Methods and apparatus for measuring stress and strain characteri

Details Methods and apparatus for measuring stress and strain characteri Methods and apparatus for measuring stress and strain characteri

1997-01-15

1998-03-03

Chilcot, Richard

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

73791, G01D 116, G01D 702

Patent

active

057237930

ABSTRACT:
Methods and apparatus are disclosed for measuring stress and strain of microscopic specimens under a microscope. The measurements of strain can be performed simultaneously with measurement of the stress, thereby avoiding problems with creep. The apparatus and methods employ an electrically driven microgripper having at least one finger adapted to contact the specimen. The apparatus and methods also employ a device operable to measure the dimensional change (strain) experienced by the specimen upon application of a stress to the specimen using the finger(s) of the microgripper. From measurements of electrical energy supplied to the microgripper before and during application of the stress to the specimen, and of the stress-caused dimensional change of the specimen, stress-versus-strain information about the specimen can be calculated.

REFERENCES:
patent: 4959552 (1990-09-01), Saffert et al.
patent: 5495771 (1996-03-01), Sumi et al.

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