Bifurcation and neck formation as a precursor to ductile fracture during high rate extension
- Brown Univ., Providence, RI (United States)
A block of ductile material, typically a segment of a plate or shell, being deformed homogeneously in simple plane strain extension commonly undergoes a bifurcation in deformation mode to nonuniform straining in the advanced stages of plastic flow. The focus here is on the influence of material inertia on the bifurcation process, particularly on the formation of diffuse necks as precursors to dynamic ductile fracture. The issue is considered from two points of view, first within the context of the theory of bifurcation of rate-independent, incrementally linear materials and then in terms of the complete numerical solution of a boundary value problem for an elastic-viscoplastic material. It is found that inertia favors the formation of relatively short wavelength necks as observed in shaped charge break-up and dynamic fragmentation.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- OSTI ID:
- 569669
- Report Number(s):
- CONF-9705121-; ON: DE98000902; TRN: 98:009308
- Resource Relation:
- Conference: 15. symposium on energy engineering sciences, Argonne, IL (United States), 14-16 May 1997; Other Information: PBD: 1997; Related Information: Is Part Of Proceedings of the fifteenth symposium on energy engineering sciences; PB: 285 p.
- Country of Publication:
- United States
- Language:
- English
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