A new phenomenological creep residual strength model for the life prediction of the laminated composites

Abstract

Fiber-reinforced plastics have extensive applications in advanced industries in which the material is subjected to long time sustained loadings that stimulates time-dependent damage development in laminated composites. In the present article, a new phenomenological residual strength model is proposed for unidirectional composites under sustained loading. A normalization technique is suggested, which accumulates the spread residual strength data, and a power-law model is developed to describe the normalized residual strength data under arbitrary states of stress and sustained times. Accelerated creep experiments were performed on T300/L20 carbon/epoxy unidirectional laminates. The residual strength data of tested T300/L20 unidirectional laminates and available data in the literature for Kevlar/epoxy and S-glass/ epoxy strands are used to examine the model predictions. It is shown that the presented normalization procedure is an effective way for modeling the residual strength of unidirectional composites, and the model can discriminate the rate of damage growth under various stress states.

Fatigue life prediction of high‐speed train bearings based on the generalized linear cumulative damage theory

“…The acquisition of the component residual strength after long service could ensure its carrying capacity. 26,27 Gatts et al 28,29 proposed a generally fatigue cumulative damage theory, which has been verified by the fatigue data under constant amplitude and random loading. Yang et al 30 incorporated the scatter factor into cumulative damage analysis through the residual strength method.…”

“…Residual strength prediction is the case of structures designed and certified against cyclic loading. The acquisition of the component residual strength after long service could ensure its carrying capacity 26,27 . Gatts et al 28,29 proposed a generally fatigue cumulative damage theory, which has been verified by the fatigue data under constant amplitude and random loading.…”

Simulation of tensile fatigue crack propagation in carbon fiber unidirectional laminates under progressive fatigue damage model

“…The robustness of the fatigue model can be tested only when a two-parameter phenomenological model of maximum cyclic stress and stress ratio is established through fatigue phenomenology, and the response characteristics and fixed parameters of composite materials are described at the same time. sayed Sina Samareh-Mousavi and Fathollah Taheri-Behrooz [8] propose a new residual strength model for unidirectional composites under continuous loading. A normalization method is proposed to sum the scattered residual strength data, and a power law model is established to describe the normalized residual strength data under arbitrary stress states and durations.…”