引張特性による金属材料の破壊靱性の簡便評価法

概要

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It is well known that the K_<IC> test for determining static strength is not only very complicated compared with the tensile test but also very sensitive to specimen dimensions. For this reason the J_<IC> test, which is not easy to perform, is often used thus it is desirable to establish a simple method for evaluating fracture toughness. In this study, we investigated the fracture toughness test by the unloading compliance method, and proved a method for estimating of fracture toughness by utilizing the tensile properties of metallic materials. In both methods, we used six kinds of steel, one titanium alloy and three aluminium alloys turned in the optional rolling direction (L-T, T-L). The following relation was observed between plane strain fracture toughness K_<IC> and the uniaxial tensile properties obtained from JIS14A tensile specimens in rolled steels and non-ferrous metals. K_<IC>=0.178[numerical formula]-4.0 (E : Young's modulus. σ_r : True fracture stress, ε_f : Fracture strain). It is possible to evaluate K_<IC> within an estimated error of ±7%.
社団法人日本機械学会の論文
1997-07-25