混凝土CCNBD型圆盘试件混合型断裂参数数值模拟研究

摘要

In this paper,a unified method combining the interaction integral method and the extended finite element method was proposed to evaluate the mixed stress intensity factor (SIF) and T stress of concrete specimen (CCNBD).In order to predict the crack initiation angle,fracture resistance and preferably generalize the use of generalized maximum tangential stress (GMTS) standard,the dimensionless stress intensity factor and the dimensionless T stress factor of the CCNBD specimen with different prefabricated fracture angles were calculated.The results showed that the method proposed in this paper is very consistent with the FEOD method.%提出了一种将交互积分法与扩展有限元法相结合的统一方法,用来评估混凝土中心裂隙圆盘(CCNBD)型试件的混合应力强度因子(SIF)和T应力.为了预测裂纹起始角和断裂阻力以及更好的应用广义最大切向应力(GMTS)标准,对CCNBD型试件的不同预制裂缝角度的无量纲应力强度因子和无量纲T应力因子进行了计算,结果表明所提出的方法与FEOD法非常相一致.