Details

Autor(en) / Beteiligte

• Shi, Qianyu
• Wang, Zhijian
• Tang, Hui
• Mu, Libo
• Zhao, He
• Bergheau, Jean-Michel
• Jean-Michel Bergheau

Titel

A Ductile Fracture Phase Field Model Based on Strain Rate‐Dependent Fracture Toughness

Ist Teil von

• Modelling and Simulation in Engineering, 2024-06, Vol.2024 (1)

Ort / Verlag

New York: Hindawi Limited

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The numerical simulation of ductile fracture failure plays an important role in the evaluation of the integrity of engineering structures with the development of computing science and technology. As a competitive approach to predict fractures, the phase field model has been developed for about two decades to deal with a variety of crack growth problems. Rate-dependent fracture is an important research interest, and some studies have begun to focus on using phase field method to predict rate-dependent fracture. Such as coupling viscous material constitutive with phase field or defining a rate-dependent fracture toughness within the framework of phase field models. In this paper, a ductile fracture phase field model based on strain rate-dependent fracture toughness is presented to describe the rate-dependent mechanical response in elastoplastic materials such as metallic alloys. The fracture toughness is defined as a power function of the plastic strain rates, which can make a more flexible control of the rate-dependent behavior of ductile fracture compared with the existing phase field methods. Additionally, a total energy density threshold is introduced to ensure a real stress-strain response of elastoplastic materials prior to crack growth. Several numerical examples are conducted to illustrate the effectiveness of this model.