Effect of elastic anisotropy on strain relief and residual stress determination in cubic systems by FIB-DIC experiments. (15th December 2016)

• Record Type: Journal Article
• Authors: Krottenthaler, M.; Benker, L.; Mughal, M.Z.; Sebastiani, M.; Durst, K.; Göken, M.
• Is Part Of: Materials & design. Volume 112(2016)
• Page Start: 505
• Page End: 511
• Publication Date: 2016-12-15
• Subjects: Focused ion beam milling assisted digital image correlation -- Residual stress -- Elastic anisotropy -- Finite element modelling -- Four point bending; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.09.046
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: Focused Ion Beam milling and Digital Image Correlation analysis (FIB-DIC) method has been shown to offer an effective measure of residual stresses in coatings and bulk materials. In the present work the effect of elastic anisotropy on the residual stress interpretation from FIB-DIC measurements is studied for single crystals with cubic symmetry. Crystal orientation-dependent, elastically anisotropic 3D finite element models of the double slot milling geometry were developed and verified against FIB-DIC measurements performed on in situ four point bent samples of nanocrystalline nickel and single crystal CMSX-6 alloy. A discussion is presented of the limitations of the simplified assumptions vs full anisotropic modelling. Graphical abstract: Highlights: Elastic anisotropy effects on residual stress determination in cubic crystals using the H-bar (double slot) geometry was assessed by FEM. Model was validated using four point bending of single crystal CMSX-6 and polycrystalline nickel alloy. Simplified stress calculation can be used for samples with low Zener anisotropy factor (A < 3). IOther FIB milling geometries (ring-core or four-slot) should be used for samples with high anisotropy factor (A > 3).