A GENERAL CRITERION FOR HIGH CYCLE MULTIAXIAL FATIGUE FAILURE |
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| Authors: | D. L. McDiarmid |
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| Affiliation: | Department of Mechanical Engineering and Aeronautics, City University, London EC1V 0HB, England |
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| Abstract: | Abstract— A new simple general criterion of failure for high cycle multiaxial fatigue, τa/ t A.B+σn. max/2σT= 1 presented. The failure criterion is based on a critical plane approach where fatigue strength is a function of the shear stress amplitude and the maximum normal stress on the critical plane of maximum shear stress amplitude. The criterion takes account of whether case A cracks, growing along the surface, or case B cracks, growing into the surface, occur. It requires knowledge of the material properties, tensile strength, σT, and reversed shear fatigue strength for case A, t A, or case B, t B, cracking, whichever is relevant. t A is the reversed torsion fatigue strength and t B is found from a case B cracking test case. The criterion is applicable in the region, 0.5 t ≤ t a≤ t , and 0 ≤σn.max≤σT. |
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