Abstract
This paper investigates the in-plane shear behavior of spread-tow woven structured flax fiber-reinforced polypropylene composites, focusing on temperature and displacement rate effects. For this aim, the study includes bias-extension experiments to characterize the shear behavior of the material. Several experiments were conducted at different displacement rates and temperature levels. The temperature levels were chosen to encompass the material's behavior during solid and molten-state thermoforming, given the melting and decomposition temperatures acquired from differential scanning calorimetry and thermogravimetric analysis tests, respectively. A new fixture was designed and manufactured to allow pre-heating of the oven and rapid placement of the samples, which in turn, prevents their degradation for the time duration required to reach a uniform temperature distribution in the oven. During the experiments, the 3D digital image correlation technique accurately measured local deformations and strains on the specimen's surface under varying conditions. Further, a finite element model is developed, incorporating a fiber reorientation algorithm with a hypo-elastic shear model to simulate the material's temperature and rate-dependent behavior. The finite element shear angle distributions, as well as the shear angle-force and shear angle-displacement curves, are compared with the Digital Image Correlation (DIC) data and load measurements for different test conditions, showing good agreement between the numerical and experimental approaches.
Original language | English |
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Article number | 111930 |
Pages (from-to) | 1-14 |
Number of pages | 14 |
Journal | Composites Part B: Engineering |
Volume | 289 |
DOIs | |
Publication status | Published - 15 Jan 2025 |
Bibliographical note
Funding Information:The work leading to this publication has been supported by the STOEMP project \"Stamping of thermoplastic composite materials\" and STOEMP 2 project \"Stamping-overmoulding of thermoplastic composites\" coordinated by Syensqo (former Solvay) and funded by Innoviris. The authors gratefully acknowledge the material supplier W8SVR GmbH.
Publisher Copyright:
© 2024 Elsevier Ltd
Keywords
- Natural fiber
- Thermoplastic composite
- Spread-tow woven
- Shear characterization
- Hypo-elastic
- Finite element
- Solid-state
- Molten-state