An innovative technique for measuring fracture toughness of metallic and ceramic materials JA. Wang, KC. Liu, DE. McCabe
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- Language:
- English
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- Physical Description:
- 1 online resource (14 pages) illustrations, figures, tables
- Place of Publication:
- West Conshohocken, Pa. ASTM International 2003
- Summary:
- A new method is introduced for measuring fracture toughness, KIC, of materials ranging from metallic alloys to brittle ceramics. A valid value of KIC is determined using a round-rod specimen having a grooved spiral line with a 45° pitch. When this uniquely configured specimen is subjected to pure torsion, an equibiaxial tensile/compressive stress-strain state is created to effectively simulate that of conventional test methods using a compact-type specimen with a thickness equivalent to the full length of the spiral line. KIC values are estimated from the fracture load and crack length with the aid of a 3-D finite element analysis. KIC of a mullite ceramic material yields 2.205 MPa?m, which is 0.2% higher than the vendor's data. KIC of A302B steel is estimated to be 55.8 MPa ?m, which shows higher than compact tension (CT) test value by~2%. 7475-T7351 aluminum yields 51.3 MPa?m, which is higher than vendor's value in the TL orientation by -0.8% and higher than 0.5T-CT value by 6%. Good agreement between the KIC values obtained by different methods indicates the proposed method is theoretically sound and experimental results are reliable
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- Includes bibliographical references
- Online resource; title from publisher's website, viewed March 19, 2017
- Related Work:
- American Society for Testing and Materials. Selected Technical Papers
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