Associated computational plasticity schemes for nonassociated frictional materials

2012 ◽  
Vol 90 (9) ◽  
pp. 1089-1117 ◽  
Author(s):  
K. Krabbenhoft ◽  
M. R. Karim ◽  
A. V. Lyamin ◽  
S. W. Sloan
Keyword(s):  
Frictional Materials ◽  
Computational Plasticity

scholarly journals Breathable Materials for Triboelectric Effect-Based Wearable Electronics

2018 ◽  
Vol 8 (12) ◽  
pp. 2485 ◽  
Author(s):  
Congju Li ◽  
Ran Cao ◽  
Xiuling Zhang
Keyword(s):  
Recent Progress ◽  
Dielectric Materials ◽  
Wearable Devices ◽  
Wearable Electronics ◽  
Practical Application ◽  
Metal Mesh ◽  
Frictional Materials ◽  
Nanofiber Membranes ◽  
Materials Used ◽  
Triboelectric Effect

Wearable electronics are believed to be the future of the next-generation electric devices. However, the comfort of current wearable devices is greatly limited due to the use of airtight materials, which may even lead to inflammation of the skin. Therefore, breathable, skin-friendly materials, are highly desired for wearable devices. Here, the recent progress of the breathable materials used to fabricate skin-friendly electronics is reviewed by taking triboelectric effect-based wearable electronics as a typical example. Fibers, yarns, textiles, and nanofiber membranes are the most popular dielectric materials that serve as frictional materials. Metal mesh, silver yarn, and conductive networks made up of nanomaterial are preferred as air-permissive electrodes. The breathable materials for skin-friendly wearable electronics summarized in this review provide valuable references for future fabrication of humanized wearable devices and hold great significance for the practical application of wearable devices.

scholarly journals Comparison of a Material Point Method and a Galerkin Meshfree Method for the Simulation of Cohesive-Frictional Materials

Materials ◽  
2017 ◽  
Vol 10 (10) ◽  
pp. 1150 ◽  
Author(s):  
Ilaria Iaconeta ◽  
Antonia Larese ◽  
Riccardo Rossi ◽  
Zhiming Guo
Keyword(s):  
Material Point Method ◽  
Meshfree Method ◽  
Material Point ◽  
Point Method ◽  
Frictional Materials ◽  
Galerkin Meshfree

Improved energy conversion efficiency of the ultrasonic motor with surface texture

2018 ◽  
Vol 70 (9) ◽  
pp. 1729-1736 ◽  
Author(s):  
Xiaoliang Liu ◽  
Jinhao Qiu ◽  
Gai Zhao
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Surface Texture ◽  
Energy Conversion Efficiency ◽  
Ultrasonic Motor ◽  
Frictional Material ◽  
Content Type ◽  
Output Performance ◽  
Frictional Materials ◽  
Ptfe Composites

Purpose This paper aims to investigate the effect of frictional materials and surface texture on the energy conversion efficiency and the mechanical output performance of the ultrasonic motor (USM). Design/methodology/approach A newly designed testing system was set up to measure the mechanical output performance of the USM. The influence of different frictional materials on the output performance of the USM was studied under the same assembly process and parameters. The surface texture was fabricated by laser ablation processing. The effects of surface texture and input parameters on the energy conversion efficiency and mechanical output performance of the USM were studied. Findings The results show that polyimide (PI) composites as frictional material can significantly improve the output performance of the USM compared to polytetrafluoroethylene (PTFE) composites. When the pre-load is 240 N, the energy conversion efficiency of the USM using textured PI composites as frictional material can reach 41.93 per cent, increased by 29.21 per cent compared to PTFE composites, and the effective output range of the USM is increased to 0.7-1.1 N m. Besides, the pre-load and surface texture have a great influence on the output performance of the USM. Originality/value PI composites can improve the mechanical output performance of the USM. Surface texture can also improve the interface tribological properties and the energy conversion efficiency based on the advanced frictional materials, which will contribute to the increment of the output performance of the USM under the same input conditions.

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