Title: Warpage Predication of Continuous Fiber Reinforced Thermoset or Thermoplastic Composite Using a Multi-Scale Modeling

Authors: A. Cheruet

DOI: 10.33599/nasampe/c.19.0740

Abstract: Today, thermoset composites are present in all major structures of the recent large aircraft programs especially because their mechanical properties are suitable for highly stressed parts. However, their manufacturing process (RTM, infusion or prepreg) are still challenging due to the complex polymerization that takes place during the curing cycle, yielding to some defects like residual stresses and process induced distortions.

In the case of thermoplastic resin reinforced by CFRP, the prediction of the warpage after the forming cycle like thermoforming is still a challenge especially for double-curved shapes inducing large variation of the angle between the warp and weft directions. This local modification of the composite microstructure will have a strong impact on the local thermo-mechanical properties of the ply which makes difficult to predict accurately the total warpage of the part.

But in both cases, the acceleration of their development must rely on simulation tools that help to understand the process parameters on the final quality of the product.

The article will demonstrate how multi-scale approach can help:

• To compute ply properties based on a limited set of experimental data obtained at the constituent level and on the accurate description of the local fiber organization

• To simulate the complete cure cycle, to predict residual distortions and to support the mold design iteration

References: 1. [1] P. Hubert, A. Johnston, A. Poursartip, K. Nelson, Cure kinetics and viscosity models for Hexcel 8552 epoxy resin, International SAMPE Symposium and Exhibition (2001), 46 (2001: A Materials and Processing Odyssey, Book 2), 2341-2354 2. [2] Di Benedetto A, Prediction of the glass transition temperature of polymers: a model based on the principle of corresponding states. Journal of Polymer Sciences Part B: Polymer physics. 1987, 25(9). 3. [3] Bogetti TA., Gillepsie JW, Composites Laminates, 1992, 26(5): 626-660. 4. [4] Van Der Ween S., Matzke F., Using multi-scale workflow to simulate Epoxy composite curing. Digimat user’s meeting 2017 (Berlin).

Conference: CAMX 2019

Publication Date: 2019/09/23

SKU: TP19-0740

Pages: 11

Price: $22.00