Experimental and numerical analysis of the defects induced by the thermoforming process on woven textile thermoplastic composites

D’Emilia, Giulio; Gaspari, Antonella; Natale, Emanuela; Stamopoulos, Antonios G.; Ilio, A. Di

doi:10.1016/j.engfailanal.2022.106093

Cited by 5 publications

(1 citation statement)

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“…Limited extensibility in fiber direction will have a pronounced effect on the overall deformation, resulting in dominant shear behavior and local thickening rather than thinning. The fiber directions may be tracked intuitively using drawn lines [6], a tracer in the fabric [7,8] or directly from the materials' inherent pattern [9,10]. However, full field strain measurements, using photogrammetry for example, provide a more complete picture of the local deformations.…”

Section: Introductionmentioning

confidence: 99%

In-plane deformation measurements for validation of composite forming simulations

Brands

2023

Materials Research Proceedings

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Abstract. Validation of composites forming simulations is essential to improve simulation predictions. Detailed validation requires reliable and well-controlled forming processes with precise methods for comparison to simulation results. This study presents some preliminary results from press forming experiments with cross-ply laminates shaped over a dome geometry. The material studied is a unidirectional carbon-fiber reinforced thermoplastic composite. The forming experiments were combined with a deformation measurement technique based on photogrammetry to measure the in-plane deformation on the surface of the laminate after forming. The obtained full-field deformation measurements allow for a direct and quantitative comparison with simulations. The accuracy and precision of the methodology are discussed in detail. The combination of a versatile forming experiment and a detailed analysis method as presented in this article could enable a more precise validation of composite forming simulations.

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