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Intermittent annealing of oxygen-free high-conductivity copper is used to investigate the accumulation of low-cycle fatigue damage under total diametral strain control. Cyclic strain-induced cold work can be removed independently of the number of prior strain cycles or annealing periods. Specimens with frequent intermittent annealing have slightly extended fatigue lives instead of reductions in life predicted on the basis of the Manson-Coffin relation.
Frequent rest periods at mildly elevated temperature reduce the cyclic plastic strain and retard the fatigue damage process in mild steel tested under axial stress control. Fatigue life may be increased by a factor of 100 as a result of treatments applied every 1 percent of the estimated life. The Manson-Coffin relation accurately predicts the prolongation of fatigue life in this case.
fatigue (materials), annealing, precipitation hardening, axial stress, fatigue life, plastic deformation, metals, cold working, evaluation
Assistant professorPersonal member ASTM, College of Engineering, University of Wisconsin, Madison, Wis.