Paper number 356


Pramod Chaphalkar and Ajit D. Kelkar

Center for Composite Materials Research, Department of Mechanical Engineering
North Carolina A & T State University, Greensboro, NC 27411, USA

Summary Woven fabric laminated composites are likely to play a key role in modern lightweight aerospace structures. Before these woven fabric laminated composites can be used in primary structural applications, predictions of elastic properties such as the modulii, Poisson's ratios from the weave architecture and the properties of the constituent materials are desirable. Many models for plain weave, 5- and 8-harness satin weave are available to predict these properties. However, simple analytical model for twill weave pattern is not available. The present paper addresses a basic development of an analytical model to predict the stiffness of the twill composites. Analytical model for twill weave pattern presented in this paper is based on Classical Lamination Theory (CLT). A very simple yet quite general model is developed to obtain the constitutive relationship. The model takes into account effects of the actual fabric structure by considering tow undulations and continuity along both the fill and warp directions. Various tow cross sections are possible and can be easily incorporated for a particular application. The model results in simple formulae to predict in-plane elastic constant, which can be used further in structural analysis.
Keywords twill, woven, textile, laminate theory, elastic properties.

Theme : Textiles

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