Fatigue fracture criterion of composite materials

Fracture Problems in Composite Materials

In this paper a series of fracture problems in composite materials are identified, their methods of solution are briefly discussed, and some sample results are presented. The main problem of interest is the determination of the stress state in the neighborhood of localized imperfections such as cracks and inclusions which may exist in the composite. Particular emphasis is placed on the evaluati...

Failure Study of Composite Materials by the Yeh-Stratton Criterion

The newly developed Yeh-Stratton (Y-S) Strength Criterion was used to study the failure of composite materials with central holes and normal cracks. To evaluate the interaction parameters for the Y-S failure theory, it is necessary to perform several biaxial loading tests. However, it is indisputable that the inhomogeneous and anisotropic nature of composite materials have made their own contri...

Fracture Mechanics Analysis of Composite Microcracking: Experimental Results in Fatigue

A recent variational mechanics analysis gives the energy release rate due to the formation of a new microcrack between two exisiting microcracks (John A. Nairn, J. Comp. Mat., 23, 1106 (1989)). This analysis has been useful in providing fracture mechanics interpretation of matrix microcracking in cross-ply laminates. This paper describes using the new energy relase rate analysis for a fracture ...

A Benchmark on Lifetime Prediction of Composite Materials under Fatigue

The present paper describes a benchmarking programme to compare different lifetime prediction methodologies. Lifetime prediction is still a complex task and the results depend on many factors. Thus, it is very important to know which factors have a decisive effect on the results. The main objective of this investigation is not to proof the validity of a certain prediction model, but to quantify...

A universal fracture criterion for high-strength materials