Experimental study of stress induced martensite transformation under plane state of stress

摘要

An experimental study of stress induced martansite transformation by electrical strain gauges is present. The studies were performance on polycrystalline Cu-Al-Be Shape Memory Alloys. Beams and a bar in cantilever flexion hold to punctual load were instrumented with electrical strain gauges in several points where the state of stress is: a) simple tension, b) simple shear and b) tension-shear. Employing the trasforational load values in each plot was calculated critical principal stresses. Employing the results obtained, σ_1 - σ_2 plots were constructed and a comparison with the yield Von-Mises criteria, Patoor model and Buchheit model for the critical stress were do.