Abstract
In this paper, instrumented impact test results obtained using V-notch and precracked Charpy specimens of AISI 308 weld and AISI 316 stainless steels are analysed for determining the plastic η-factor for three-point bend specimens used in J-integral evaluation. Tested 316 stainless steel specimens were in various thermal aging/cold-work conditions whereas 308 weld specimens were in the as-welded condition. The results are analysed using the various procedures proposed in the literature and compared with experimental and finite element results reported in the literature. Based on our analysis, two polynomial expressions of a/W for ηpl are presented: one gives a sort of upper-bound in the a/W range 0.05–1.0 while the other gives conservative values (i.e., use of this results in J-R curves and J sufficiently conservative for engineering purposes). Both provide a smooth variation of ηpl over the entire a/W range unlike some of the expressions given in the literature which show a discontinuous change at an intermediate a/W.
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Sreenivasan, P., Mannan, S. Plastic n-factor for three-point bend specimens: Analysis of instrumented Charpy impact test results for AISI 308 weld and AISI 316 stainless steels. International Journal of Fracture 101, 215–228 (2000). https://doi.org/10.1023/A:1007686321002
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DOI: https://doi.org/10.1023/A:1007686321002