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The slitting method is a mechanical relaxation technique capable of measuring a single in-plane normal component of residual stress through the thickness of a material. The method originally developed by Finnie and co-workers [1][2][3][4][5], has been reviewed in detail by Prime [6], and is the subject of a recent monograph by Cheng and Finnie [7]. The method has been called by various names in earlier work, including "crack compliance method," or simply the "compliance method," but ASTM Task Group E28.13.02 suggested using "slitting method" going forward to highlight a useful parallel between slitting and the "hole drilling method." Slitting has great utility for practical laboratory residual stress measurements because it is relatively simple to perform, can be done quickly, and offers excellent repeatability [8]. This chapter is intended to complement the extensive technical background existing presently in the literature, much of it summarized in [6] and [7], with a practical treatment useful to those interested in making measurements. Another source for useful practical information on slitting is the internet resource maintained by Prime [9].In slitting, a planar slit is introduced by incrementally cutting into a material containing residual stresses in steps of increasing depth. Deformation near the slit, arising from release of residual stress on the (newly traction-free) slit faces, is measured as a function of increasing slit depth and used to determine residual stress existing normal to the slit plane prior to slitting. Much of this chapter considers a common implementation of slitting, where through thickness residual stress in a metallic flat block is determined from strain measured at the back face of the block by a strain gage, see Figure 4.1. However, the method has sufficient flexibility to enable measurements of residual stresses in a variety Practical Residual Stress Measurement Methods, First Edition. Edited by Gary S. Schajer.
The slitting method is a mechanical relaxation technique capable of measuring a single in-plane normal component of residual stress through the thickness of a material. The method originally developed by Finnie and co-workers [1][2][3][4][5], has been reviewed in detail by Prime [6], and is the subject of a recent monograph by Cheng and Finnie [7]. The method has been called by various names in earlier work, including "crack compliance method," or simply the "compliance method," but ASTM Task Group E28.13.02 suggested using "slitting method" going forward to highlight a useful parallel between slitting and the "hole drilling method." Slitting has great utility for practical laboratory residual stress measurements because it is relatively simple to perform, can be done quickly, and offers excellent repeatability [8]. This chapter is intended to complement the extensive technical background existing presently in the literature, much of it summarized in [6] and [7], with a practical treatment useful to those interested in making measurements. Another source for useful practical information on slitting is the internet resource maintained by Prime [9].In slitting, a planar slit is introduced by incrementally cutting into a material containing residual stresses in steps of increasing depth. Deformation near the slit, arising from release of residual stress on the (newly traction-free) slit faces, is measured as a function of increasing slit depth and used to determine residual stress existing normal to the slit plane prior to slitting. Much of this chapter considers a common implementation of slitting, where through thickness residual stress in a metallic flat block is determined from strain measured at the back face of the block by a strain gage, see Figure 4.1. However, the method has sufficient flexibility to enable measurements of residual stresses in a variety Practical Residual Stress Measurement Methods, First Edition. Edited by Gary S. Schajer.
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