A multi-phase-field model for fiber-reinforced composite laminates based on puck failure theory

TL;DR

This paper introduces a multi-phase-field model based on Puck failure theory to predict failure in fiber-reinforced composite laminates, accurately capturing damage modes and interrelations through a multi-field approach.

Contribution

It develops a novel two-dimensional multi-field model with mesh overlay for in-plane damage prediction in FRC laminates considering fiber and inter-fiber failure modes.

Findings

Model accurately predicts failure modes in various laminate configurations.

Demonstrates strong agreement with experimental results in multiple benchmark tests.

Effectively distinguishes between fiber and inter-fiber damage mechanisms.

Abstract

This article proposes a multi-phase-field model using the Puck failure theory to predict the failure in fiber-reinforced composites (FRCs) laminates. Specifically, this work proposes a two-dimensional multi-field model in conjunction with a mesh overlay method to compute in-plane damage in the FRCs laminates with various ply orientations. The formulation considers the two independent phase-field variables to trigger fiber and inter-fiber-dominated failure separately, thereby accessing the interrelation between the damage. Furthermore, the model considers two characteristic length scales and two structural tensors to describe the damage modes accurately. Each ply in the laminate is represented using a separate mesh and is combined using the mesh overlay method. Four benchmark examples are utilized to demonstrate the predictive capability of the proposed model. Specifically, coupon tests in tensile and compressive loading, open-hole tension, compact tension, and double-edged notched tension examples are presented along with the comparison with the experimental results from the literature. Furthermore, results regarding cross-ply laminates and isotropic laminates show the model's ability to mimic the experimental results both qualitatively and quantitatively.