NASA Technical Memorandum 103643 Relationship Between Voids and Interlaminar Shear Strength of Polymer Matrix Composites Kenneth J. Bowles and Stephen Frimpong Lewis Research Center Cleveland, Ohio Prepared for the 36th International SAMPE Symposium and Exhibition sponsored by the Society for the Advancement of Materials and Process Engineering San Diego, California, April 15-18, 1991 r6 NASA