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Title: Fracture toughness determination using spiral-grooved cylindrical specimen and pure torsional loading

Abstract

A method for determining fracture toughness K.sub.IC of materials ranging from metallic alloys, brittle ceramics and their composites, and weldments. A cylindrical specimen having a helical V-groove with a 45.degree. pitch is subjected to pure torsion. This loading configuration creates a uniform tensile-stress crack-opening mode, and a transverse plane-strain state along the helical groove. The full length of the spiral groove is equivalent to the thickness of a conventional compact-type specimen. K.sub.IC values are determined from the fracture torque and crack length measured from the test specimen using a 3-D finite element program (TOR3D-KIC) developed for the purpose. In addition, a mixed mode (combined tensile and shear stress mode) fracture toughness value can be determined by varying the pitch of the helical groove. Since the key information needed for determining the K.sub.IC value is condensed in the vicinity of the crack tip, the specimen can be significantly miniaturized without the loss of generality.

Inventors:
;
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1174387
Patent Number(s):
6,588,283
Application Number:
09/888,937
Assignee:
UT-Battelle, LLC (Oak Ridge, TN) ORNL
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Wang, Jy-An, and Liu, Kenneth C. Fracture toughness determination using spiral-grooved cylindrical specimen and pure torsional loading. United States: N. p., 2003. Web.
Wang, Jy-An, & Liu, Kenneth C. Fracture toughness determination using spiral-grooved cylindrical specimen and pure torsional loading. United States.
Wang, Jy-An, and Liu, Kenneth C. Tue . "Fracture toughness determination using spiral-grooved cylindrical specimen and pure torsional loading". United States. https://www.osti.gov/servlets/purl/1174387.
@article{osti_1174387,
title = {Fracture toughness determination using spiral-grooved cylindrical specimen and pure torsional loading},
author = {Wang, Jy-An and Liu, Kenneth C.},
abstractNote = {A method for determining fracture toughness K.sub.IC of materials ranging from metallic alloys, brittle ceramics and their composites, and weldments. A cylindrical specimen having a helical V-groove with a 45.degree. pitch is subjected to pure torsion. This loading configuration creates a uniform tensile-stress crack-opening mode, and a transverse plane-strain state along the helical groove. The full length of the spiral groove is equivalent to the thickness of a conventional compact-type specimen. K.sub.IC values are determined from the fracture torque and crack length measured from the test specimen using a 3-D finite element program (TOR3D-KIC) developed for the purpose. In addition, a mixed mode (combined tensile and shear stress mode) fracture toughness value can be determined by varying the pitch of the helical groove. Since the key information needed for determining the K.sub.IC value is condensed in the vicinity of the crack tip, the specimen can be significantly miniaturized without the loss of generality.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {7}
}

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