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Full-Text Articles in Engineering
Adapted Pool Cue, Cole Clark, Daniel Patterson, Michelle Cheung, Dylan Sauer
Adapted Pool Cue, Cole Clark, Daniel Patterson, Michelle Cheung, Dylan Sauer
Mechanical Engineering
Our primary goal was to develop an adaptive device to allow a user with limited upper body mobility to more effectively play a game of pool. Within this goal it was important to design around the concept of a least restrictive environment, in order to provide the user with as close to a standard pool playing experience as possible. The device was designed to specifically meet the needs of John Lee, an Assistive Technology Specialist at Cal Poly's Disability Resource Center. Mr. Lee has muscular dystrophy, which limits his upper and lower body mobility and currently requires his use of …
Blds Articulated Mounting Feet, Mitchell D. Conn, Chris Mazzucco
Blds Articulated Mounting Feet, Mitchell D. Conn, Chris Mazzucco
Mechanical Engineering
This final report summarizes all of the efforts of the Senior Project aimed at creating Articulating Mounting Feet for the BLDS. The project focuses on improving the design of the mounting feet for the current Boundary Layer Data System at Cal Poly, San Luis Obispo. Dr. Russ Westphal, the project’s sponsor, wishes that our team focus primarily on a reliable and lightweight mount design for a curved wing, with only transverse curvature. Dr. Westphal is currently researching the boundary layer effects on airplane wings at Cal Poly, and the ability to mount to a multitude of surface contours would increase …
Formation Of Magnesium Diboride-Based Materials With High Critical Currents And Mechanical Characteristics By High-Pressure Synthesis, Tetiana Prikhna, W. Gawalek, Ya M. Savchuk, N. V. Sergienko, V. E. Moshchil, M. Wendt, M. Zeisberger, T. Habisreuther, V. B. Sverdun, S X. Dou, S. N. Dub, V. S. Melnikov, Ch Schmidt, J. Dellith, P. A. Nagorny
Formation Of Magnesium Diboride-Based Materials With High Critical Currents And Mechanical Characteristics By High-Pressure Synthesis, Tetiana Prikhna, W. Gawalek, Ya M. Savchuk, N. V. Sergienko, V. E. Moshchil, M. Wendt, M. Zeisberger, T. Habisreuther, V. B. Sverdun, S X. Dou, S. N. Dub, V. S. Melnikov, Ch Schmidt, J. Dellith, P. A. Nagorny
Shi Xue Dou
The developed method of high-pressure synthesis (HPS) allows producing nanostructural highly dense material based on MGB2, which possesses the highest superconducting and mechanical characteristics among the known world analogues, in the form of blocks that are suitable for application in SC electromotors and pumps. Additions of Zr can increase critical current density (jc) of synthesized at 2 GPa and 750-800 °C MGB2 in the same manner as additions of Ta or Ti, i.e. due to the absorption of impurity hydrogen forming the ZrH2. The formation of ZrB2 phase at higher synthesis temperatures (about 950 °C) in HPS MGB2 does not …
Superlattice Ultrasonic Generation, Thomas E. Wilson, M. Oehme, E. Kasper, H-J. L. Gossmann
Superlattice Ultrasonic Generation, Thomas E. Wilson, M. Oehme, E. Kasper, H-J. L. Gossmann
Thomas E. Wilson
We report the first experimental evidence for the resonant excitation of coherent high-frequency acoustic phonons in semiconducting doping superstructures by far-infrared laser radiation. After a grating-coupled delta-doped silicon doping superlattice is illuminated with ~1 kW/mm2 nanosecond-pulsed 246 GHz laser radiation, a delayed nanosecond pulse is detected by a superconducting bolometer at a time corresponding to the appropriate time-of-flight for ballistic longitudinal acoustic phonons across the (100) silicon substrate. The absorbed phonon power density in the microbolometer is observed to be ~10 μW/mm2, in agreement with theory. The phonon pulse duration also matches the laser pulse duration. The absence of any …
Microstructural Evolution And Mechanical Property Of Aa5050 Alloy Deformed By Accumulative Roll Bonding, Kuiyu Cheng, Cheng Lu, A Kiet Tieu, Hongtao Zhu
Microstructural Evolution And Mechanical Property Of Aa5050 Alloy Deformed By Accumulative Roll Bonding, Kuiyu Cheng, Cheng Lu, A Kiet Tieu, Hongtao Zhu
Faculty of Engineering and Information Sciences - Papers: Part A
In this study, ultrafine-grained AA5050 sheets were fabricated by the accumulative roll bonding (ARB) process. Transmission electron microscope observations showed that at the early stage of ARB, the grain size was reduced in the normal direction and became elongated along the rolling direction. The elongated grains were cut out by dense dislocations, which then tangled and condensed, resulting in the formation of dislocation cells. As the deformation proceeded, the dislocation cells evolved to sub-grain boundaries and then grain boundaries. The ultrafinegrained microstructure was obtained via four ARB cycles. The tensile tests at 473 K and 523 K (200 degrees C …
