Phase-shifted reflective coherent gradient sensor for measuring Young's modulus and Poisson's ratio of polished alloys. (February 2017)

• Record Type: Journal Article
• Authors: Ma, Kang; Xie, Huimin; Fan, Bozhao
• Is Part Of: Optics & laser technology. Volume 88(2017)
• Page Start: 226
• Page End: 233
• Publication Date: 2017-02
• Subjects: Coherent gradient sensing -- Phase shifting -- Reflective surface -- Young's modulus; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2016.09.023
• Languages: English
• ISSNs: 0030-3992

Abstract

Abstract: In this study, the Young's modulus and Poisson's ratio of Ni-Cr Alloy are measured using phase-shifted reflective coherent gradient sensing (CGS) method. Three-point bending experiment is applied to obtain the Young's modulus by measuring the specimen out-of-plane displacement slopes. Bending experiment of a circular plate with fixed edges loaded by a centric concentrated force is applied to obtain the specimen bending stiffness. The Poisson's ratio is then solved by substituting the bending stiffness into Young's modulus. The results show that the phase-shifted reflective CGS method is valid for measuring Young's modulus and Poisson's ratio of metals and alloys. In addition, the reflective specimen surfaces are obtained with precision finishing operations and the polishing parameters are optimized for CGS measurement. This method is more effective than the reflecting film transfer method, which is widely used in previous studies. Highlights: Two bending experiments are implemented to obtain the Ni-Cr alloy specimen slopes. Phase-shifted CGS method is applied for measuring Young's modulus and Poisson's ratio. A novel method to obtain the optical flat reflective CGS specimen is proposed.