Fracture behavior of W based materials. Final report
- Yale Univ., New Haven, CT (United States). Dept. of Mechanical Engineering
This report describes the results of a program to investigate the fracture properties of tungsten based materials. In particular, the role of crack velocity on crack instability was determined in a W-Fe-Ni-Co ``heavy alloy`` and pure polycrystalline tungsten. A considerable effort was expended on the development of an appropriate crack velocity gage for use on these materials. Having succeeded in that, the gage technology was employed to determine the crack velocity response to the applied level of stress intensity factor at the onset of crack instability in pre-cracked specimens. The results were also correlated to the failure mode observed in two material systems of interest. Major results include: (1) unstable crack velocity measurements on metallic specimens which require high spatial resolution require the use of brittle, insulating substrates, as opposed to the ductile, polymer based substrates employed in low spatial resolution measurements; and (2) brittle failure modes, such as cleavage, are characterized by relatively slow unstable crack velocities while evidence of high degrees of deformation are associated with failures which proceed at high unstable crack velocities. This latter behavior is consistent with the predictions of the modeling of Hack et al and may have a significant impact on the interpretation of fractographs in general.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Yale Univ., New Haven, CT (United States). Dept. of Mechanical Engineering
- Sponsoring Organization:
- Department of Defense, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10142217
- Report Number(s):
- LA-SUB-94-23; ON: DE94009937; TRN: 94:008543
- Resource Relation:
- Other Information: PBD: 30 Sep 1991
- Country of Publication:
- United States
- Language:
- English
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