Abstract
Dynamic yield strength of metals/alloys depends on loading pressure and rates sensitively. With the development of laser interferometer measurement system, extracting strength information from window/free surface velocity profiles in shock and ramp loading experiments is becoming an important method to investigate materials’ dynamic response under high pressure and high strain rates. Backwards characteristics analysis method (BCAM) can analyze the velocity profiles more reasonable because it accounts for bending of the incoming characteristics due to impedance mismatch between the sample and window. Synthetic analyses of reverse impact experiment and graded-density impactor loading-releasing experiment suggest that BCAM can give more accurate results including sound speed-particle velocity and yield strength at high pressure than incremental impedance matching method. We use BCAM to analyze velocity profiles of Sn in shock-release experiments and obtain its shear modulus and yield strength at different shock pressure and investigate its phase transition and dynamic unloading response.
Highlights
Metals /alloys under extreme loading such as impact, explosion, penetration, etc. have attracted much attention because of interesting phenomena and great challenges to experiment and simulation
A number of experiments have shown that the dynamic yield strength of metals depends on loading pressure and rates very sensitively [1,2,3]
The backwards characteristics analysis method (BCAM) can account for bending of the incoming characteristics due to impedance differences between the sample and window, this method do not need to know the form of equations of state (EOS) and constitutive model
Summary
Metals /alloys under extreme loading such as impact, explosion, penetration, etc. have attracted much attention because of interesting phenomena and great challenges to experiment and simulation. The BCAM can account for bending of the incoming characteristics due to impedance differences between the sample and window, this method do not need to know the form of equations of state (EOS) and constitutive model. This method has been limited to analyzing only the loading portion of a ramp experiment and cannot account for elastic-plastic unloading due to an assumption of a unique one-to-one sound speed for a given pressure or particle velocity in this method. We use the BCAM to analyze velocity profiles of Sn in shockrelease experiments and obtain its shear modulus and yield strength at different shock pressures and investigate its phase transition and dynamic unloading response
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