کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5456190 | 1514655 | 2017 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Photostress analysis of stress-induced martensite phase transformation in superelastic NiTi Photostress analysis of stress-induced martensite phase transformation in superelastic NiTi](/preview/png/5456190.png)
Phase transformation in shape memory alloys is the most important factor in their unique behavior. In this paper, the formation of stress induced martensite phase transformation in a superelastic NiTi (50.8% Ni) shape memory alloy was investigated by using the photo-stress method. First, the material's fabrication procedure has been described and then the material was studied using the metallurgical tests such as differential scanning calorimetry and X-ray diffraction to characterize the material features and the mechanical tensile test to investigate the superelastic behavior. As a new method in observation of the phase transformation, photo-stress pictures showed the formation of stress induced martensite in a superelastic dog-bone specimen during loading and subsequently it's disappearing during unloading. Finally, finite element analysis was implemented using the constitutive equations derived based on the Boyd-Lagoudas phenomenological model.
Journal: Materials Science and Engineering: A - Volume 688, 14 March 2017, Pages 202-209