Abstract
In the previous papers, the authors proposed the β-value as the constraint coefficient due to the plate thickness.The purposes of this paper to find analytically the relation between the β-value and thickness B and to evaluate the Jc-value and critical COD, φ0c for any thickness specimen by using the β-B relation, respectively.Stress distributions in the thickness direction are estimated, using the results of calculation by the three dimensional elastic FEM and the Prantl's experimental data, to make a analysis of the relation between β and B.From this study, following conclusions are obtained :1) The β-values evaluated by this analysis display good agreement with the experimental results shown in the previous paper.2) It is expected that the Jc-value and φ0c for any thickness specimen are able to be calculated by formulas proposed this paper considering the thickness effects on the fracture toughness by using a known Jc-value and φ0c for a standard thickness specimen.
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