Comparative Analysis on Classical Laminated Plate Theory and Higher Order Lamination Plate Theory for Cross-Ply FRP Composite Structures

摘要

Composite structures play a vital role now-a-days in various applications as the alternative for various parts. While a composite structure is subjected to loading conditions, at yield point it will get broken. But, the upper and lower layers will start to fail before the attainmentof yield point itself because of the laminated structure of composites. Therefore, it is essential to concentrate on the prediction of stress acting at the free edges of composite structures while being loaded. Traditionally, Classical Laminated Plate Theory (CLPT) is being used to predictthe stress induced in composites. But for the purpose of avoiding the complication in the analytical formulations, the effects of some minor modes have been ignored with some assumptions in the formulation of CLPT. Because of this reason, we cannot obtain the exact result using CLPT. So asto get the accurate stress value acting in between the layers and at the free edge of the composite structure, a newly developed Higher Order Lamination Plate Theory (HLPT) has been used. In HLPT formulation, a significant minor mode known to be warping deformation mode has been additionallyconsidered. But, as CLPT is being traditionally used in the stress analysis of composite structures, an attempt is made in this work to know and show the improved accuracy of HLPT over CLPT by considering cross ply E-Glass Fiber Reinforced Composite structure (FRP). Experimental results havebeen considered as the standard values for this analysis.