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An interfacial element method based on the effect of interfacial phase[J].计算力学学报,2019,36(5):569~575

An interfacial element method based on the effect of interfacial phase
An interfacial element method based on the effect of interfacial phase

DOI：10.7511/jslx20180810001

 作者 单位 E-mail 夏日 上海交通大学 船舶海洋与建筑工程学院, 上海 200240 许金泉 上海交通大学 船舶海洋与建筑工程学院, 上海 200240 jqxu@sjtu.edu.cn

界面是由复杂的界面相简化而成的，界面破坏实际是界面相材料的破坏。数值计算为了方便，如经典模型和内聚力模型等，都把很薄的界面相作无厚度化处理。导致只能考虑界面的面力，而无法考虑界面相内的应力（平行于界面方向的应力）。使界面失效准则先天性地排除了界面相内部应力的影响，从界面相材料失效机理的角度来看这是不够严谨的。本文将界面相材料等效为一种弹性连续体，由界面本构关系推导得到了一种新的界面单元。该单元具有界面参数易确定、对界面相物性可以进行等效描述等优点。通过商用有限元软件ABAQUS和用户子程序UEL实现了数值分析，并与直接物理模型的数值模拟结果进行对比，证明了本方法的简便及准确性。通过对不同界面相厚度结构的进一步分析，探讨了本文方法的可行范围。

An interface is simplified from a complex interfacial phase,and interface failure is actually the failure of an interphase.For convenience of numerical analysis,classic model and cohesive zone model take a thin interphase as a zero-thickness interface.As a result,only surface force at an interphase is considered,but inner stress within an interphase is neglected.This would lead to an inherent absence of influence of inner stress in an interface failure criterion,which is imprecise from the view point of interphase material failure.By assuming interfacial phase as an equivalent elastic continuum,a new interfacial element which can give an equivalent description of interface mechanical properties is derived from interface constitutive relation in this paper,and the relevant parameters are convenient to quantize.Numerical simulation is performed with commercial FEM software ABAQUS and user subroutine UEL,which agrees well with numerical results of direct physical model.By several further analyses of structures with different interfacial phase thicknesses,applicability of this method is discussed.