## Abstract

Recently the authors have derived various new types of path independent integrals in which the theoretical limitations of the so-called J integral are overcome. First, for elastodynamic crack problems, a path independent integral J′ which has the physical meaning of energy release rate was derived. Later, more general forms of path independent integrals T^{*} and T were derived, which are valid for any constitutive relation under quasi-static as well as dynamic conditions. This paper presents the theoretical and computational aspects of these integrals, of relevance in non-linear dynamic fracture mechanics. An efficient solution technique is also presented for non-linear dynamic finite element method in which a factorization of the assembled stiffness matrix is done only once throughout the computation for a given mesh pattern. Finite element analyses were carried out for an example problem of a center-cracked plate subject to a uniaxial impact loading. The material behavior was modeled by three different constitutive relations such as linear-elastic, elastic-plastic, elastic-viscoplastic cases. The applicability of the T^{*} integral to non-linear dynamic fracture mechanics was shown with the numerical results.

Original language | English |
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Pages (from-to) | 331-342 |

Number of pages | 12 |

Journal | Computational Mechanics |

Volume | 3 |

Issue number | 5 |

DOIs | |

State | Published - Sep 1988 |