Deformation and Failure of OFHC Copper under high strain rate shear compression

Hat-shaped specimen geometries were developed to generate high strain, high-strain-rates deformation under prescribed conditions. These geometries offer also the possibility to investigate the occurrence of ductile rupture under low or negative stress triaxiality, where most failure models fail. In this work, three tophat geometries were designed, by means of extensive numerical simulation, to obtain desired stress triaxiality values within the shear region that develops across the ligament. Material failure was simulated using the Continuum Damage Model (CDM) formulation with a unilateral condition for damage accumulation and validated by comparing with quasi-static and high strain rate compression tests results on OFHC copper. Preliminary results seem to indicate that ductile tearing initiates at the specimen corner location where positive stress triaxiality occurs because of local rotation and eventually propagates along the ligament.

Testa, GabrielUniversita di Cassino e del Lazio Meridionale (author)
Bonora, NicolaUniversita di Cassino e del Lazio Meridionale (author)
Iannitti, G. (author)
Peresechino, ItaloUniversita di Cassino e del Lazio Meridionale (author)
Hörnqvist Colliander, Magnus,1979Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)magnuh (author)
Universita di Cassino e del Lazio MeridionaleChalmers tekniska högskola (creator_code:org_t)

By the author/editor: Ruggiero, Andrew; Testa, Gabriel; Bonora, Nicola; Iannitti, G.; Peresechino, Ita ...; Hörnqvist Collia ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Other Materials ...

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