PSI - Issue 28

Saiaf Bin Rayhan et al. / Procedia Structural Integrity 28 (2020) 1901–1908 Author name / Structural Integrity Procedia 00 (2019) 000–000

1903

3

appropriate mesh element type and number selection (Younes et al. (2011)) that are computationally expensive and appropriate boundary condition setup (Espadas-Escalante (2017)). However, recently Ansys has introduced Material Designer, which has predefined RVE shapes for different composite materials and automatic boundary condition setup (Rayhan and Rahman (2020)). Similar software codes based on mechanics of structure genome (MSG) have been successfully developed mainly for woven composite materials to ease the constitutive modeling and calculate the stiffness properties with failure envelops as a Graphical User Interface (GUI) in Ansys, Abaqus (Lin et al. (2011)) and MSC. Nastran (Liu et al. (2019)). In summary, the finite element is currently evolving as a nondestructive testing method to investigate the effectiveness and usability of composite materials from micromechanics to large structures, which is widely denoted as multiscale modeling. Some notable multiscale analysis based on voids (Huang and Gong (2018)), residual stress-strain during curing process (Wang et al. (2020)), delamination growth and fracture toughness (Dikshit et al. (2017); Yamanaka et al. (2015)) ,etc. have successfully demonstrated the effectiveness of the procedure for constitute modeling and structural analysis of woven composite materials. In this current research paper, a multiscale analysis is performed adopting the commercial finite element code Ansys to investigate the effect of micromechanical properties; namely, fiber volume fraction, yarn volume fraction, fiber thickness and yarn spacing on the buckling behavior of a pinned-fixed 16-layer quasi-isotropic woven composite plate. 2. Multiscale analysis procedure To conduct the multiscale analysis, firstly, Ansys Material Designer is adopted and two different weave types; namely, plain weave and twill weave, which are already preloaded in the FE code are chosen, Fig. 1. Next, fiber and matrix properties are selected from Ansys Material Library and the literature (Younes et al. (2011), Table 1, to calculate the homogenized elastic properties of woven composite materials along with the proper input of other geometric parameters; namely, fiber volume fraction, yarn volume fraction, fabric thickness, yarn spacing and shear angle. A. B. C. D.

Fig. 1: A: Plain weave example [41]; B: Plane weave RVE ; C: Twill weave example [41]; D: Twill weave RVE

Table 1. Elastic moduli of fibers [40]

E 11 , GPa

E 22 , GPa

υ 12

υ 23

G 12 , GPa

G 23 , GPa

Fiber material

Epoxy Carbon Woven 61.34

6.9

0.04

0.3

3.3

2.7

Table 2. Elastic moduli of matrix [36]

Matrix material

E, GPa

υ

Epoxy

5.35

0.354