The word fatigue has been a widely accepted term in engineering
vocabulary for catastrophic failure of materials under cyclic
loadings for more than a century. Cyclic loading causes damage and
material property degradation in a cumulative manner. When a
structure is subjected to cyclic stress (often much less than the
static yield strength of the material) it fails after a number of
cycles of stress application. Therefore, fatigue is the principal
failure mechanism for structures under cyclic loading. To
demonstrate the fatigue behavior, the composite laminates are
modeled using the Finite Element Method (FEM). Using FEM results
and Tsai-Hill criterion, fatigue life is computed for various
laminate configurations. To validate the results, fatigue life
assessed by Tsai-Hill and Tsai-Wu criteria is compared. The
variations of fatigue life for different support conditions, load
increments and possible lamina stacking sequences are studied. In
addition, to present the fatigue behavior under variable amplitude
loading, the Rainflow counting method is applied on irregular load
history and fatigue life is computed for converted block loading.
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