Measured Strain/Calculated Stress

The use of strain gages to measure the strain and calculate the induced stress has long been recognized as a way to predict the long-term performance of a product under stress.

The commonly used Von Mises failure criterion can easily be calculated using either a 2-element 90° tee rosette (assuming max/min strain directions are known) or a 3-element rectangular rosette, in conjunction with StrainSmart data systems from Micro-Measurements.

StrainSmart allows complete confidence in the measured strains and the calculated stress via shunt calibration (scaling to take leadwire desensitization into account) and well-documented formulae (Mohr’s circle and Hooke’s law).

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Tom Rummage

Applications Engineering Manager