Title: Computational Investigation of the Stochastic Tensile Behavior of Discontinuous Fiber Composite Structures

Authors: Seunghyun Ko, Troy Nakagawa, Zhisong Chen, Ebonni J. Adams, Matthew R. Soja, Chul Y. Park, William B. Avery, Jinkyu Yang, and Marco Salviato1

DOI: 10.33599/nasampe/s.22.0733

Abstract: In this study, we computationally investigate the tensile elastic modulus and the strength of Discontinuous Fiber Composites (DFCs). We examine two different platelet sizes and various thicknesses of DFC coupons. The computational models consist of two important aspects. First, 3D DFC meso-structures are created using a random platelets meso-structure generation algorithm and a random platelets spatial variation function. These algorithms create unique DFC coupons, precisely capturing the associated statistical variations. We transform the meso-structures into finite element models. The FE models capture the intra- and inter-laminar failure mechanisms using a quasi-brittle failure criterion and cohesive elements. The models are validated against uniaxial tension experiment with a large number of coupons. The FE model not only captures the average trend of the elastic modulus and strength, but also their associated variations. As a result, we provide accurate estimations of the B-basis design values to be used as certification guidelines for DFC structures.

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Conference: SAMPE 2022

Publication Date: 2022/05/23

SKU: TP22-0000000733

Pages: 11

Price: $22.00