A Continuum Damage Mechanics Model for Multiaxial Low Cycle Fatigue Life

概要

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A continuum damage mechanics model for low cycle fatigue failure of initially isotropic materials under multiaxial loading is presented. The expression for the equivalent strain in the fatigue damage evolution equation contains the three material parameters and the strain intensity as well as two principal strains for amplitudes. It is shown how these material parameters can be determined from a series of basic experiments proposed in this paper. Particular expressions for the equivalent strain with a smaller number of material parameters and invariants are obtained. Model results are found to be in satisfactory agreement with the experimental low cycle fatigue data under full ranged multiaxial loadings obtained in the test using a cruciform specimen.
福井大学工学部の論文