NASA CONTRACTOR REPORT CO CO CM NASA CR-2313 NON-LINEAR BEHAVIOR OF FIBER COMPOSITE LAMINATES by Zvi Hashin, Debal Bagchi, and B. Walter Rosen Prepared by MATERIALS SCIENCES CORPORATION Blue Bell, Pa. 19422 for Langley Research Center NATIONAL AERONAUTICS AND SPACE ADMINISTRATION • WASHINGTON, D. C. • APRIL 1974