Martensitic Magnetomechanical Measurements
Bias Stress Experiments
The bias load tests were designed to try and generate the maximum possible amount of strain
in the specimens. In these tests, the specimen was first biased with a large axial load (~ 8 MPa)
to favor a single axial variant state. Then this bias load was removed, and a transverse
field applied. With no applied load, the specimen was able to transform more completely, and
generate larger strains. The graph below shows the results of bias tests for the 3 specimens.
The results show that strains on the order of 2-3.5% were generated with CS1-1 and CS2-1.
The strain present after removal of the bias load is found to be a function of specimen
aspect ratio. As aspect ratio increased, the specimen favored a larger volume fraction
of axial variant upon removal of the load. This phenomenon, due to demagnetization effects,
was found to occur repeatably throughout the bias load tests.
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