Comparison of Dynamic Methods for Determining Elastic Property Measurements of Solid Materials
[Technical Report, Technical Report]
DEVCOM Army Research Laboratory
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Nondestructive evaluation techniques such as ultrasound point analysis UPA, resonant ultrasound spectroscopy RUS, and impulse excitation IE have been commonly used for determination of elastic properties for various materials and components. These dynamic methods, which are categorized into pulse techniques for measuring transit time of an ultrasonic pulse UPA, and resonance techniques that set samples into mechanical vibration RUS and IE, have been extensively applied for evaluation of armor materials, including ceramics. Dynamic testing methods such as these are highly suited for brittle materials that cannot support large deformation strains before failure, making them particularly attractive for the characterization of hard ceramics. All three of these methods are currently available in the US Army Combat Capabilities Development Command DEVCOM Army Research Laboratorys ARLs Ceramic and Transparent Materials Branch within the Materials and Manufacturing Science Division for determining the elastic properties and speed of sound in materials. The purpose of this report is to provide a brief overview of these techniques, a summary of specimen requirements, and a comparison of pros and cons to determine which technique should be selected for a given application.