基于相场模型的裂纹贯穿程度对试件强度影响研究  

Study on the Effect of Crack Penetration Degrees on Strength Properties of Samples Based on the Phase Field Model

作　　者：高宇 陈颖 岳强 王桥 周伟[2] 张晨露 GAO Yu;CHEN Ying;YUE Qiang;WANG Qiao;ZHOU Wei;ZHANG Chenlu(Datang Xuanwei Hydropower Development Co.,Ltd.,Qujing 655499,China;School of Water Resources&Hydropower Engineering,Wuhan Univ.,Wuhan 430072,China)

机构地区：[1]大唐宣威水电开发有限公司,云南曲靖655499 [2]武汉大学水利水电学院,武汉430072

出　　处：《三峡大学学报（自然科学版）》2021年第6期23-28,共6页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金项目(51979207)。

摘　　要：断裂是一种主要的破坏形式,客观准确地描述裂纹在复杂应力作用下的扩展对结构工程具有非常重要的意义.较之其他数值模拟方法,相场模型操作简便,且能模拟复杂的裂纹形式,本文基于统一拉伸断裂准则的混合模式断裂相场模型,分别研究了试件在拉伸、剪切以及混合拉剪等不同加载条件下不同初始裂纹贯穿程度下的裂纹扩展情况及力学响应,根据以上算例的结果验证了相场模型在复杂应力下模拟裂纹扩展的适用性,对裂纹预测有重要的作用.Fracture is a major failure mode.It is of great significance for structural engineering to objectively and accurately describe the propagation of cracks under complex stress.Compared with other numerical simulation methods,the phase field model is easy to operate and can simulate complex crack modes.Based on the mixed-mode fracture phase field model of the unified tensile fracture criterion,this paper studies the crack propagation with different initial crack lengths and the effect on the material strength under different loading conditions such as tensile,shear,and tensile shear respectively.According to the results of the above calculation examples,the applicability of the phase field model to simulate crack growth under complex stresses was verified,and it could play an important role in crack prediction.

关 键 词：相场模型 裂纹扩展 复杂应力 初始裂纹长度 

分 类 号：TU43[建筑科学—岩土工程]