J - A fracture concept based on the three
نویسنده
چکیده
A three-term asymptotic expansion which is controlled by two amplitude parameters is used to describe the stress field in the vicinity of the crack tip in a power-hardening material. The first parameter is the well-known J-integral. The second parameter (amplitude A) can be interpreted as a geometry constraint parameter. A least square procedure is developed for the determination of the amplitude parameter A by fitting of finite element data. The weakest link model is applied to the prediction of geometry dependence of the fracture toughness JC . The geometry dependence of JC/JIC is obtained for typical specimens as a function of the crack length and applied load. The weakest link prediction of fracture toughness for three-point bend specimens with cracks of different length is compared with experimental data.
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