This paper investigates the effect of shear stresses on the determination of residual stresses in isotropic and orthotropic materials by the slitting method. A great deal of research effort is focused on the estimation of the residual stress component normal to the slit face using strain data measured by strain gauges installed on the top or the back surface of the stressed specimens. However, the slitting process will also release two in-plane and out-of-plane shear stress components, which may influence the measured strains. For the two specimens of carbon/epoxy and glass/epoxy laminated composites as well as a steel specimen, the distribution of released strains on the top and the back surfaces due to the shear stresses is calculated using finite element method and compared with those due to the residual normal stress. The results show that on the back surface, the shear stresses have a very small effect on the measured strains. However, on the top surface, strains due to the residual shear stresses are significant compared with those due to the residual normal stress and cannot be ignored. A method using two top surface strain gauges in both sides of the slit is presented to separate the effects of normal and shear stresses from each other. Also, strains due to the in-plane and the out-of-plane shear stresses could be isolated from each other. If these separations could be carried out successfully, the residual shear stress can be calculated by the proposed formulation.
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January 2012
Research Papers
Effect of Residual Shear Stresses on Released Strains in Isotopic and Orthotropic Materials Measured by the Slitting Method
Mahmood M. Shokrieh,
Mahmood M. Shokrieh
Composites Research Laboratory, Center of Excellence in Experimental Solid Mechanics and Dynamics, School of Mechanical Engineering,
e-mail: Shokrieh@iust.ac.ir
Iran University of Science and Technology
, Tehran 16846-13114, Iran
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Saeed Akbari R.
Saeed Akbari R.
Composites Research Laboratory, Center of Excellence in Experimental Solid Mechanics and Dynamics, School of Mechanical Engineering,
Iran University of Science and Technology
, Tehran 16846-13114, Iran
Search for other works by this author on:
Mahmood M. Shokrieh
Composites Research Laboratory, Center of Excellence in Experimental Solid Mechanics and Dynamics, School of Mechanical Engineering,
Iran University of Science and Technology
, Tehran 16846-13114, Iran
e-mail: Shokrieh@iust.ac.ir
Saeed Akbari R.
Composites Research Laboratory, Center of Excellence in Experimental Solid Mechanics and Dynamics, School of Mechanical Engineering,
Iran University of Science and Technology
, Tehran 16846-13114, Iran
J. Eng. Mater. Technol. Jan 2012, 134(1): 011006 (9 pages)
Published Online: December 6, 2011
Article history
Received:
May 30, 2011
Revised:
September 15, 2011
Accepted:
September 15, 2011
Online:
December 6, 2011
Published:
December 6, 2011
Citation
Shokrieh, M. M., and R., S. A. (December 6, 2011). "Effect of Residual Shear Stresses on Released Strains in Isotopic and Orthotropic Materials Measured by the Slitting Method." ASME. J. Eng. Mater. Technol. January 2012; 134(1): 011006. https://doi.org/10.1115/1.4005267
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