径路独立積分T^*を用いた粘塑性体中の高速き裂進展解析

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This paper presents the numerical analyses of dynamic crack propagation in visco-plastic solids. A tangent modulus formulation based on σ_<yd>=h(ε^^-^<vp>,ε^^<-^^・>^<vp>) is used to take into account visco-plasticity. A linear relaxation technique of nodal forces is also employed for the modeling of continuous dynamic crack propagation. The fracture mechanics parameter calculated here is a path independent integral, T*, which is applicable to both quasi-static and dynamic fracture phenomena of non-linear materials. First, a parametric calculation of dynamic crack propagation at a constant velocity in a visco-plastic solid is performed to investigate the high-strain-rate effects on the T* integral and the stress-strain fields near the crack tip. Secondly, a generation phase calculation of an experiment performed by Brickstad is carried out to obtain a relationship between a fracture toughness and a crack velocity.
一般社団法人日本機械学会の論文
1988-02-25