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An Extensometer for Soft Material Strain Measurement

Nigel G. Shrive, Erich Damson, Cyril B. Frank, Richard A. Meyer, L Mejig, G Lucas

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Abstract

The criteria for the design of a device for measuring strain in flexible materials, particularly soft tissues, are described. An extensometer is described which meets the design criteria. The resolution of the extensometer depends on its gage length. With a gage length of 5 mm, a resolution of 20–50 microstrain can easily be obtained. Some preliminary results are presented showing the sensitivity of the results obtained to the contact force between the extensometer and the specimen.

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What this paper is about

The criteria for the design of a device for measuring strain in flexible materials, particularly soft tissues, are described. An extensometer is described which meets the design criteria. The resolution of the extensometer depends on its gage length. With a gage length of 5 mm, a resolution of 20–50 microstrain can easily be obtained. Some preliminary results are presented showing the sensitivity of the results obtained to the contact force between the extensometer and the specimen.

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Available abstract

The criteria for the design of a device for measuring strain in flexible materials, particularly soft tissues, are described. An extensometer is described which meets the design criteria. The resolution of the extensometer depends on its gage length. With a gage length of 5 mm, a resolution of 20–50 microstrain can easily be obtained. Some preliminary results are presented showing the sensitivity of the results obtained to the contact force between the extensometer and the specimen.

Key concepts: Extensometer, Strain gauge, Materials science, Strain (injury), Sensitivity (control systems), Resolution (logic), Structural engineering, Composite material

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