AD-A230 999 MTL TR 90-54 1`1' L AD FORMATION OF CONTROLLED ADIABATIC SHEAR BANDS IN AISI 4340 HIGH STRENGTH STEEL JOHN H. BEATIY U.S. ARMY MATERIALS TELHNOLOGY LABORAIORY METALS RESEARCH BRANCH LOTHAR W. MEYER FRAUNHOFER-INSTUT FUR ANGEWANDTE MATERIALFORSCHUNG (IFAM) D-287, BREMEN 17, WEST GERMANY MARC A. MEYERS and SIA NEMAT-NASSER UNIVERSITY OF CALIFORNIA. SAN DIEGO la JOU.A. CA 92093 November 1990 DTIC I ELECTE Approved for public release; di~tribution un~imired. S US AfM u T¥ MAN U.S. ARMY MATERIALS TECHNOLOGY LABORATORY i Wawtown. Massadunetts 02172-0001 91 1 Ii• !6