基于内聚力模型的锆-钛-钢复合板剪切试验模拟

Simulation of shear force test for Zirconium-Titanium-steel Clad Plate by cohesive element method

摘要:

本文基于双线性张力位移法则，运用ABAQUS内置内聚力单元对锆-钛-钢复合板的剪切试验进行了有限元模拟，分析了界面断裂过程的应力分布特征，研究了内聚力强度、断裂能对于界面层损伤的影响，并验证了剪切强度预测公式的正确性。研究结果表明：内聚力单元可以模拟复合板界面层的断裂过程，且与剪切试验结果良好吻合；剪断位移与内聚力强度呈正相关；随着断裂能的增加，剪断位移、特征位移和最大剪切力都增加；剪切强度预测公式可对不同热处理工艺下剪切强度进行预测。

Abstract:

Based on bilinear force displacement law, finite element simulation of shear force test on zirconium-titanium-steel clad plate was carried out by using cohesive zone unit of ABAQUS, then, the effect of cohesive strength and fracture energy on the damage of interface layer was studied. Also the correctness of the prediction formula of shear strength was verified. The results show that cohesive element can simulate the fracture process of clad plate interface layer and agree very well with the results of shear force tests. Shearing displacement and cohesive strength was positively correlated. With the increase of fracture energy, shearing displacement, characteristic displacement and maximum shear force increase. The fitting formula of shear strength can predict shear strength under different heat treatment.