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