Mechanical Behavior of Materials Under Dynamic Loads : Symposium Held in San Antonio, Texas, September 6-8, 1967

An adequate physical and mathematical description of material be­ havior is basic to all engineering applications. Fortunately, many prob­ lems may be treated entirely within the framework of elastic material response. While even these problems may become yuite complex be­ cause of geometrical and loading conditions, the linearity, reversibility, and rate independence generally applicable to elastic material descrip­ tion certainly eases the task of the analyst. Today, however, we are in­ creasingly confronted with practical problems which involve material response which is inelastic, hysteretic and rate dependent combined with loading which is transient in nature. These problems include, for instance, structural response to moving or impulsive loads, all the areas of ballistics (internal, external and terminal), contact stresses under high speed bearings, high speed machining, rolling and other metal working processes, explosive and impact forming, shock attenuation structures, seismic wave propagation, and many others of equal im­ portance. As these problems were encountered, it became increasingly evident that we did not have at hand the physical or mathematical description of the behavior of materials necessary to produce realistic solutions. Thus, during the last ten years particularly, there has been considerable effort expended toward the generation of both experi­ mental data on the dynamic mechanical response of materials as well as the formulation of realistic constitutive theories. It was the purpose of the Symposium at which the articles in this book were presented to discuss and review recent developments in this field. Front Matter....Pages i-xviii Dynamical Strength of an Ideal Solid with Definite Constitutive Equation....Pages 1-9 An Experimental Study of Instability Phenomena in the Initiation of Plastic Waves in Long Rods....Pages 10-20 Plastic Deformation Waves and Heat Generated Near the Yield Point of Annealed Aluminum....Pages 21-60 On Thermodynamic Foundations of Viscoplasticity....Pages 61-76 Some Experiments in Dynamic Plasticity under Combined Stress....Pages 77-95 The Speed of Ductile-Crack Propagation and the Dynamics of Flow in Metals....Pages 96-133 Dynamic Mechanical Behavior of Metal at the Tip of a Plane Strain Crack....Pages 134-151 Dynamical Behavior of Dislocations....Pages 152-175 Constitutive Equations for Dynamic Material Behavior....Pages 176-190 Effect of Strain Rate on the Dislocation Substructure in Deformed Niobium Single Crystals....Pages 191-240 Constitutive Relationships from Impact Studies....Pages 241-253 Prediction of Elastic-Plastic Wave Profiles in Aluminum 1060-0 Under Uniaxial Strain Loading....Pages 254-269 The Plate Impact Configuration for Determining Mechanical Properties of Materials at High Strain Rates....Pages 270-293 The Relationship Between the Constitutive Equation and One-Dimensional Wave Propagation....Pages 294-313 Plane-Strain Plastic Wave Propagation in a Dynamically Loaded Hollow Cylinder....Pages 314-328 Dynamic Plasticity Under Combined Stress....Pages 329-342 Unified Theory of Thermomechanical Behavior of Viscoelastic Materials....Pages 343-364 Static and Dynamic Material Behavior of Syntactic Foam....Pages 365-387 The Effect of Pressure, Temperature, and Loading Rate on the Mechanical Properties of Rocks....Pages 388-401 Back Matter....Pages 403-419