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A strain gage rosette is, by definition, an arrangement of two or more closely

positioned gage grids, separately oriented to measure the normal strains along

different directions in the underlying surface of the test part. Rosettes are designed

to perform a very practical and important function in experimental stress analysis.

It can be shown that for the not-uncommon case of the general biaxial stress state,

with the principal directions unknown, three independent strain measurements (in

different directions) are required to determine the principal strains and stresses.

And even when the principal directions are known in advance, two independent

strain measurements are needed to obtain the principal strains and stresses.

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12y ago

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