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本文通过量纲理论和数值分析,推导出一个关于在测试平面应变K_(IC)时试件最小厚度B的新判据——B≥1880(K_I)_C~2/E~(4I3)(σ_Y)~(2I3)。新判据与美国材料试验学会(ASTM)给出的判据B≥2.5(K_(IC)/σ_r)~2及 J.C.Ritter给出判据B≥400(K_I)_C~2/Eσ_r均出自同一组试验数据。通过三者之间的比较可强度钢来说,新厚应判据比另外二以得出结论:对于高强度钢和超高判据更合适些。
Based on dimensional theory and numerical analysis, a new criterion for determining the minimum thickness B of specimen in the test of plane strain K_ (IC) is deduced - B≥1880 (K_I) _C ~ 2 / E ~ (4I3) (σ_Y ) ~ (2I3). The new criterion and the criterion given by American Society for Testing and Materials (ASTM) B≥2.5 (K_ (IC) / σ_r) ~ 2 and JCRitter give criterion B≥400 (K_I) _C ~ 2 / Eσ_r are all from the same Group test data. By comparing between the three steerable steels, the new thickening criterion is more conclusive than the other two: it is more appropriate for high strength steels and very high steels.