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Fatigue Failure Model for Fibre-Reinforced Materials under General Loading Conditions

F. Ellyin

University of Alberta, Dept. of Mechanical Engineering, 4-9 Mechanical Engineering Building, Edmonton, Alberta, Canada, T6G 2G8

A new model is presented which predicts the fatigue failure of fibrereinforced materials (FRM's) under multiaxial stresses, varying minimum to maximum cyclic stress ratios and different fibre orientations with respect to the loading directions. The concept of multidirectional elementary blocks is introduced. The model predicts the fatigue failure of these and unidirectional elementary blocks, based on the establishment of a reference stress versus life line and the determination of two simple functions. This methodolgy reduces considerably the number of parameters to be determined experimentally. Correlation with published fatigue failure results is presented. It is shown that the model succeeds in accurately predicting fatigue failure of different unidirectional and bidirectional FRM's subjected to uniaxial and biaxial stresses and different minimum to maximum cyclic stress ratios.

Journal of Composite Materials, Vol. 28, No. 15, 1432-1451 (1994)
DOI: 10.1177/002199839402801503


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