Initial results of the influence of biaxial loading on fracture toughness
- Oak Ridge National Lab., TN (United States)
A testing program to examine the influence of biaxial loads on the fracture toughness of shallow-flaw specimens under conditions prototypic of a reactor pressure vessel was begun. Existing data suggest that shallow-flaw specimens under biaxial loading will exhibit a toughness reduction compared to comparable uniaxial specimens. Quantification of this toughness reduction is the main goal of the biaxial fracture toughness program. A cruciform specimen with a two-dimensional shallow through-thickness flaw under a biaxial load ratio of 0.6:1 was used for biaxial fracture toughness testing. The critical fracture load for each specimen was approximately the same, but the uniaxial specimen withstood substantially more deformation at failure than did the biaxial specimens. Three-dimensional, elastic-plastic, finite-element posttest analyses were necessary to estimate fracture toughness. In all cases, agreement between the measured and computed load vs deformation responses was excellent. Toughness values for the cruciform specimens were compared with data from previously tested, deep- and shallow-crack specimens. Results from these tests indicate that the shallow-crack toughness increase is partially, but not totally, removed by the application of biaxial loading. However, additional data are required to solidify these conclusions. A proposed test matrix for additional uniaxial and biaxial testing is described. This report has been designated HSST Report No. 138.
- Research Organization:
- Nuclear Regulatory Commission, Washington, DC (United States). Div. of Engineering; Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- Nuclear Regulatory Commission, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 10166497
- Report Number(s):
- NUREG/CR--6036; ORNL/TM--12349; ON: TI93016056
- Country of Publication:
- United States
- Language:
- English
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