College of Engineering V'trginia Polytechnic Institute and State University Blacksburg, Virginia 24061 August 1994 CCMS-94-10 VPI-E-94-07 The Buckling Response of Symmetrically Laminated Composite Plates Having a Trapezoidal Planform Area H.D. Radloff, I11 M.W. Hyer 2 M.P. Nemeth 3 Department of Engineering Science and Mechanics NASA Grant NAG-I-343 Interim Report 98 Prepared for: Structural Mechanics Branch Structures Division National Aeronautics and Space Administration Langley Research Center Hampton, VA 23681-0001 lGraduate Student, Department of Engineering Science and Mechanics 2Professor, Department of Engineering Science and Mechanics 3Senior Research Engineer, Structural Mechanics Branch, Structures Division, NASA Langley Re- search Center