| 摘要 |
PURPOSE:To simplify a measurement procedure and to taken a measurement even when a stress know boundary is not know by finding the maximum and minimum values of reversible magnetic permeability obtained by rotating a measurement direction and the directions in which those values are obtained. CONSTITUTION:Initial parameters K, nu, and mu0 are measured by using a standard test-piece. Then the measurement direction is rotated by a part to be measured and the direction wherein the reversible magnetic permeability becomes maximum or minimum is searched for to find a main force direction. Then reversible magnetic permeability values mu1 and mu2 in the main force direction are measured. Then the value of main stress is calculated from an equation (where sigma1 and sigma2 are the values of the main stress, mu0 reversible magnetic permeability at the time of no stress, K magnetic strain sensitivity, and nu a magnetic Poisson ratio). Consequently, the measurement procedure of the magnetic stress is simplified and even when the stress known boundary is unknown, a measurement is taken.
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