滚动滑动接触中固体润滑膜损伤演变的有限元分析

Peng Lv, Changling Tian, Yujun Xue, Yongjian Yu, Haichao Cai, Yanjing Yin
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引用次数: 0

摘要

基于内聚区模型(CZM),建立了滚动-滑动接触状态下薄膜-基片承载系统的有限元模型。通过分析薄膜-基底系统的法向和切向承载状态,研究了滑动-滚动比和薄膜-基底粘附强度对薄膜-基底系统界面应力和界面能量释放率的影响。结果表明,在滚动接触中,接触区两侧的应力分布几乎对称。在滚动-滑动接触中,接触区前缘出现明显的沿滚动-滑动方向的剪切流,导致接触区前缘界面的剪切应力显著增加,增加了界面破坏和分层失效的风险。同时,剪切流导致接触区后薄膜表面的法向拉伸应力集中,极易引起薄膜表面裂纹的出现和扩展。此外,薄膜与基底界面的粘附强度和承载能力之间存在明显的正相关关系。无论滚动或滚动-滑动接触状态如何,切向分层破坏主要发生在界面上。
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Finite Element Analysis of Damage Evolution of Solid Lubrication Film in Rolling–Sliding Contact
Based on the cohesive zone model (CZM), a finite element model of the film–substrate bearing system in the rolling–sliding contact state is established. Through analyzing the normal and tangential bearing states of the film–substrate system, the effects of the sliding–rolling ratio and the film–substrate adhesion strength on the interfacial stress and the interfacial energy release rate of the film–substrate system are studied. The results show that there is an almost symmetric stress distribution at both sides of the contact zone in rolling contact. In rolling–sliding contact, obvious shear flow along the rolling–sliding direction occurs at the front edge of the contact zone, which results in a significant increase in the shear stress at the interface at the front edge of the contact zone, increasing the risk of interface damage and delamination failure. Meanwhile, the shear flow causes a normal tensile stress concentration along the film surface behind the contact zone, which very easily causes the emergence and expansion of the film surface cracks. In addition, there is a clear positive correlation between the adhesion strength and the load-bearing capacity of the film–substrate interface. The tangential delamination damage mainly occurs at the interface regardless of the rolling or rolling–sliding contact state.
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