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The macroscopic and microscopic appearance of fatigue fracture surfaces is strongly affected by the prevailing stress intensity conditions at the moving crack tip. The nature of the fatigue striation found during plane strain propagation is examined and crystallographic considerations introduced to explain different topographical striation arrangements. Program loading studies reveal the importance of stress intensity factor range and maximum or mean values in the determination of striation spacing. Evidence of fatigue damage accumulation is presented. “Elongated dimples” found in the plane stress region of crack propagation are not related to stress intensity conditions or macroscopic growth rate.
fatigue (materials), crack propagation, fracture surface, striations, plane strain, plane stress, microstructure
Hertzberg, R. W.
Assistant professor, Lehigh University, Bethlehem, Pa.