Influence of ply thickness in the [0/90n]s CFRP laminate under quasistatic in-plane compression loading: Experimental and finite element modeling study Y. Kumar1,∗, M. Rezasefat1, P. I. Dolez2, J. D. Hogan1 1 Department of Mechanical Engineering, University of Alberta, Edmonton, Canada 2 Department of Human Ecology, University of Alberta, Edmonton, Canada ∗ yogesh.kumar@ualberta.ca Keywords: Carbon fiber reinforced polymer, Quasi-static compression, Laminate thickness, Intralaminar and interlaminar damage, Finite element modeling. This work studies the correlation between the 90◦ ply thickness in a [0/90n]s carbonfiber reinforced polymer (CFRP) lay-up and its in-plane compressive strength. In literature, studies have shown that lamina thickness have a significant effect on the mechanical response and damage inheritance in the structure [1], [2]. In this study, a quasi-static in-plane compression experiments coupled with digital image correlation (DIC) were performed on laminated composite [MTC510-UD300HS-33%] with three different thickness of 2.2, 3.2, and 4.2 mm. The thickness increases with increase in the nth ply of 90◦ while keeping 0◦ ply constant in all the laminates. Then, an LS-Dyna based finite element model (FEM) was developed using a progressive damage model (MAT 55) to investigate the intralaminar and interlaminar damage propagation in the composite. The calibrated FEM model showed good agreement with the experimental results, in terms of qualitative and quantitative damage assessment. The results demonstrate that reducing the 90◦ lamina thickness can influences the mechanism of damage propagation and inhibits matrix cracking. Overall, this study provides insights towards designing and optimization of composite laminate for impact resistance in structural application. References [1] Q. Sun et al., "In-situ effect in cross-ply laminates under various loading conditions analyzed with hybrid macro/micro-scale computational models," Compos Struct, vol. 261, Apr. 2021. [2] A. Arteiro, G. Catalanotti, A. R. Melro, P. Linde, and P. P. Camanho, "Micro-mechanical analysis of the effect of ply thickness on the transverse compressive strength of polymer composites," Compos Part A Appl Sci Manuf, vol. 79, pp. 127-137, Dec. 2015. 133
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