Application of Miniature Ring-Core and Interferometric Strain/Slope Rosette to Determine Residual Stress Distribution With Depth—Part II: Experiments

[+] Author and Article Information
Wei Ren

Department of Mechanical Engineering, Oakland University, Rochester, MI 48309weiren74@hotmail.com

Keyu Li

Department of Mechanical Engineering, Oakland University, Rochester, MI 48309kli@oakland.edu

J. Appl. Mech 74(2), 307-314 (Feb 05, 2006) (8 pages) doi:10.1115/1.2198252 History: Received May 06, 2004; Revised February 05, 2006

The theoretical development of the interferometric strain/slope rosette (ISSR) and ring-core cutting method is described in Part I of the paper [K. Li and W. Ren, ASME J. Appl. Mech.74(2), 298–306 (2007)]. In Part II, experiments are presented to demonstrate the applicability of the method. The procedures of experimentation are developed. An ISSR/ring-core cutting system was established and its measurement stability and accuracy were examined in a two-step measurement program. By repeating the two-step measurement procedures, several incremental ring-core cutting experiments were conducted. Residual stress distribution is calculated from the measured ISSR data by using the relaxation coefficients calibrated in Part I of the paper. Measurement resolution, accuracy, and sensitivity of the ISSR/ring-core method are evaluated. Tests on a titanium block show the reliability of the method in comparison with the results obtained by using other measurement methods. The new method is also applied on a laser weld which demonstrates its uniqueness to measure residual stresses in small areas with high stress gradients. The experiments show advantages of the ISSR/ring-core method, such as miniature size, noncontacting nature, and high sensitivity. The method can be effectively used to measure residual stress distributions with depth on various manufactured components.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Schematic diagram of ISSR measurement system

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Figure 2

Results of two-step ISSR measurements compared with those obtained by RSG measurements and theoretical calculations

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Figure 3

Ring-core cut on the surface of aluminum bar

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Figure 4

Setup of the ISSR system for incremental ring-core cutting experiments

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Figure 5

Cumulative relieved strains and residual stresses for Test No. 1 on the Ti-alloy block

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Figure 6

Cumulative relieved strains and residual stresses for Test No. 2 on the Ti-alloy block

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Figure 7

Test sample cut from a hydroformed frame

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Figure 8

Sample with a ring-core cut in plan, elevation, and side views

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Figure 9

Cumulative relieved strains and residual stresses for the laser weld of the hydroformed frame




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