Abstract
Auxetic textiles are structural materials that exhibit a negative Poisson’s ratio in which expands transversely under tensile loading. These structural materials have gained increasing importance over the three past decades. This is mostly because of their enhanced mechanical properties compared to non-auxetic ones. In this work, the longitudinal modulus of helical auxetic yarn (HAY) reinforced unidirectional composite has been predicted using lamina theories through elasticity and rule of the mixture approach. In order to verify the model, despite numerical analysis, a comparison of results with available literature experimental data has been made. The results of the comparison showed an excellent agreement in both cases. The proposed model is able to recognize the effect of wrapping angle on the longitudinal modulus of HAY reinforced unidirectional composite.
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