動的弾塑性破壊試験における経路独立T^*積分の解析

概要

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Recently, the authors have derived new types of path independent integrals in which the theoretical limitations of the so-called J integral are overcome. For elastodynamic crack problems, a path independent J' integral which has the physical meaning of the energy release rate was derived. Later, the J' integral was extended to a more general form of path independent integral T* which is valid for any constitutive relation under quasi-static as well as dynamic conditions. In this paper, the T^* integral in a compact tension (CT) specimen for elastoplastic dynamic fracture testing was analysed using an efficient nonlinear dynamic finite element method. The T^* integral exhibits excellent path independency despite the impact loading and large plastic deformations. This indecates the validity of the T^* integral as a fracture parameter in nonlinear dynamic fracture mechanics. This paper also shows the possibility of experimental measurement of the T^* integral.
一般社団法人日本機械学会の論文
1988-02-25