Abstract
Woven fabric undirectional laminae in the form of plain weave present an important advantage over typical fiber reinforced laminae, which consists that, at the strong weave plane, their failure locus approaches very close to a circle, thus suggesting that the failure mode on this plane is invariant and independent of the orientation of the fiber direction [1]. While this property appears when the loading axis coincides with the principal stress directions in the isotropic plane, it is of interest to study the failure locus in this isotropic plane of weave for off-axis modes of loading. It is the purpose of this paper to study the general case of failure mode in the isotropic strong-plane of a woven fabric composite when the loading direction of the lamina subtends an arbitrary angle with the principal material directions. Interesting results were derived indicating that for an angle of off-axis loading of the order of ϕ=±15° this quasi-isotropy is maintained. However, for larger angles of off-axis loadings varying between ϕ=±15° and ϕ=±(90−15)° the discepancies from isotropy are mild with the highest at ϕ=±45°.
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