Analysis of Slot Orientation in Shear-Compression Specimen (SCS)

• Published in: Experimental mechanics Vol. 51; no. 3; pp. 263 - 273
• Main Authors: Vural, M., Molinari, A., Bhattacharyya, N.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.03.2011; Springer
• Subjects: Applied sciences; Artificial intelligence; Biomedical Engineering and Bioengineering; Characterization and Evaluation of Materials; Computer science; control theory; systems; Control; Dynamical Systems; Engineering; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Inelasticity (thermoplasticity, viscoplasticity...); Lasers; Measurement and testing methods; Optical Devices; Optics; Pattern recognition. Digital image processing. Computational geometry; Photonics; Physics; Solid Mechanics; Structural and continuum mechanics; Vibration; Plastic analysis; Compression; Shear; Large strain; DIC; Shear test; Resistance strain gauge; Stress analysis; High strain; Notched test piece; Image processing; Displacement(deformation); Digital processing; Digital image; Boundary condition; Experimental study; Stress strain; Compression test; Inelasticity; Edge effect; Plasticity; Slot; Compatibility; Uniformity
• ISSN: 0014-4851; 1741-2765
• DOI: 10.1007/s11340-010-9363-1

This paper presents an analytical treatment as well as experimental measurement of the plastic deformation field in shear-compression specimen (SCS) by using digital image processing (DIC) technique. The results provide a set of useful expressions that relates externally applied displacement and load quantities to the equivalent stress and equivalent plastic strain within the gage section. Based on the analysis, we propose modifying the slot angle of SCS geometry from its original value of 45º to 35.26º in order to enhance the uniformity of stress and strain fields in gage section. It is shown by analysis that this enhancement is essentially because the compatibility and boundary conditions that yield a homogeneous deformation field is naturally satisfied for the particular slot orientation of θ  = 35.26°. This conclusion is also supported by experimental evidence that comparatively shows the edge effects for varying slot angles.