Dynamic constitutive relation of EMC over a broad range of temperatures and strain rates
In this paper, dynamic properties of EMC were studied sat different temperatures and different strain rates. Firstly EMC was investigated by quasi-static tests. Secondly a series of dynamic compressive experiments of EMC were conducted using the Split Hopkinson Pressure Bar (SHPB) at high strain rates. Corresponding measurements were conducted at temperatures ranging from 20°C to 200°C. The results indicate that the yield strength and flow stress of EMC increase remarkably with the increase of strain rate. However, the yield strength of EMC is almost unchanged with the increase of temperature which is ranging from 20°C to 200°C.
SURVEY OF METHODS OF ANALYSIS FOR PLASTIC DEFORMATION OF STRUCTURES UNDER DYNAMIC LOADING
Abstract : The survey provides a critical study of methods for the analysis of metal structures under dynamic loads leading to large plastic deformation. Relevant material behavior and analytical and numerical methods are summarized. Emphasis is put on critical study of experiments, particularly on beams, with consideration of strain rate sensitive plastic behavior.
Single, Temperature‐Dependent Stress‐Strain Law for the Dynamic Plastic Deformation of Annealed Face‐Centered Cubic Metals
Large amplitude wave propagation in annealed aluminum is studied experimentally to within 70°C of the melting point of the metal. The strain‐rate‐independent, finite amplitude wave theory is found to apply at all temperatures. The governing stress‐strain law in each instance is parabolic. The coefficient of the parabolic stress‐strain law varies linearly with the absolute temperature.The annealed, face‐centered cubic metals of aluminum, copper, lead, gold, and silver are all found to have the same parabolic stress‐strain law at absolute zero.Thus, from experiments using the author's diffraction grating technique, a single stress‐strain law is found which is applicable at any temperature to any of these annealed metals whose melting point is specified.