F. Pierron et A. Vautrin, MEASUREMENT OF THE INPLANE SHEAR STRENGTHS OF UNIDIRECTIONAL COMPOSITES WITH THE IOSIPESCU TEST, Composites science and technology, 57(12), 1997, pp. 1653-1660
This paper addresses the issue of the measurement of the in-plane shea
r strengths of unidirectional carbon/epoxy composites from Iosipescu s
pecimens. A description of the failure of the samples is presented tog
ether with finite-element calculations that confirm the observations.
This leads to a discussion of the influence of the boundary conditions
on failure, supported by both experimental and finite-element analyse
s. Eventually, it is shown that failure under a homogeneous stress sta
re is achieved, although the presence of parasitic transverse compress
ive stress complicates the interpretation in terms of in-plane shear s
trength. It is shown that the use of a quadratic failure criterion lea
ds to the determination of the in-plane shear strength. (C) 1998 Elsev
ier Science Ltd. All rights reserved.