Abstract
Three-dimensional Finite Element Analyses of pre-cracked small punch test (p-SPT) specimens are performed to evaluate plastic constraint factor (m). The m factor is useful to correlate the J-integral with the crack tip opening displacement (CTOD). The through-thickness square pre-cracked specimen is analyzed for this purpose. Parametric studies are carried out by varying the crack length, the material yield strength and the strain hardening coefficients. Based on the computed results, two new J-CTOD correlations are proposed. These are (a) a correlation as a function of the crack length (a/W) and the yield to tensile strength ratio (σYS/σUTS) and (b) another correlation as a function of the crack length (a/W), the yield to tensile strength ratio (σYS/σUTS) and the current applied loading expressed in terms of load-line-displacement/crack length (LLD/a). The second correlation is more versatile. However, it is applicable only for the present geometry. The predicting capabilities of the correlations are checked by comparing the calculated values with the computed results.
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