Macroscopic Fatigue Failure Theories for Multiaxial Stress States

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Abstract

The static and fatigue behaviors of composite laminates depend on the applied loading and the resulting stress state. Simple and fast uniaxial experiments can characterize the material under such loading. However, the situation is much more complicated when complex stress states develop in the material. The setting up and realization of multiaxial experimental programs are complicated and the results not very reliable. Therefore, it is necessary to establish methods that can simulate the multiaxial fatigue behavior of composite laminates and estimate their fatigue life under complex stress states. This chapter focuses on the presentation of available macroscopic fatigue failure theories that take into account the synergistic effect of all stress tensor components on the strength and fatigue life of the examined material. A comparison of the predictive ability of the examined fatigue theories is also presented based on data from Chap. 2, and other data found in the literature.