Molecular Weight Distribution Of Network Strands In Double Network Hydrogels Estimated By Mechanical Testing, Hai Xin, Hugh Ralph Brown, Geoffrey M. Spinks
Molecular Weight Distribution Of Network Strands In Double Network Hydrogels Estimated By Mechanical Testing, Hai Xin, Hugh Ralph Brown, Geoffrey M. Spinks
Faculty of Engineering and Information Sciences - Papers: Part A
The remarkably high toughness of double network (DN) hydrogels is related to the energy dissipation that occurs due to the scission of network strands in the most tightly crosslinked of its two interpenetrating networks. The loading curve during tensile testing of DN hydrogels usually takes a complex shape and sometimes shows yielding. Wang and Hong recently proposed a model [1] based on the successive scission of the shortest remaining elastically active strands during tensile loading that predicts the shape of the loading curve of one DN hydrogel reasonably well. In the present study, the model was modified slightly and applied …
Electro-Mechanical Modelling And Identification Of Electroactive Polymer Actuators As Smart Robotic Manipulators, Rahim Mutlu, Gursel Alici, Xingcan Xiang, Weihua Li
Electro-Mechanical Modelling And Identification Of Electroactive Polymer Actuators As Smart Robotic Manipulators, Rahim Mutlu, Gursel Alici, Xingcan Xiang, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part A
Electroactive polymer (EAP) actuators, also known as artificial muscles, have remarkable properties such as low energy consumption, low weight, low actuation foot-print, compliance and bio-compatibility. Several methodologies have been proposed to model and analyse their quasi-static bending behaviour with negligible attention paid to their dynamic behaviour. We, therefore, report on an enhanced methodology to model their highly non-linear bending behaviour by treating them as smart and soft robotic manipulators. The methodology consists of an inverse kinematic model and a dynamic model. The proposed methodology accurately estimates the EAP actuator's whole shape deflection using optimization-based inverse kinematic solutions integrated with an …
Applications Of Controllable Smart Fluids To Mechanical Systems, Seung-Bok Choi, Norman Wereley, Weihua Li, Miao Yu, Jeong-Hoi Koo
Applications Of Controllable Smart Fluids To Mechanical Systems, Seung-Bok Choi, Norman Wereley, Weihua Li, Miao Yu, Jeong-Hoi Koo
Faculty of Engineering and Information Sciences - Papers: Part A
For this special issue, 20 papers have been received, and three of which have been withdrawn. After strict review processes by the world-wide experts on the smart fluids technology, 10 papers have been accepted and are published here.The published papers cover various application devices and systems, which can be controllable to achieve desired performances by applying the external fields to the smart fluid domains. A brief summary of each application item proposed in the published papers is given as follows.
A Validated Thermo Mechanical Fem Model Of Bead-On-Plate Welding, Djarot Darmadi, A Kiet Tieu, John Norrish
A Validated Thermo Mechanical Fem Model Of Bead-On-Plate Welding, Djarot Darmadi, A Kiet Tieu, John Norrish
Faculty of Engineering and Information Sciences - Papers: Part A
This paper is presenting accurate FEM model of bead-on-plate welds of 316L stainless steels through thermo-mechanical analysis. The model was composed using ANSYS Parametric Design Language (APDL) program. In thermal analysis, mixed mode of volumetric thermal load was used to represent moving heat source. Growing weld bead was accommodated in both the thermal and mechanical models using birth and death technique. Melting phenomenon was modelled by low stiffness and zero plastic strain of melting elements. Results from thermal analysis and subsequent mechanical analysis have been validated. Good agreements of predicted temperature histories, temperature field and residual stress with experimental results …
Microstructure And Mechanical Properties Of Aa5005/Aa6061 Laminated Composite Processed By Accumulative Roll Bonding, Lihong Su, Cheng Lu, Guanyu Deng, A Kiet Tieu
Microstructure And Mechanical Properties Of Aa5005/Aa6061 Laminated Composite Processed By Accumulative Roll Bonding, Lihong Su, Cheng Lu, Guanyu Deng, A Kiet Tieu
Faculty of Engineering and Information Sciences - Papers: Part A
ULTRAFINE-GRAINED (UFG) materials have been gathering much interest for the last two decades as the materials have extraordinary mechanical properties such as high strength, low temperature superplastisity, and high corrosion resistance. Severe plastic deformation (SPD) is the most widely used method to produce UFG materials. Accumulative roll bonding (ARB) has become one of the most important SPD techniques since it was first introduced by Saito et al.[1] As the same equipment as in conventional rolling is used, ARB is considered to be one of the most promising methods for manufacturing UFG sheet materials.
