Numerical simulation of fiber-matrix debonding in single fiber pull-out tests

  • Lukas Hoppe Lehrstuhl für Technische Mechanik, Universität Paderborn and Institute of Composite Structures, German Aerospace Center, Braunschweig
Keywords: interface modeling, single fiber pull-out test, fiber reinforced plastics, peridynamic, finite elemente method, cohesive zone model, glass fiber, epoxy

Abstract

The present work deals with the numerical crack simulation of fiber-matrix debonding in single fiber pull-out tests. For this purpose, two models are used: a finite element model (FE model) with the cohesive zone approach and a peridynamic model. For calibration a reference experiment is applied. In addition analytical equations are used for reference values. The influence of the model parameters and the material parameters of the cohesive zone model on the force-displacement curve is investigated. Besides the free fiber length, the critical interface strength, the critical energy release rate as well as the initial interface stiffness have a great influence on the force-displacement curve of the pull-out test. From the crack simulation it can be seen that Mode I has an influence on the crack initiation, but further crack growth after initiation is dominated by Mode II. The FE model can be calibrated in a way that the crack initiation point and the maximum force correspond to the reference experiment. The peridynamic model depicts a comparable crack formation process.

Author Biography

Lukas Hoppe, Lehrstuhl für Technische Mechanik, Universität Paderborn and Institute of Composite Structures, German Aerospace Center, Braunschweig

M.SC. Mechanical Engineering at University Paderborn
Research interests including numerical simulation of fiber reinforced composites.

 

Published
2020-12-10
How to Cite
Hoppe, L. (2020). Numerical simulation of fiber-matrix debonding in single fiber pull-out tests. GAMM Archive for Students, 2(1), 21-35. https://doi.org/10.14464/gammas.v2i1.437
Section
Research Articles