相似材料轴对称弹性接触部分滑移双峰振荡中的 Smith-Watson-Topper 参数:载荷协议和轮廓几何的影响

Eng Pub Date : 2024-02-19 DOI:10.3390/eng5010018
E. Willert
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引用次数: 0

摘要

在任意二维斜向加载条件下,通过非常快速的数值计算程序确定了轴对称弹性体摩擦接触下面的次表面应力场,在此基础上详细研究了加载参数和接触轮廓几何形状对具有叠加法向和切向振荡的弹性摩擦接触中史密斯-沃森-托普(SWT)疲劳裂纹萌发参数的接触机械影响。应力计算的高效性允许对影响变量的多维参数空间进行全面的物理分析。研究发现,叠加的触点法向振荡会显著增加或减少 SWT 参数,这取决于法向振荡和切向振荡之间的初始相位差和频率比。用适当的非尺寸变量表示,与具有相同曲率的全抛物面相比,圆形扁平冲头的 SWT 参数值总是较小,而截顶抛物面的 SWT 参数值则较大。小的叠加轮廓波纹也会显著增加或减少 SWT 参数,具体取决于波纹的振幅和波长。虽然加载协议和剖面几何形状都能显著改变 SWT 参数,但这两个影响因素之间的耦合很弱。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Smith–Watson–Topper Parameter in Partial Slip Bimodal Oscillations of Axisymmetric Elastic Contacts of Similar Materials: Influence of Load Protocol and Profile Geometry
Based on a very fast numerical procedure for the determination of the subsurface stress field beneath frictional contacts of axisymmetric elastic bodies under arbitrary 2D oblique loading, the contact mechanical influences of loading parameters and contact profile geometry on the Smith–Watson–Topper (SWT) fatigue crack initiation parameter in elastic fretting contacts with superimposed normal and tangential oscillations are studied in detail. The efficiency of the stress calculation allows for a comprehensive physical analysis of the multi-dimensional parameter space of influencing variables. It is found that a superimposed normal oscillation of the contact can significantly increase or decrease the SWT parameter, depending on the initial phase difference and frequency ratio between the normal and tangential oscillation. Written in proper non-dimensional variables, the rounded flat punch always exhibits smaller values of the SWT parameter, compared to a full paraboloid with the same curvature, while the truncated paraboloid exhibits larger values. A small superimposed profile waviness also significantly increased or decreased the SWT parameter, depending on the amplitude and wave length of the waviness. While both the load protocol and the profile geometry can significantly alter the SWT parameter, the coupling between both influencing factors is weak.
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Eng
Eng
CiteScore
2.10
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