High Di-Electric Constant Nano-Structure Ceramics Synthesis Using Novel Electric Discharge Assisted Mechanical Milling And Magneto Ball Milling And Its Properties, Azrin A. Chowdhury, Andrzej Calka, David Wexler, Konstantin Konstantinov
High Di-Electric Constant Nano-Structure Ceramics Synthesis Using Novel Electric Discharge Assisted Mechanical Milling And Magneto Ball Milling And Its Properties, Azrin A. Chowdhury, Andrzej Calka, David Wexler, Konstantin Konstantinov
Faculty of Engineering and Information Sciences - Papers: Part A
The conventional method to prepare functional oxides is ceramicpowder- based processing typically via solid-state reaction of microcrystalline starting powders at high temperatures. Disadvantages of this approach include the high temperatures of reaction, limited degree of product chemical homogeneity and difficulties in achieving rapid sintering. Various chemicalbased processing routes have been developed to prepare powders of more homogeneous composition, improved reactivity and sintering ability at low temperatures. Regardless of the route chosen to synthesise complex oxides, almost all of them require lengthy heat treatment schedules that usually exceed 10 h, as well as multi-stage processing steps. We describe two approaches to …
Effects Of Temperature And Strain Rate On Microstructure And Mechanical Properties Of High Chromium Cast Iron/Low Carbon Steel Bimetal Prepared By Hot Diffusion-Compression Bonding, Xingjian Gao, Zhengyi Jiang, Dongbin Wei, Sihai Jiao, Dengfu Chen, Jianzhong Xu, Xiaoming Zhang, Dianyao Gong
Effects Of Temperature And Strain Rate On Microstructure And Mechanical Properties Of High Chromium Cast Iron/Low Carbon Steel Bimetal Prepared By Hot Diffusion-Compression Bonding, Xingjian Gao, Zhengyi Jiang, Dongbin Wei, Sihai Jiao, Dengfu Chen, Jianzhong Xu, Xiaoming Zhang, Dianyao Gong
Faculty of Engineering and Information Sciences - Papers: Part A
The objective of this study is to develop a hot diffusion-compression bonding process for cladding low carbon steel (LCS) to high chromium cast iron (HCCI) in solid-state. The influence of temperature (950-1150 degrees C) and strain rate (0.001-1 s (1)) on microstructure, hardness and bond strength of the HCCI/LCS bimetal were investigated. The interface microstructure reveals that the unbonded region can only be found for 950 degrees C due to lack of diffusion, while the intergrowth between the constituent metals occurred at and above 1100 degrees C. When bonding temperature increases to 1150 degrees C, a carbide-free zone was observed …
The Effect Of Ageing On Microstructure And Mechanical Properties Of Powder Ti-5al-5mo-5v-1cr-1fe Alloy, Mansur Ahmed, Dmytro Savvakin, Orest M. Ivasishin, E V. Pereloma
The Effect Of Ageing On Microstructure And Mechanical Properties Of Powder Ti-5al-5mo-5v-1cr-1fe Alloy, Mansur Ahmed, Dmytro Savvakin, Orest M. Ivasishin, E V. Pereloma
Faculty of Engineering and Information Sciences - Papers: Part A
The thermo-mechanically processed powder Ti-5Al-5V-5Mo-1Cr-1Fe alloy was aged at 9.23 K for 1-8 h in order to investigate the effect of ageing time on the microstructure-mechanical properties relationships. The microstructures of the alloy after ageing cosist of the both primary and secondary alpha phases with retained B matrix phase. The shift of B peaks in X-ray pattern with ageing time indicates an increase in lattice parameter distorition due to diffusion into the retained B phase of more B stabilisers with smaller atomic radius compared to the elemental Ti. The tensile test results indicate that the sample aged for 1 h …
The Effect Of Processing Parameters On The Microstructure And Mechanical Properties Of Low-Si Transformation-Induced Plasticity Steels, Fayez Alharbi, Azdiar A. Gazder, Andrii Kostryzhev, Bruno C. De Cooman, Elena Pereloma
The Effect Of Processing Parameters On The Microstructure And Mechanical Properties Of Low-Si Transformation-Induced Plasticity Steels, Fayez Alharbi, Azdiar A. Gazder, Andrii Kostryzhev, Bruno C. De Cooman, Elena Pereloma
Faculty of Engineering and Information Sciences - Papers: Part A
A base low Si, high-A1 transformation-induced plasticity (TRIP) steel and one with 0.03Nb and 0.002Ti (wt percent) additions were subjected to thermo-mechanical processing (TMP) and galvanising simulations. T
Bio-Hybrid Tubular Electrospun Scaffold For Vascular Tissue Engineering Application, Harsh Narendrakumar Patel
Bio-Hybrid Tubular Electrospun Scaffold For Vascular Tissue Engineering Application, Harsh Narendrakumar Patel
All ETDs from UAB
Atherosclerosis is an asymmetric thickening of the intima (innermost layer) of the artery due to plaque (a combination of lipids, debris, connective tissue elements and cells) build up causing the artery to become narrower and stiffer, resulting in a major hemodynamic disturbance[1, 2]. When atherosclerosis affects coronary arteries and prevents blood flow to the heart muscles posing a threat of, or a actual myocardial infarction, that condition is identified as coronary artery disease (CAD). To treat severely blocked coronary arteries,coronary artery bypass grafts (CABG) have became the gold standard for when angioplasty and stent placement has failed to unclog the …