Dynamic ductile fracture
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Date
2023-11
Publication Type
Book Chapter
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yes
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Abstract
Ductile fracture is the main mechanism leading to the formation and propagation of cracks in metallic structures. It is a physical process that involves the large deformation and progressive damage of materials under extreme loading conditions. The prediction of ductile fracture by means of finite element computations requires plasticity models that predict the three-dimensional deformation response of solids. In the case of dynamic loading, the temperature- and rate-dependent mechanisms described in the previous chapter need to be captured through advanced plasticity models. Two distinct approaches to predict ductile fracture are covered here. The first consists of using porous plasticity models in conjunction with coalescence criteria. The second is based on nonporous plasticity models that can be used in conjunction with damage indicator models to predict the initiation of ductile fracture. With a view to analyzing crash and impact problems, the Johnson-Cook plasticity model and its fracture counterpart are discussed. Furthermore, the Lode angle and stress triaxiality sensitive Hosford-Coulomb fracture initiation model is introduced.
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published
Editor
Book title
Dynamic Behavior of Materials
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Volume
Pages / Article No.
51 - 72
Publisher
Elsevier
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Edition / version
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Subject
Ductile fracture; Void nucleation; Growth and coalescence; Stress triaxiality; Lode parameter; Rate- and temperature-dependent plasticity and fracture
Organisational unit
09473 - Mohr, Dirk / Mohr, Dirk