Residual Stiffness-Residual Strength Correlated Model and Life Prediction of Composite Materials under Random Fatigue Loading
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.
compositesrandom fatigueresidual stiffnessresidual strengthfatigue life
万方数据
维普
