N/\SA National Aeronautics and Space Adm ►rrstration ANALYSIS OF INTERFACE CRACKS IN ADHEMELY BONDED LAP SHEAR JOINTS E Final Report - Part IV by S.S. Wang snd J.F. Yau ent o! Theoretical and Applied Mechanics ^ , l7NIVERSITY OF ILLINOIS at Urbana-Champaign prepared for NATIONAL AERONAUTICS AND SPACE ADMINISTRATION NASA Lewis Research Center Grant NSG 3044 ( NA SA — Ch- 1654380 ANALY51, NT FR4src