A Magnetic Method for the Determination of Residual Stress
نویسنده
چکیده
A magnetlc method for the measurement of residual longitudinol stress i n the outer portions of cylindrical bars is developed and applaed to nickel and steel. I t involves measurement of the reversible effective permeobili ty over a range of frequency of the applted alternating field. Special composite specimens, in which ony desired level of residual stress con be produced, serve as idealized test specimens. Magnetic stress meosurements made on cold-drown, mochined and quenched rods ore compored with meosurements by X-roy diffroctlon and mechanical relaxation (slitting). A combination of magnetic and X-ray measurements yields qualitative information about the stress gradient in the outer portion of a bar. A ropid magnetic-test method, suitoble for practical appl~cotion, is described.
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