Title: Uniaxial Tensile Properties of AS4 3D Woven Composites with Four Different Resin Systems: Experimental Results and Analysis-Property Computations

Authors: Babak Farrokh, Kenneth N. Segal, Trenton M. Ricks, Sandi G. Miller, Benjamin T. Rodini, and David S. Sleight

DOI: 10.33599/nasampe/c.19.0646

Abstract: As a part of the NASA Composite Technology for Exploration project, eight different AS4 3D orthogonal woven composite panels were manufactured and were subjected to mechanical testing including uniaxial tension along the weaves’ warp direction. Each set, with four different resin systems (KCR-IR6070, EP2400, RTM6, and RS-50), included weave architectures designed using 12K and 6K AS4 carbon fiber yarns. For the tension testing conducted at Room Temperature Ambient (RTA) condition, the elastic modulus and strength of these eight panels (as-processed and thermally cycled) were measured and compared while the potential evolution of micro-cracking before and after thermal cycling were monitored via optical microscopy and X-Ray Computed Tomography. The data set also included test results of the as-processed materials at Elevated Temperature Wet (ETW) condition. In the second part of this study, efforts were made to compute elastic constants for AS4 6K/RTM6 and AS4 12K/RTM6 materials by implementing a finite element approach and the Multiscale Generalized Method of Cells (MSGMC) technique developed at NASA Glenn Research Center. Digimat-FE was used to model the weave architectures, assign properties, calculate yarn properties, create the finite element mesh, and compute the elastic properties by applying periodic boundary conditions to finite element models of each repeating unit cell. The required input data for MSGMC was generated using Matlab® from Digimat exported weave information. Experimental and computational results were compared, and the differences and limitations in correlating to the test data were briefly discussed.

References: 1. Tsukrov, I., Bayraktar, H., Giovinazzo, M., Goering, J., Gross, T., Fruscello, M., Martinsson., L. "Finite element modeling to predict cure-induced microcracking in three-dimensional woven composites". International Journal of Fracture 172 (2011): 209-216. 2. Bayraktar, H., Tsukrov, I., Giovinazzo, M., Goering, J., Gross T., Fruscello, M., Martinsson, L. "Predicting cure-induced microcracking in 3d woven composites with realistic simulation technology". Proceeding of International SAMPE Tech. Conf. Baltimore, MD, May 21-24, 2012. 3. TexGen. Available from: http://texgen.sourceforge.net/index.php/Main_Page 4. Digimat, 2018. Available from: http://www.e-xstream.com/products/digimat/about-digimat. 5. Aboudi, J., S.M. Arnold, and B.A. Bednarcyk, Micromechanics of composite materials. Elsevier, Oxford, UK, 2012. 6. Ricks, T.M., B. Farrokh, B.A. Bednarcyk, and E.J. Pineda. "A comparison of different modeling strategies for predicting effective properties of 3D woven composites". AIAA SciTech Forum. 2019. San Diego, CA. 7. Bednarcyk, B.A. and S.M. Arnold, "Micromechanics-based modeling of woven polymer matrix composites". AIAA Journal, Vol. 41, No. 9, 2003, pp. 1788-1796. doi: 10.2514/2.7297.

Conference: CAMX 2019

Publication Date: 2019/09/23

SKU: TP19-0646

Pages: 15

Price: $30.00