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Title: System and method for measuring residual stress

Abstract

The present invention is a method and system for determining the residual stress within an elastic object. In the method, an elastic object is cut along a path having a known configuration. The cut creates a portion of the object having a new free surface. The free surface then deforms to a contour which is different from the path. Next, the contour is measured to determine how much deformation has occurred across the new free surface. Points defining the contour are collected in an empirical data set. The portion of the object is then modeled in a computer simulator. The points in the empirical data set are entered into the computer simulator. The computer simulator then calculates the residual stress along the path which caused the points within the object to move to the positions measured in the empirical data set. The calculated residual stress is then presented in a useful format to an analyst.

Inventors:
 [1]
  1. Los Alamos, NM
Issue Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
OSTI Identifier:
874833
Patent Number(s):
6470756
Assignee:
The Regents of the University of California (Oakland, CA)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; measuring; residual; stress; determining; elastic; cut; path; configuration; creates; portion; free; surface; deforms; contour; measured; determine; deformation; occurred; defining; collected; empirical; data; set; modeled; computer; simulator; entered; calculates; caused; move; positions; calculated; useful; format; analyst; residual stress; measuring residual; /73/

Citation Formats

Prime, Michael B. System and method for measuring residual stress. United States: N. p., 2002. Web.
Prime, Michael B. System and method for measuring residual stress. United States.
Prime, Michael B. Tue . "System and method for measuring residual stress". United States. https://www.osti.gov/servlets/purl/874833.
@article{osti_874833,
title = {System and method for measuring residual stress},
author = {Prime, Michael B},
abstractNote = {The present invention is a method and system for determining the residual stress within an elastic object. In the method, an elastic object is cut along a path having a known configuration. The cut creates a portion of the object having a new free surface. The free surface then deforms to a contour which is different from the path. Next, the contour is measured to determine how much deformation has occurred across the new free surface. Points defining the contour are collected in an empirical data set. The portion of the object is then modeled in a computer simulator. The points in the empirical data set are entered into the computer simulator. The computer simulator then calculates the residual stress along the path which caused the points within the object to move to the positions measured in the empirical data set. The calculated residual stress is then presented in a useful format to an analyst.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

Works referenced in this record:

Cross-Sectional Mapping of Residual Stresses by Measuring the Surface Contour After a Cut
journal, November 2000


Residual Stress Measurement by Successive Extension of a Slot: The Crack Compliance Method
journal, February 1999


An estimate of the residual stress distribution in the vicinity of a propagating fatigue crack
journal, January 1979


Analysis of residual stresses in railroad car wheels based on destructive test measumenents
journal, October 1989


The Plasma Fluidized Bed
report, July 2000