Improved and Experimental Research on the Recovery Stress Model of NiTi Shape Memory Alloys

Abstract:

Abstract:To eliminate the prediction errors of the recovery stress model of NiTi SMAs caused by the incomplete reverse martensitic transformation, an improved prediction model of recovery stress had been developed based on the one-dimensional Constitutive Behavior model proposed by Brinson for shape memory alloys (SMAs). This model regarded the martensitic recovery factor as an internal variable and took the stress and temperature into account as influencing factors to martensitic content of SMAs. The curve of recovery stress of NiTi SMAs with different initial strains versus temperature was measured by experiment. Compared with the experimental results, the computation result showed that the model had a certain accuracy to calculate the recovery stress-temperature curve.