Experimental characterization and numerical modelling of the translaminar fracture of woven-ply hybrid fibers reinforced thermoplastic laminates

TL;DR

This paper investigates how initial notch orientation affects translaminar fracture in woven-ply hybrid fiber reinforced thermoplastic PEEK laminates through experiments, digital image analysis, and finite element mesoscale modeling.

Contribution

It introduces a combined experimental and numerical approach to analyze the influence of notch orientation and ply behavior on fracture mechanisms in thermoplastic laminates.

Findings

Critical translaminar fracture toughness is approximately 40 kJ/m².

Initial notch orientation significantly influences fracture energy evolution.

Finite element modeling captures complex damage mechanisms within the laminates.

Abstract

This study was aimed at investigating the influence of initial notch orientation on the translaminar fracture of woven-ply hybrid fibers reinforced thermoplastic polyether ether ketone (PEEK) laminates. This work is based on the experimental characterization of translaminar fracture of Single-edge-notch bending (SENB) specimens with two initial notches (0{\textdegree} and 45{\textdegree}). Such geometry results in a complex stress state within the laminates plies as well as simultaneous tension/compression failures. A digital image analysis technique has been implemented to monitor the crack initiation and growth during mechanical loading. To better understand the role played by the initial notch orientation as well as the plies orientation contribution to fracture behavior, a specific Finite Element mesoscale modelling was built to account for the deformation mechanisms (namely local plasticity) and the different damage behaviours (fiber breakage in tension and compression, kinking/crushing in compression, delamination) occurring within the plies of quasi-isotropic laminates. Linear elastic fracture mechanics concepts have been applied to quantify the critical translaminar fracture toughness (about 40 kJ/m${}^2$ in both cases). Finally, the G-R curves were computed from the compliance method to investigate the influence of the initial notch orientation on the evolution of the fracture energy.