Scientific Concepts Underlying Climate Change, Lorna E. Jarrett, George J. Takacs
Faculty of Engineering and Information Sciences - Papers: Part B
We present ideas about concepts underlying climate change, held by students in years 9 and 10. Misconceptions about climate change are common among students, and may be due to misconceptions about underlying concepts. To investigate this, we developed the Climate Change Concept Inventory (CCCI), and trialed it with 229 students; corroborating findings through focus group interviews. Our interview method and data analysis methods are described. Findings included overestimation of human contributions to atmospheric carbon inputs, ultra violet radiation in sunlight, and greenhouse gases in the atmosphere. Students were unaware that CO2 dissolves in water, and of the role of oceans …
Evaluation Of Different B-Values In Dwi And 1h Mrs For Pancreatic Cancer And Pancreatitis: A Rabbit Model,
2019
Qiqihar Medical University, University of Wollongong
Evaluation Of Different B-Values In Dwi And 1h Mrs For Pancreatic Cancer And Pancreatitis: A Rabbit Model, Liguo Hao, Lijie Liu, Xin Meng, Guanghao Yu, Enbang Li, Hongqian Gu
Faculty of Engineering and Information Sciences - Papers: Part B
Pancreatic cancer is a common malignant tumor with high incidence of metastasis. Currently, there is no absolute standard for the choice of b-value for diffusion-weighted imaging (DWI) for pancreatic cancer. The b-value is rarely reported in animal model study, especially in pancreatic cancer/mass pancreatitis rabbit models. The authors' aim was to determine the different b-values to differentiate the diagnosis of pancreatic cancer and mass pancreatitis in rabbit models using DWI. When comparing the effect of different b-values in diagnostic process, the pathological results could be regarded as the gold standard. In this research, 30 healthy New Zealand rabbits were selected …
