TITLE

Repeatability of the Contour Method for Residual Stress Measurement

AUTHOR(S)
Hill, M.; Olson, M.
PUB. DATE
September 2014
SOURCE
Experimental Mechanics;Sep2014, Vol. 54 Issue 7, p1269
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This paper describes the results of a residual stress measurement repeatability study using the contour method. The test specimen is an aluminum bar (cut from plate), with cross sectional dimensions of 50.8 mm × 76.2 mm (2 in × 3 in) with a length of 609.6 mm (24 in). There are two bars, one bar with high residual stresses and one bar with low residual stresses. The high residual stress configuration (±150 MPa) is in a quenched and over-aged condition (Al 7050-T74) and the low residual stress configuration (±20 MPa) is stress relieved by stretching (Al 7050-T7451). Five contour measurements were performed on each aluminum bar at the mid-length of successively smaller pieces. Typical contour method procedures are employed with careful clamping of the specimen, wire electric discharge machining (EDM) for the cut, laser surface profiling of the cut faces, surface profile fitting, and linear elastic stress analysis. The measurement results provide repeatability data for the contour method, and the difference in repeatability when measuring high or low magnitude stresses. The results show similar repeatability standard deviation for both samples, being less than 10 MPa over most of the cross section and somewhat larger, around 20 MPa, near the cross section edges. A comparison with published repeatability data for other residual stress measurement techniques (x-ray diffraction, incremental hole drilling, and slitting) shows that the contour method has a level of repeatability that is similar to, or better than, other techniques.
ACCESSION #
97370586

 

Related Articles

  • Improvement of the Contour Method for Measurement of Near-Surface Residual Stresses from Laser Peening. Toparli, M.; Fitzpatrick, M.; Gungor, S. // Experimental Mechanics;Nov2013, Vol. 53 Issue 9, p1705 

    A study was conducted to develop a methodology to obtain near-surface residual stresses for laser-peened aluminium alloy samples using the contour method. After cutting trials to determine the optimal cut parameters, surface contours were obtained and a new data analysis method based on spline...

  • Quantifying Three-Dimensional Residual Stress Distributions Using Spatially-Resolved Diffraction Measurements and Finite Element Based Data Reduction. Park, J.-S.; Lienert, U.; Dawson, P.; Miller, M. // Experimental Mechanics;Nov2013, Vol. 53 Issue 9, p1491 

    Residual stress can play a significant role in the processing and performance of an engineered metallic component. The stress state within a polycrystalline part can vary significantly between its surface and its interior. To measure three-dimensional (3D) residual stress fields, a synchrotron...

  • Analysis of Welding Residual Stress on Cracked Vessels with X-ray Diffraction Method. Jun-ming ZHOU; Yi-liang ZHANG // Advanced Materials Research;2014, Issue 937, p318 

    A large number of cracks are found in the 1500m3 Liquefied Light hydrocarbons vessel during the inspection after two years of running. In totally, six vessels being fully heated treated is made of 15MnNbR. Researchers used X-ray stress analyzer measured the welding residual stress of vessels...

  • The Use of Renka Cline algorithm in X-Ray Diffraction Residual Stress Measurement. Chunguang Li; Zhongchen Dai; Zhonghuang Yun; Dongfeng Li; Xinghua Cao // Advanced Materials Research;2014, Issue 881-883, p1846 

    Using the Renka Cline algorithm provided by OriginPro8.6 to fit the longitudinal residual stress through parts of the measurement value on the A7N01-T5 aluminum alloy butt welded joints compared with the whole measurement value. The result shows that the fitting value approximates the...

  • Welding residual stress measurement of an urban buried gas pipeline by X-ray diffraction method. Ruibin, Gou; Wenjiao, Dan; Fei, Qiu; Min, Yu; Weigang, Zhang // Insight: Non-Destructive Testing & Condition Monitoring;Oct2015, Vol. 57 Issue 10, p556 

    Stress measurement and analysis were performed on the outer wall of an urban buried X65 gas pipeline to obtain the stress distribution law of the pipeline. The welding residual stresses of the axial and girth welds were measured by the X-ray diffraction method and the effect factors of the...

  • Evaluation of Residual Stresses Relaxation by Post Weld Heat Treatment Using Contour Method and X-ray Diffraction Method. Xie, P.; Zhao, H.; Wu, B.; Gong, S. // Experimental Mechanics;Sep2015, Vol. 55 Issue 7, p1329 

    The residual stresses in electron beam welded Titanium alloy before and after post weld heat treatment (PWHT) are measured by both of the contour method and X-ray diffraction method. The application of X-ray diffraction method on the surface of welded structure was used to confirm the results of...

  • Volumetric Measurement of Residual Stress Using High Energy X-Ray Diffraction. Whitesel, R.; McKenna, A.; Wendt, S.; Graya, J. // AIP Conference Proceedings;2016, Vol. 1706 Issue 1, p1 

    We present results and recent developments from our laboratory, bench-top high energy x-ray diffraction system (HEXRD), between diffraction energies 50 and 150 KeV, to measure internal strain of moderately sized objects. Traditional x-ray strain measurements are limited to a few microns depth...

  • Analysis of Residual Stress-Induced Distortions of Thin Sheet Structures in Multi-Step Milling. Fergani, Omar; Xiaohui Jiang; Welo, Torgeir // AIP Conference Proceedings;2016, Vol. 1769 Issue 1, p1 

    In high-precision product industries, controlling residual stress-induced distortions in large, thin-walled components is critical in order to produce high-quality light-weight components. Understanding the residual stress history is key to deal with this problem. In this study, the residual...

  • Gamma Profile Analysis for Stress, Texture and Grain Size. He, Bob B. // Advanced Materials Research;2014, Vol. 996, p209 

    Two-dimensional X-ray diffraction pattern can be described by the diffraction intensity distribution in both 2&θ and ɣ directions. The 2D pattern can be reduced to two kinds of profiles: 2&θ- profile and ɣ-profile. The 2&θ-profile can be evaluated for phase identification, crystal...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics