Residual stiffness and residual strength,as the most common methods to describe the fatigue damage degree of composite materials,have their own advantages and disadvantages in application.The cost of stiffness experiment is low,but the lack of clear failure criterion limits its application in practical engineering.Although there is a natural failure criterion for strength,destructive experiment leads to high cost of experiment.At the same time,it is considered that most composite structures are in service under random alternating loads,such as noise and vibration.In this paper,the residual strength curve under random fatigue is derived from the constant amplitude fatigue data of continuousfiber reinforced composites.A residual stiffness-strength correlated model under random loading is proposed,which reduces the experimental time and cost.The fatigue life of the structure is predicted by the correlated model,and the predicted value is in good agreement with the experimental value.
关键词
复合材料/随机疲劳/剩余强度/剩余刚度/疲劳寿命
Key words
composites/random fatigue/residual stiffness/residual strength/fatigue life
维普
万方数据