A variational phase-field framework for thermal softening and dynamic ductile fracture

Torres, David E.; Hu, Tianchen; Stershic, Andrew J.; Shelton, Timothy R.; Dolbow, John E.

doi:10.1016/j.cma.2024.117452

Title: A variational phase-field framework for thermal softening and dynamic ductile fracture

Journal Article · 27 October 2024 · Computer Methods in Applied Mechanics and Engineering

DOI: https://doi.org/10.1016/j.cma.2024.117452 · OSTI ID:2475737

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Duke Univ., Durham, NC (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

A variational phase field model for dynamic ductile fracture is presented. Here, the model is designed for elasto-viscoplastic materials subjected to rapid deformations in which the effects of heat generation and material softening are dominant. The variational framework allows for the consistent inclusion of plastic dissipation in the heat equation as well as thermal softening. It employs a coalescence function to degrade fracture energy during regimes of high plastic flow. A variationally consistent form of the Johnson–Cook model is developed for use with the framework. Results from various benchmark problems in dynamic ductile fracture are presented to demonstrate capabilities. In particular, the ability of the model to regularize shear band formation and subsequent damage evolution in two- and three-dimensional problems is demonstrated. Importantly, these phenomena are naturally captured through the underlying physics without the need for phenomenological criteria such as stability thresholds for the onset of shear band formation.

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Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525

OSTI ID:: 2475737

Report Number(s):: SAND--2024-15037J

Journal Information:: Computer Methods in Applied Mechanics and Engineering, Journal Name: Computer Methods in Applied Mechanics and Engineering Journal Issue: A Vol. 433; ISSN 0045-7825

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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