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Determination of fracture toughness by uniaxial tensile test
Determination of fracture toughness by uniaxial tensile test
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机译：通过单轴拉伸试验确定断裂韧性
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摘要
The technical field of the present invention relates to the identification of mechanical properties of a material and a test method thereof. A technical problem to be solved is that ASTM E399, which is a current fracture toughness measuring method, is very difficult to prepare a test piece and its measurement value is not stable. It is measured using a tensile test that provides a simple and stable measurement of the test.;The gist of the present invention is to use a static life equation of a material to calculate the number of elapsed days already during a small Al interval (dt) and to apply the bar to integrate the lifetime of the material throughout the lifetime of the material, The inventors of the present invention invented that the surface energy per unit area of complete brittle fracture is equal to the surface energy per unit area multiplied by the ratio of the elongation at break point to the elastic strain at tensile strength in the tensile test.;An important application of the present invention is not only a breakthrough easy and accurate method of obtaining fracture toughness but also a breakthrough in the calculation of the stress intensity factor in fracture mechanics and pressure vessel structural dynamics calculations.
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