Analytical Treatment for Centroid Location Determination in Thin-Walled Multidirectional Composite Shells
Continuous-fiber multidirectional composite materials have played an increasingly significant role in numerous mechanical and aerospace structural applications, and continue to represent the preferred material option due to superior mechanical properties such as specific stiffness-to-weight ratio, low-density characteristics, coupled with significant improvements in fatigue resistance as opposed to metal structure counterparts. Extensive research has demonstrated their core potential as more than just mere lightweight substitutes to conventional materials. Present work shows the development of a novel mathematical framework to analytically identify the location of the centroid for thin-walled, open cross-section, curved composite shells characterized by circumferential arc angle, thickness-to-mean radius ratio, and total laminate thickness, respectively. Current work is also focused on formulating a modified composite shell theory prognosis methodology for investigating the structural response of thin-walled circular cylindrical shell type composite configurations under in-plane mechanical loads respectively. The prime motivation to develop this theory arises from its capability to generate simple yet accurate closed-form analytical results that can efficiently characterize circular composite shell constructions Ply stress variations for curved cylindrical shells are analytically examined under the application of centroidal tensile and bending loading respectively. In-plane ply-stress estimations determined by the present model show excellent agreement in comparison with FEM results.
Author: Sthanu Mahadev
Conference: SAMPE Seattle 2017