A shear-modified cohesive-GTN model for shear failure at high strain rates

Cohesive zone model is an effective tool for predicting the interface behaviors in materials. However, it is usually defined by the separation without considering the micro-voids nucleation, growth and coalescence in ductile materials. In this work, a cohesive-GTN model is extended to investigate du...

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Bibliographic Details
Published in:Meccanica (Milan) 2023-10, Vol.58 (10), p.2033-2049
Main Authors: Gu, Tao, Wang, Zhanjiang, Ran, Pengfei
Format: Article
Language:English
Subjects:
Automotive Engineering
Axial stress
Civil Engineering
Classical Mechanics
Cohesion
Constitutive models
Engineering
Failure
Finite element method
High strain rate
Mathematical models
Matrix materials
Mechanical Engineering
Nucleation
Shear strain
Waveforms
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Summary:Cohesive zone model is an effective tool for predicting the interface behaviors in materials. However, it is usually defined by the separation without considering the micro-voids nucleation, growth and coalescence in ductile materials. In this work, a cohesive-GTN model is extended to investigate ductile failure at low triaxiality, building on the shear-modified Gurson-Tvergaard-Needleman model. The extended model is implemented into finite element code Abaqus/Explicit via a VUEL subroutine to facilitate its application. Moreover, to illustrate the hardening behaviors of matrix materials under high strain rates, an improved Khan-Huang-Liang constitutive model is developed. The availability of the extended cohesive zone model is calibrated and validated by comparing strain waveforms and fracture morphologies to those obtained from experiments using two types of hat-shaped specimens under different shear strain rates. The numerical results demonstrate that the shear-modified cohesive-GTN model can efficiently describe and predict ductile failure behaviors at low triaxiality.
ISSN:0025-6455
1572-9648
DOI:10.1007/s11012-023-01715-9