TY - JOUR
T1 - Generation and propagation analyses of high-strain-rate dynamic crack propagation in a visco-plastic solid
AU - Yoshimura, S.
AU - Yagawa, G.
AU - Atluri, S. N.
N1 - Funding Information:
Part of this work was performed when S. Yoshimura visited the Georgia Institute of Technology during 1985-86. The support of this work by the U.S. office of Naval Research and the encouragement of Dr. Y. Rajapakse are thankfully acknowledged.
PY - 1989/2/1
Y1 - 1989/2/1
N2 - This paper presents a numerical analysis of dynamic crack propagation in a visco-plastic solid. A tangent modulus formulation, based on a uniaxial material characterization in the form σyd = h( ε{lunate} ̄vp, ε{lunate} ̄•vp, is used to take into account the visco-plasticity. A technique of nodal force relaxation is employed for the modeling of continuous dynamic crack propagation. The fracture mechanics parameter studied here is a path independent integral, T*, which is applicable to both quasi-static and dynamic fracture phenomena of non-linear materials, and which has the meaning of an energy-release rate for the case of the specific visco-plastic material studied herein. At first, a numerical simulation of dynamic crack propagation at various values of constant velocity in a visco-plastic solid is carried out to investigate the high-strain-rate effects on the energy release rate, and on the stress-strain fields near the crack tip. Secondly, a generation phase calculation of an experiment performed by Brickstad is carried out to obtain a relationship between the fracture toughness and crack velocity in a visco-plastic solid.
AB - This paper presents a numerical analysis of dynamic crack propagation in a visco-plastic solid. A tangent modulus formulation, based on a uniaxial material characterization in the form σyd = h( ε{lunate} ̄vp, ε{lunate} ̄•vp, is used to take into account the visco-plasticity. A technique of nodal force relaxation is employed for the modeling of continuous dynamic crack propagation. The fracture mechanics parameter studied here is a path independent integral, T*, which is applicable to both quasi-static and dynamic fracture phenomena of non-linear materials, and which has the meaning of an energy-release rate for the case of the specific visco-plastic material studied herein. At first, a numerical simulation of dynamic crack propagation at various values of constant velocity in a visco-plastic solid is carried out to investigate the high-strain-rate effects on the energy release rate, and on the stress-strain fields near the crack tip. Secondly, a generation phase calculation of an experiment performed by Brickstad is carried out to obtain a relationship between the fracture toughness and crack velocity in a visco-plastic solid.
UR - http://www.scopus.com/inward/record.url?scp=0024606789&partnerID=8YFLogxK
U2 - 10.1016/0029-5493(89)90214-8
DO - 10.1016/0029-5493(89)90214-8
M3 - Article
AN - SCOPUS:0024606789
SN - 0029-5493
VL - 111
SP - 273
EP - 289
JO - Nuclear Engineering and Design
JF - Nuclear Engineering and Design
IS - 2
ER -