Material Behavior Under High Stress and Ultrahigh Loading Rates

The Army Materials and Mechanics Research Center in coopera­ tion with the Materials Science Group of the Department of Chemical Engineering and Materials Science of Syracuse University has been conducting the Annual Sagamore Army Materials Research Conference since 1954. The specific purpose of these conferences has been to bring together scientists and engineers from academic institutions, industry, and government who are uniquely qualified to explore in depth a subject of importance to the Department of Defense, the Army, and the scientific community. The proceedings of this conference, entitled MATERIAL BEHAVIOR UNDER HIGH STRESS AND ULTRAHIGH LOADING RATES, will be published in two parts. The topics covered in the present volume include dynamic plasticity, adiabatic shear/localized deformation, and dynamic fracture mechanics. Papers dealing with ordnance applica­ tions, projectile launch environment, and recent work-in-progress will appear as an AMMRC Technical Report and will have more limited distribution in accordance with recent Army guidelines. The Conference Chairmen are particularly grateful to the members of the Program Committee. We wish also to acknowledge the assistance of Mr. Charles Polley of the Army Materials and Mechanics Research Center, Mr. Robert Sell, Ms. Helen Brown DeMascio, and Ms. Mary Ann Holmquist of Syracuse University throughout the con­ ference planning stages and the publication of the text. The continued active interest in and support of these confer­ ences by Dr. E. Wright and Col. George Sibert, Direct and Deputy Director/Commander, respectively, of the Army Materials and Mechan­ ics Research Center, is appreciated.

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Section I: Dynamic Plasticity.- Dynamic Plastic Response of Metals Under Pressure-Shear Impact.- Strain-Rate History Effects and Dislocation Substructure at High Strain Rates.- Materials Response to Large Plastic Deformation.- Strain-Rate Effects in Metals at Large Shear Strains.- Microstructure and Mechanical Properties of Precipitation Hardened Aluminum Under High Rate Deformation.- Section II: Adiabatic Shear/Localized Deformation.- Adiabatic Shearing - General Nature and Material Aspects.- The Occurrence of Shear Bands in Metalworking.- The Behavior of Metals Under Ballistic Impact at Sub-Ordnance Velocities.- Section III: Dynamic Fracture Mechanics.- Dynamic Fracture Mechanics and its Applications to Material Behavior Under High Stress and Loading Rates.- Energy Release Rates and Path Independent Integrals in Dynamic Fracture.- High Rate Deformation in the Field of a Crack.- Dynamic Crack Curving and Crack Branching.- Crack Propagation and Arrest Under Dynamic Loading Conditions in an Elastic-Plastic Strip.- Optical Determination of the Intensity of Crack Tip Deformation in a Power-Law Hardening Material.- Application of Microstatistical Fracture Mechanics to Dynamic Fracture Problems.- Scaling of Shear Band Fracture Processes.- Application of Gurson Void Growth Model to Dynamic Fracture.- (VOL. II).- Work In Progress.