摘要
在工程领域中,裂纹尖端的应力应变状况是众多影响裂纹扩展的重要因素之一,材料塑性对裂纹尖端应力应变场又有着重大的影响。为此,本文利用ABAQUS有限元软件,以工程中常用的紧凑拉伸试样为基础,分析了材料塑性对裂纹尖端应力应变参量的影响;并对其应力强度因子(KI)和J积分(J)进行了必要的验证以确保模型的正确性;在所建模型的基础上对所得结果进行了分析比较,包括应力强度因子和J积分沿厚度方向上的变化规律,材料塑性对不同路径上应力和J积分的影响,以及材料塑性对裂纹尖端区域应力应变的影响等。研究成果为进一步研究裂纹尖端断裂过程区的应力应变状况,特别是材料参数对裂纹尖端场的影响提供了一定的理论基础。
In the field of engineering,the stress-strain state at the crack tip is one of the important factors affecting crack propagation,and material plasticity has a significant impact on the stress-strain field at the crack tip.Therefore,this article uses ABAQUS finite element software to analyze the influence of material plasticity on the stress-strain parameters at the crack tip,based on compact tensile specimens commonly used in engineering;And necessary verification was conducted on its stress intensity factor(KI)and J-integral(J)to ensure the correctness of the model;Based on the established model,the obtained results were analyzed and compared,including the changes in stress intensity factor and J-integral along the thickness direction,the influence of material plasticity on stress and J-integral along different paths,and the influence of material plasticity on stress and strain in the crack tip region.The research results provide a theoretical basis for further studying the stress-strain status of the crack tip fracture process zone,especially the influence of material parameters on the crack tip field.
作者
张凯铭
ZHANG Kaiming(Xi'an Traffic Engineering Institute,Xi'an Shaanxi 710300,China)
出处
《西安交通工程学院学术研究》
2023年第3期11-16,共6页
Academic Research of Xi'an Traffic Engineering Institute
