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An Experimental-Numerical Technique for Evaluating the Elastic Constants of Unidirectional Laminates by the Optoacoustic Method: Comparison with Some Theoretical Results

2002; Taylor & Francis; Volume: 9; Issue: 2 Linguagem: Inglês

10.1080/153764902753510525

1537-6532

M. Navarrete, Florencia Serrania, M. Villagrán-Munı́z, José María Bravo, Raúl Guinovart, R. Rodrı́guez,

Composite Structure Analysis and Optimization

Abstract In the present article, the elastic constants for unidirectional transversely isotropic laminated composites are measured using the optoacoustic method. In this method, a laser pulse is used as a standard source of ultrasound. Different three-layer unidirectional laminated specimens with different volume fractions of reinforced graphite 716, Kevlar KS-400, and S-2 glass fibers were prepared. The engineering elastic constants ( E 1 , E 2 , G 12 , x 12 ) were obtained by means of the longitudinal velocity measured in different directions and then fitted in the stress-strain relations for a lamina that is stressed in nonprincipal x - y coordinates. The elastic constants determined with the experimental-numerical technique were compared to different theoretical models reported in the literature, such as Hill's modified model, Hashin and Hashin-Rosen's upper and lower bounds models, and the asymptotic homogenization method. The experimental results obtained in this work show good agreement with those mentioned above.