Modeling the Strength Degradation and Fatigue of Carbon Fiber Rein-forced Composites

Abstract

Abstract. Static and fatigue data available in literature concerning carbon fiber reinforced composite laminates subjected tension-tension fatigue were re-elaborated in the framework of a two-parameter fatigue model explicitly accounting for the cyclic as well as the mean stress. The data were used to obtain the model parameters by best fitting procedures. A primitive statistical implementation of the model was based on the hypothesis that the monotonic tensile strength follows a two-parameter Weibull distribution. The model has the potential of being predictive indicating that the fatigue characterization of given laminate can be achieved with a minimum of experimental tests. The model reliability and its applicability limits are discussed.

Numerical Procedures for Damage Mechanisms Analysis in CFRP Composites

“…The impact at low speed can be difficult to identify through a visual inspection of the structure, because the damage is mainly within the laminate. The non-destructive ultrasound technique must be used for the inspection of composite materials, but that method is slow as well as expensive, and technical difficulties can arise with its use [1].…”