Deformation and Failure of OFHC Copper under high strain rate shear compression
Paper i proceeding, 2017

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.

Författare

Andrew Ruggiero

Universita di Cassino e del Lazio Meridionale

Gabriel Testa

Universita di Cassino e del Lazio Meridionale

Nicola Bonora

Universita di Cassino e del Lazio Meridionale

G. Iannitti

TECHDYN Engineering

Italo Peresechino

Universita di Cassino e del Lazio Meridionale

Magnus Hörnqvist Colliander

Chalmers, Fysik, Materialens mikrostruktur

AIP Conference Proceedings

0094-243X (ISSN) 1551-7616 (eISSN)

100007

Ämneskategorier

Maskinteknik

Annan materialteknik

Styrkeområden

Materialvetenskap

DOI

10.1063/1.4971632

ISBN

978-073541457-0