Hm. Hsiao et Im. Daniel, EFFECT OF FIBER WAVINESS ON STIFFNESS AND STRENGTH REDUCTION OF UNIDIRECTIONAL COMPOSITES UNDER COMPRESSIVE LOADING, Composites science and technology, 56(5), 1996, pp. 581-593
An investigation has been conducted of the effect of fiber waviness on
stiffness and strength reduction of unidirectional composites under c
ompressive loading Analytical models have been developed for determini
ng the elastic properties and compressive strength as a function of fi
ber waviness for three types of wavy patterns: uniform, graded and loc
alized waviness. Compression tests were conducted to verify the predic
tions. Experimental results were in good agreement with predictions ba
sed on the analytical models. It is shown that in unidirectional compo
sites both major Young's modulus and compressive strength ave degraded
seriously with increasing fiber waviness. Material anisotropy is also
shown to influence the degree of stiffness and strength reduction. In
terlaminar shear failure was found to be the dominant failure mechanis
m for unidirectional wavy composites under compressive loading. (C) 19
96 Published by Elsevier Science Limited