A shear-compression specimen for large strain testing |
| |
Authors: | D Rittel S Lee G Ravichandran |
| |
Institution: | (1) Graduate Aeronautical Laboratories, California Institute of Technology, 91125 Pasadena, CA, USA;(2) Technion, Israel Institute of Technology, Faculty of Mechanical Engineering, 32000 Haifa, Israel |
| |
Abstract: | A new specimen geometry, the shear-compression specimen (SCS), has been developed for large strain testing of materials. The
specimen consists of a cylinder in which two diametrically opposed slots are machined at 45° with respect to the longitudinal
axis, thus forming the test gage section. The specimen was analyzed numerically for two representative material models, and
various gage geometries. This study shows that the stress (strain) state in the gage, is three-dimensional rather than simple
shear as would be commonly assumed. Yet, the dominant deformation mode in the gage section is shear, and the stresses and
strains are rather uniform. Simple relations were developed and assessed to relate the equivalent true stress and equivalent
true plastic strain to the applied loads and displacements. The specimen was further validated through experiments carried
out on OFHC copper, by comparing results obtained with the SCS to those obtained with compression cylinders. The SCS allows
to investigate a large range of strain rates, from the quasi-static regime, through intermediate strain rates (1–100 s−1), up to very high strain rates (2×104s−1 in the present case). |
| |
Keywords: | Shear large strain testing shear-compression specimen |
本文献已被 SpringerLink 等数据库收录! |
|