www.tjprc.org editor@tjprc.org BUCKLING ANALYSIS OF STIFFENED COMPOSITE PANELS FOR DIFFERENT PLY ORIENTATIONS N. MADHAVI 1 , K. SREELAKSHMI 2 & SUDHAKAR ATCHYUTUNI 3 1 Associate Professor, Department of Aeronautical Engineering, MLR Institute of Technology, Hyderabad, India 2 Assistant Professor, Department of Aeronautical Engineering, MLR Institute of Technology, Hyderabad, India 3 Student, Department of Aeronautical Engineering, MLR Institute of Technology, Hyderabad, India ABSTRACT Buckling and post-buckling analysis was performed on composite stiffened panel using Abaqus/CAE to obtain the critical load and modes of failures, with different parameters like ply orientation, different composite materials, stiffeners & by changing the number of stiffeners were derived. To investigate the buckling behavior of composite curved stiffened panels, the nonlinear FE tools Abaqus/Explicit are employed. Studies were conducted using the analytical tool in order to understand the structural behavior in the post buckling range and to determine the critical parameters. KEYWORDS: Buckling, Ply Sequence & ABAQUS etc Received: Dec 01, 2017; Accepted: Dec 20, 2017; Published: Jan 20, 2018; Paper Id.: IJMPERDFEB201881 INTRODUCTION Over the last thirty years composite materials, plastics and ceramics have been the dominant emerging materials. The volume and number of applications of composite materials have grown steadily, penetrating and conquering new markets relentlessly. Modern composite materials constitute a significant proportion of the engineered materials market ranging from everyday products to sophisticated niche applications. Figure 1: Contents of Composite Materials Classification of Composites Composites can be categorized with the traits of the reinforcement & matrix. There are two types of composites. They are • Fiber-Reinforced Composites • Dispersion Hardened Material • Particulate composite • Fibrous Reinforcing Materials Original Article International Journal of Mechanical and Production Engineering Research and Development (IJMPERD) ISSN (P): 2249-6890; ISSN (E): 2249-8001 Vol. 8, Issue 1, Feb 2018, 745-752 © TJPRC Pvt. Ltd.