Analysis of the microbond test using nonlinear fracture mechanics

TL;DR

This paper uses nonlinear finite element analysis to examine the assumptions behind microbond tests, which are used to evaluate the interfacial shear strength in fiber reinforced composites.

Contribution

It introduces a nonlinear fracture mechanics approach to assess the validity of uniform stress assumptions in microbond testing.

Findings

Nonlinear analysis reveals deviations from uniform stress assumptions.

The study provides insights into the interfacial shear strength measurement.

Results suggest improvements in microbond test interpretation.

Abstract

Microbond tests composed of single fibre and matrix droplet are often used to determine the properties of fibre reinforced composites. Interfacial shear strength is quantified by the maximum pull-out force assuming a uniform stress distribution along the fibre. Here, nonlinear finite element analyses are performed to investigate the validity of this assumption.