Numerical analysis of indentation-induced cracking of brittle coatings on ductile substrates
Numerical analysis of indentation-induced cracking of brittle coatings on ductile substrates
复制标题
DOI：
10.1016/s0020-7683(01)00280-3
复制
发表时间：
2002-03
影响因子：
3.6
通讯作者：
A. Abdul-Baqi;V. Giessen
中科院分区：
文献类型：
--
作者：
A. Abdul-Baqi;V. Giessen
采用有限元法研究了硬质涂层在压痕过程中的开裂问题。涂层被假定为线弹性的，基板是理想的弹性塑性和压头是球形和刚性。使用内聚表面模拟三层厚度裂纹，具有有限的强度和断裂能。涂层和基材之间的界面也通过内聚区建模，但具有界面特性。涂层裂纹萌生的主要潜在位置是靠近接触边缘的涂层表面和接触区界面的涂层侧，在那里发现高值的拉伸径向应力。发现周向裂纹从涂层表面萌生并向界面扩展。裂纹的萌生和发展作为一个弯折印在载荷-位移曲线上。连续裂纹之间的间距被发现是涂层厚度的顺序。其他材料和粘结参数的影响的第一个裂纹的萌生和连续裂纹之间的间距也进行了研究。
Cracking of hard coatings during indentation is studied using the finite element method. The coating is assumed to be linear elastic, the substrate is elastic-perfectly plastic and the indenter is spherical and rigid. Through-thickness cracks are modeled using cohesive surfaces, with a finite strength and fracture energy. The interface between the coating and the substrate is also modeled by means of cohesive zones but with interface properties. The primary potential locations for the initiation of coating cracks are the coating surface close to the contact edge and the coating side of the interface in the contact region, where high values of tensile radial stress are found. Circumferential cracks are found to initiate from the coating surface and to propagate towards the interface. The initiation and advance of a crack is imprinted on the load–displacement curve as a kink. The spacing between successive cracks is found to be of the order of the coating thickness. The influence of other material and cohesive parameters on the initiation of the first crack and spacing between successive cracks is also investigated.