DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: System and method for testing true stress and true strain

Abstract

A true stress testing system broadly comprising a force input machine, an imaging system, and a computer. The imaging system includes a light source for projecting a light beam at the specimen in a first direction and a camera positioned on an opposite side of the specimen for receiving portions of the light beam not blocked by the specimen such that a shadow image of the specimen is created via the camera. The computer may determine a minimum dimension of the specimen perpendicular to the first direction at a point in time over a plurality of points along the force axis via the shadow image of the specimen such that the processor accounts for changes in position of the minimum dimension along the specimen. A true stress of the specimen may then be determined according to the minimum dimension of the specimen perpendicular to the first direction at the point in time.

Inventors:
Issue Date:
Research Org.:
Kansas City Plant (KCP), Kansas City, MO (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1735236
Patent Number(s):
10768082
Application Number:
16/404,918
Assignee:
Honeywell Federal Manufacturing & Technologies, LLC (Kansas City, MO)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
H - ELECTRICITY H04 - ELECTRIC COMMUNICATION TECHNIQUE H04N - PICTORIAL COMMUNICATION, e.g. TELEVISION
DOE Contract Number:  
NA0000622
Resource Type:
Patent
Resource Relation:
Patent File Date: 05/07/2019
Country of Publication:
United States
Language:
English

Citation Formats

Wenski, Edward G. System and method for testing true stress and true strain. United States: N. p., 2020. Web.
Wenski, Edward G. System and method for testing true stress and true strain. United States.
Wenski, Edward G. Tue . "System and method for testing true stress and true strain". United States. https://www.osti.gov/servlets/purl/1735236.
@article{osti_1735236,
title = {System and method for testing true stress and true strain},
author = {Wenski, Edward G.},
abstractNote = {A true stress testing system broadly comprising a force input machine, an imaging system, and a computer. The imaging system includes a light source for projecting a light beam at the specimen in a first direction and a camera positioned on an opposite side of the specimen for receiving portions of the light beam not blocked by the specimen such that a shadow image of the specimen is created via the camera. The computer may determine a minimum dimension of the specimen perpendicular to the first direction at a point in time over a plurality of points along the force axis via the shadow image of the specimen such that the processor accounts for changes in position of the minimum dimension along the specimen. A true stress of the specimen may then be determined according to the minimum dimension of the specimen perpendicular to the first direction at the point in time.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {9}
}

Works referenced in this record:

Detection of compressive residual stresses using the method of caustics
patent, September 1990