Viscoplastic finite element analysis of rapid fracture

Hoff, R.; Rubin, Carol; Hahn, G. T.

doi:10.1016/0013-7944(87)90025-7

Cited by 16 publications

(2 citation statements)

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“…Subsequently the straining leading to crack growth by void coalescence is rather localized, and here an essentially constant crack tip opening angle is predicted in each case. This seems to support the type of crack growth criterion applied by Hoff et al [6], where quasi-static COD versus Aa results were used for the initial part of growth, while a fixed critical value of the crack tip opening angle was used subsequently. For the reference material investigated here the critical value of this angle is about 7 deg when plastic flow is contained, but for the small specimen (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…These authors find that even for a high-strength steel the effect of crack tip plasticity is significant, so that a conventional elastodynamic analysis is not sufficient. In a viscoplastic finite element analysis of dynamic crack growth carried out by Hoff et al [6] good qualitative agreement with experiments has been obtained by using crack-tip-opening displacement versus crack advance results for slow growth in the initial part, and subsequently using a fixed critical value of the crack-tip-opening angle as the fracture criterion.…”

Section: Introductionmentioning

confidence: 90%

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An analysis of dynamic, ductile crack growth in a double edge cracked specimen

1991

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Dynamic crack growth is analysed numerically for a plane strain double edge cracked specimen subject to symmetric impulsive tensile loading at the two ends. The material behavior is described in terms of an elastic-viscoplastic constitutive model that accounts for ductile fracture by the nucleation and subsequent growth of voids to coalescence. Two populations of second phase particles are represented, including large inclusions or inclusion colonies with low strength, which result in large voids near the crack tip at an early stage, and small second phase particles, which require large strains before cavities nucleate, The crack growth velocities determined here are entirely based on the ductile failure predictions of the material model, and thus the present study is free from ad hoe assumptions regarding appropriate dynamic crack growth criteria. Adiabatic heating due to plastic dissipation and the resulting thermal softening are accounted for in the analyses. Different prescribed impact velocities, inclusion spacings and values of the inclusion nucleation stress are considered. Predictions for the dynamic crack growth behavior and for the time variation of crack tip characterizing parameters are obtained for each case analyzed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 90%