Abstract
In this study, the thermal oxidative ageing effect of carbon fiber/epoxy plain woven composites are investigated by a hierarchical multiscale model. The deterioration of structural integrity caused by interface cracks in both micro- and macroscale, incorporated with mechanical property degradation in the matrix has been considered in the model. It is shown that the interface cracks and matrix degradation have an obvious influence on the transverse and shear properties of the microscale model and the accumulation of interface and matrix degradation in the microscale also leads to the reduction of mechanical property in the mesoscale model, especially under shear loading. At the macroscale, both experimental and numerical results report different failure modes between the pristine and aged specimen under short beam shear loading. The finite element model indicates that interlaminar cracks formed in thermal ageing play an important role in delamination failure.
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