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Quantitative knowledge of the mechanical and structural characteristics of human tissue and its analytical interpretation are of considerable clinical significance. The paper presents typical results in relation to two tissues of the body: skin and rib cartilage. As regards the former, the tension necessary to produce blanching is discussed on the basis of measurements taken during operations, while in respect of the latter self-locked stresses evaluated in the laboratory on post-mortem material are presented.

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The paper considers the usefulness of ultrasonic measurement for monitoring the properties of commercially processed material. It can be applied nondestructively for quality control; or by taking sections, full measurement of anisotropy can be made. The methods are exemplified by results for moulded and solid-state-formed polypropylene; and a full 5 MHz elastic measurement has been performed in one case. The relationship of the 5 MHz moduli to those obtained by more usual techniques is also considered; and the possibility of correlation with tensile and impact results. It is felt that the technique will have growing commercial importance.

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