循环载荷作用下简支梁的损伤演化及刚度分析

Damage Evolvement and Stiffness Analysis of Simply Supported Beams Under Action of Cyclic Loading

基于非线性疲劳累积损伤演化模型和连续损伤理论,考虑损伤产生的阈值应变,建立了疲劳累积损伤是由当前应变状态和加载次数共同影响的损伤模型,通过实验数据确定疲劳累积损伤演化模型参数,验证了模型的合理性。利用ABAQUS软件实现了与加载次数和变形相关的疲劳累积的损伤演化模拟,并且对简支梁进行了三点弯曲疲劳仿真计算;考虑损伤沿着损伤层厚度方向线性分布的情况下,分别对含有单边损伤和双边损伤梁的弯曲刚度进行了研究。

Based on the nonlinear fatigue cumulative damage evolution model and continuous damage theory,considering the threshold strain of damage's genration,a damage model is established,in which the fatigue cumulative damage is affected by the current strain state and loading times.The parameters of fatigue cumulative damage evolution model are determined by using the experimental data,and the rationality of the model is verified.The damage evolution simulation of fatigue accumulation related to loading times and deformation is realized via ABAQUS software,and the fatigue simulation calculation of three-point bending simply supported beams is carried out.Considering the linear distribution of damage along the thickness direction of the damaged layer,the bending stiffness of beams with unilateral damage and bilateral damage are studied respectively.