基于ANSYS的实际粗糙表面法向接触刚度有限元分析

Wei Wang, Q. Tang, Xiaodong Xu, S. Gong
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引用次数: 1

摘要

采用LEXT OLS4000形貌测量仪采集真实粗糙表面数据。针对统计模型和分形模型均不能反映真实表面和表面应力的不足,基于逆向工程的思想建立了真实粗糙表面模型。利用ANSYS对实际粗糙表面的法向接触进行了研究,将其简化为刚性平面与粗糙表面的接触。研究表明,正常加载曲线与正常卸载曲线之间存在滞回现象,这是由于某些凸起的塑性变形导致的,完全卸载后,粗糙表面的残余压应力对材料性能有利,并且残余应力随卸载开始时的加载量而变化。法向接触刚度随法向载荷先增大后减小,并受微体表面形貌和残余表面应力的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Finite Element Analysis of Normal Contact Stiffness between Real Rough Surfaces Based on ANSYS
The data of real rough surface are captured by using the morphology measuring instrument LEXT OLS4000. Contraposing the scarcities that no rough surface produced with either statistical model or fractal model can represent the real surface and reflect the surface stress, the real rough surface model is built based on the idea of reverse engineering. ANSYS is employed in research on the normal contact between the real rough surfaces, which is predigested with the contact between a rigid plane and a rough surface. The study shows that hysteresis phenomenon presents itself between the normal loading curve and the normal unloading curve as a result of some asperities' plastic deformation, which also brings on residual press-stress benefits for material properties on the rough surface after unloading completely and the residual stress varies with the amount of load at the start of unloading. Normal contact stiffness increases first and then decreases along with the normal load, and is also affected by surface topography and the residual surface stress of the micro-body.
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