Fretting contact of layered materials with vertical cracks near surfaces
Fretting contact of layered materials with vertical cracks near surfaces
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表面附近有垂直裂纹的层状材料的微动接触
DOI：
10.1016/j.ijmecsci.2021.106361
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发表时间：
2021-05
影响因子：
7.3
通讯作者：
Dong He
中科院分区：
文献类型：
--
作者：
Qingbing Dong;Zhuang Chen;Kun Zhou;Dong He
建立了含垂直裂纹层状材料二维微动接触的半解析模型，研究了层状材料和裂纹对接触行为的影响。基于Eshelby等效夹杂法，将该层假定为一个等效本征应变未知的无限延伸夹杂。混合模式的I和II裂纹被假定为具有开放的面和封闭的尖端，其中每个都是由一个分布的攀登和滑移位错与未知的密度值根据离散位错技术模拟。基于共轭梯度法，在两个单独的子程序中顺序确定未知量。在接触模型中引入特征位移和裂纹诱导位移，并考虑了加载历史。应力强度因子是基于位错密度的解来确定的，假设裂纹诱导位移在尖端处呈抛物线形状。得出的结论是，接触载荷产生的倾向，关闭裂纹面，但在不同的模式在基板和层。模式II应力强度因子取决于裂纹位置和层刚度。层/基板界面和裂纹尖端，可能导致材料失效的应力集中进行了研究。所得结论为层状材料的微动断裂研究提供了理论依据。
A semi-analytical model is developed for the two-dimensional fretting contact of layered materials with vertical cracks near surfaces to investigate the effects of layers and cracks on the contact behaviors. The layer is assumed as an infinitely extended inclusion with unknown equivalent eigenstrain values based on Eshelby's equivalent inclusion method. The mixed-mode I and II cracks are assumed to have opened faces and closed tips, each of which is simulated by a distribution of climb and glide dislocations with unknown density values according to the discrete dislocation technique. The unknowns are sequentially determined in two separate subroutines based on the conjugate gradient method. The eigen-displacement and crack-induced displacement are introduced into the contact model with the loading history considered. The stress intensity factors are determined based on the solutions of the dislocation densities, assuming the plots of the crack-induced displacement are in parabolic shapes at the tips. It is concluded that the contact loading produces a tendency to close crack faces but in different patterns in the substrate and layer. Mode II stress intensity factors depend on crack locations and layer stiffness. Stress concentrations at the layer/substrate interface and crack tips that may lead to material failures are investigated. The conclusions provide insights into fretting fracture in layered materials.
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DOI：
--
发表时间：
--
期刊：
Crelle's Journal
影响因子：
--
作者：
Hertz
通讯作者：
Hertz
影响因子：
2.7
作者：
Z. Xiao;J. Yan;B. J. Chen
通讯作者：
Z. Xiao;J. Yan;B. J. Chen
影响因子：
7.3
作者：
K. Zhou;Rongbing Wei
通讯作者：
K. Zhou;Rongbing Wei
影响因子：
3.5
作者：
Qingbing Dong;K. Zhou
通讯作者：
Qingbing Dong;K. Zhou
影响因子：
5.4
作者：
S. Giordano;L. Colombo
通讯作者：
S. Giordano;L. Colombo