Determination of residual stresses by local annealing to laser speckle pattern interferometry

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One of the most common methods of experimentally determining residual stresses is Blind Hole Drilling (BHD). A new method which is a thermo-optical analog to BHD is being developed. This method uses local heating to anneal a tiny spot and uses laser speckle interferometry to measure the strain that results. This strain is used to determine the state of stress prior to heating. The peak temperatures are on the order of 200 Celsius so that for most metals, there will be no changes in phase or other material properties except for a slight reduction in yield stress. Preliminary experiments with ... continued below

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4 p.

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Pechersky, M. & Vikram, C.S. May 1, 1997.

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  • Pechersky, M. Westinghouse Savannah River Company, Aiken, SC (United States)
  • Vikram, C.S. Univ. of Alabama, Huntsville, AL (United States)

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Description

One of the most common methods of experimentally determining residual stresses is Blind Hole Drilling (BHD). A new method which is a thermo-optical analog to BHD is being developed. This method uses local heating to anneal a tiny spot and uses laser speckle interferometry to measure the strain that results. This strain is used to determine the state of stress prior to heating. The peak temperatures are on the order of 200 Celsius so that for most metals, there will be no changes in phase or other material properties except for a slight reduction in yield stress. Preliminary experiments with type 304 stainless steel were performed using resistance heating. The experimental results were in excellent agreement with finite element model predictions of the process. Subsequently, the resistance heating was replaced with laser heating. The heat input (22.5 Watt peak) from a small sealed radio frequency excited Carbon Dioxide laser was used. In order to both control the heating temperature and efficiently couple the infrared photons from the laser into the test specimen, a substance known as Liquid Temperature Indicating Paint was used. Without this substance the laser power would be so large as to make this approach impractical. Furthermore the measurement and control for the heat input would be very complicated. Using this laser heating approach was successful in obtaining similar results to those obtained in other work. Since this laser based technique is a thermo-optical analog to blind hole drilling a simple stress model is required to interpret the measured results. This simple stress model is presented. As in BHD, the simple model must be modified by empirical coefficients to be useful. These empirical coefficients are determined by experimentation and/or numerical analysis

Physical Description

4 p.

Notes

OSTI as DE97060079

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  • 1997 SEM Spring conference on experimental and applied mechanics, Bellingham, WA (United States), 2-4 Jul 1997

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  • Other: DE97060079
  • Report No.: SRT-MTS--97-3001
  • Report No.: CONF-970763--1
  • Grant Number: AC09-96SR18500
  • Office of Scientific & Technical Information Report Number: 484532
  • Archival Resource Key: ark:/67531/metadc674680

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • May 1, 1997

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  • July 25, 2015, 2:21 a.m.

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  • Feb. 9, 2016, 4:55 p.m.

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Pechersky, M. & Vikram, C.S. Determination of residual stresses by local annealing to laser speckle pattern interferometry, article, May 1, 1997; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc674680/: accessed June 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.