Measurement of two-dimensional residual stress in nanocrystalline superelastic NiTi fabricated with pre-strain laser shock peening. (August 2022)

• Record Type: Journal Article
• Authors: Yan, Kai; Wei, Pengbo; Chu, Kangjie; He, Weifeng; Yu, Chao; Ren, Fuzeng; Sun, Qingping
• Other Names: Chen Weiqiu guest-editor.; Fu Yibin guest-editor.; Zhong Zheng guest-editor.
• Is Part Of: Mathematics and mechanics of solids. Volume 27:Number 8(2022)
• Page Start: 1559
• Page End: 1568
• Publication Date: 2022-08
• Subjects: NiTi shape memory alloy -- residual stress -- digital image correlation -- focused ion beam -- laser shock peening; Materials -- Mechanical properties -- Periodicals; Solids -- Periodicals; Materials science -- Mathematics -- Periodicals; 620.11205
• DOI: 10.1177/10812865221090589
• Languages: English
• ISSNs: 1081-2865

Abstract

The measurement of residual stress is a challenging issue in industrial fields. In this work, focused ion beam (FIB) and digital image correlation (DIC) are combined together to measure the two-dimensional residual stress in nanocrystalline NiTi plates processed with pre-strain laser shock peening (LSP). A four-point bending experiment verifies the accuracy of this measurement method. The pre-strain LSP-treated surfaces are found to have significant compressive residual stress along the pre-strain direction and tensile residual stress along the vertical to pre-strain direction, which verifies pre-strain LSP as an efficient approach to create gradient residual stress layers in nanocrystalline NiTi plates. The FIB-DIC method has also proven to be an attractive tool to measure the two-dimensional residual stress in phase transition nanocrystalline materials.