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Low-cycle fatigue in welds

The lives of parent and welded specimens of ASTM A-516, grade 55, steel plate are compared

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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 total 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 parentmaterial specimens had lives approximately six times greater than the welded specimens.

Two-level cumulative-damage tests on the welded specimens indicate that using Σn/N=1.0 is reasonably accurate.

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Abbreviations

ɛpr :

plastic strain range

ɛtr :

total strain range

ɛf :

fracture ductility

n :

actual cycles

N :

cycles to failure

nH :

number of cycles at the high-strain range

nL :

number of cycles at the low-strain range

a, C :

material constants

References

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Authors and Affiliations

  1. The University of Toledo, 43606, Toledo, OH

    W. R. Miller (Professor of Mechanical Engineering and Graduate Assistant) & H. S. Amin (Professor of Mechanical Engineering and Graduate Assistant)

Authors
  1. W. R. Miller
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  2. H. S. Amin
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Miller, W.R., Amin, H.S. Low-cycle fatigue in welds. Experimental Mechanics 15, 230–233 (1975). https://doi.org/10.1007/BF02319428

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  • DOI: https://doi.org/10.1007/BF02319428

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