Time-of-flight Ultrasonic Determination Of 3D Elastic Constants
The three dimensional elastic constants of materials can be measured using the ultrasonic immersion method. This was pioneered by xx and xx from the National Physical Laboratory in the 19xxs. It has mainly been used for polymer composite materials. Knowledge of the elastic constants can be used to feed back into models of the material's behaviour or that of the composite manufacturing process used.
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—Henry David Thoreau (1817–1862)