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Sound Speeds of Solids from Ultrasonic Pulse Receiver Measurements

Borg, Jack D.

A common method of determining elastic material properties is utilizing an ultrasonic pulse receiver. This is a non-destructive test (NDT) causing no plastic deformation of the material. It requires a pulse generator, oscilloscope, and two transducers to measure the sound velocity of a material. Both longitudinal and shear sound velocities may be obtained by utilizing the appropriate transducer. Acoustic nondestructive testing methods are often used in manufacturing certification processes and f

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"Soft" catching high velocity projectiles and targets

Borg, Jack D.

In order to perform post mortem analysis on materials launched in gas guns and powder guns, various methods have been explored to soft catch these materials. The majority of the deformation profile must be from the initial impact during the experiment, not from the subsequent impact with the energy absorption material in the catch tank. This process becomes increasingly more difficult with increased velocities. This report explores a method to soft catch materials launched at velocities 3000 ms

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