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| Main Authors: | , , , |
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| Format: | Artículo Open Access |
| Published: |
Wiley
2025
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| Subjects: | |
| Online Access: | https://4spepublications.onlinelibrary.wiley.com/doi/10.1002/pc.29652 |
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Table of Contents:
- An experimental methodology to characterize the multiaxial failure of short‐fiber reinforced thermoplastics Martijn Wismans Lambèrt C. A. van Breemen Leon E. Govaert Tom A. P. Engels Polymer Composites Abstract In this study, an experimental approach is presented to determine strain‐based failure envelopes for short‐fiber reinforced thermoplastics under multiaxial loading conditions. The multiaxial failure behavior is experimentally investigated by Nakajima puncture tests that, via geometrical variations, allow the change of the stress state from uniaxial to biaxial. Local failure initiation can be mostly not identified by the macroscopic force–displacement curve. Instead, failure is assessed using 3D digital image correlation (3D DIC), which is used to measure the local strain and determine local failure. The methodology is demonstrated for systems with a ductile (polypropylene), pseudo‐ductile (polycarbonate), and brittle (polyphenylene sulfide) matrix. The shape of the failure envelopes is found to be very similar for most of the systems and shown to be governed by a critical strain parallel and perpendicular to the main fiber direction. The magnitude of the critical strains varies widely between the various systems and depends on the reinforcing constituent (e.g., fiber volume fraction), matrix characteristics (e.g., yield stress), and the addition of impact modifiers, as illustrated for the reinforced thermoplastics studied. The determined critical strain can be straightforwardly used to predict failure for complex products under multiaxial loading conditions. Highlights Characterization of multiaxial failure for short‐fiber reinforced thermoplastics The local failure envelope is found to be very similar for most systems studied. Failure is governed by a critical strain in two material directions. 10.1002/pc.29652 http://creativecommons.org/licenses/by/4.0/