Low-cycle Fatigue In Welds

Author:  Miller, W.R. and Amin, H.S.
Source:  SESA, Vol. XXXII, No. 1
Doc ID:  1975013
Year of Publication:  1975
Abstract:  
Hour glass shaped specimens were made from ASTM A-516 grade 55, steel plates which had been welded together. The specimens were manufactured so that the weld material was at the minimum section. the Specimens were strain cycled about zero mean strain and the results were compared with tests conducted on specimens taken from the parent material. When the ttal strain range vs. cycles to failure was plotted on log-log coordinates, the curves for both the welded and parent material specimens had nearly the same slope; however, the curve for the welded specimens was displaced downward from that of the parent material. Thus, for a given strain range the parent material specimens had lives approximately six times greater than the welded specimens.