A mixed phase-field fracture model for crack propagation in punctured EPDM strips

TL;DR

This paper combines experimental crack propagation analysis in punctured EPDM strips with a novel mixed phase-field fracture model to improve simulation accuracy for nearly incompressible materials.

Contribution

It introduces a mixed form phase-field fracture model that reduces volume-locking effects, specifically tailored for crack propagation in punctured EPDM rubber.

Findings

Good agreement between experimental and numerical crack paths

Enhanced simulation accuracy for nearly incompressible materials

Identification of critical strain energy release rate

Abstract

In this work, we present crack propagation experiments evaluated by digital image correlation (DIC) for a carbon black filled ethylene propylene diene monomer rubber (EPDM) and numerical modeling with the help of variational phase-field fracture. Our main focus is the evolution of cracks in one-sided notched EPDM strips containing a circular hole. The crack propagation experiments are complemented with investigations identifying the mechanical material properties as well as the critical strain energy release rate. For simulating the evolution of cracks with a given notch, phase-field fracture modeling is a popular approach. To avoid volume-locking effects considering fractures in nearly incompressible materials, a quasi-static phase-field fracture model in its classical formulation is reformulated with the help of a mixed form of the solid-displacement equation. The new established mixed phase-field fracture model is applied to simulate crack propagation in punctured EPDM strips by using the experimentally identified material parameters with mixed finite elements. To discuss agreements and point out challenges and differences, the crack paths, the maximal force response, the traverse displacement at the crack start, as well as force-displacement curves of the experimental and numerical results are compared.