带裂缝梁的裂纹拓展分析

Crack Extension Analysis on Cracked Beams

在许多工程中,材料自身缺陷是引起裂纹产生的主要因素之一。在正常使用中裂纹会在某种条件下拓展,最终导致构件破坏。基于有限单元法,利用有限元分析软件Abaqus(主要是应用XFEM裂纹拓展技术)对带裂缝的铝合金梁进行裂纹拓展分析,并通过实验结果验证有限元分析的准确性,最终得到带裂缝梁在外荷载作用下从开始形成裂纹到整个梁被破坏的过程。从中可以发现带裂缝金属梁的裂纹开裂位置通常都在薄弱位置,即裂缝处,而且会在裂缝的两个直角处先发生材料的损坏。

Material defect is one of the main reasons of cracking in many construction projects.Under certain circumstances,crack extends and finally leads to component damage.Based on finite element me-thod,Abaqus(with an application of the XFEM crack extension technique)is used to analyze the cracked aluminum alloy bean for its crack extension.The accuracy of finite element analysis is tested through experiments.The whole process of cracked beam finally being destroyed under loads is reproduced.It is found that the cracks of the metal beams usually locate in a weak position,and the material firstly suffers from damage at the two right angles of the crack.