Creep Rupture at Strain Concentrations Limitations of the Fracture Mechanics Approach
The difficulties of extending fracture mechanics concepts to the cracking and fracture of metal components under creep conditions are considered, and the additional complications — both mechanical and metallurgical — which apply to materials under prolonged exposure to elevated temperatures, discussed. The role of notch-rupture testing and features of creep crack initiation and propagation are described, and suggestions made of the form of ‘fracture-toughness’ parameter which might be applicable to fracture at elevated temperatures.
KeywordsFracture Toughness Creep Strain Creep Strength Creep Condition Strain Concentration
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- Weiss, V., and S. Yukawa: Critical Appraisal of Fracture Mechanics. ASTM STP 881, 1–29 (1965).Google Scholar
- Paris, P. C., and C. M. Sih: Stress Analysis of Cracks. ASTM STP 881, 30–83 (1965).Google Scholar
- Williams, M. C.: The Kinetic Energy Contribution to Fracture Propagation in a Linearly Viscoelastic Material. Int. J. Fracture Mech. 4 (1), 69–78 (1968).Google Scholar
- McClintock, F. A., andG. R. Irwin: Plasticity Aspects of Fracture Mechanics. ASTM STP 881, 84–132 (1965).Google Scholar
- Wells, A. A., and F. H. McBride: Application of Fracture Mechanics to High-temperature Creep-Rupture. Can. Metall. Q. 6 (4), 347–368 (1967).Google Scholar
- King, R. H., and A. I. Smith: Thermal-Fatigue Processes and Testing Techniques. Symp. Thermal and High Strain Fatigue/London: Institute of Metals and Iron and Steel Institute, 1966.Google Scholar
- Robson, K.: Unpublished results.Google Scholar
- Garofalo, F.: Creep-Rupture Behaviour of Notched and Unnotched of Type 304, 316 and 321 Austsnitic Stainless Steels. Proc. Amer. Soc. Test. Mater. 59, 957–981 (1959).Google Scholar
- Thum, A., and K. Richard: Embrittlement and Damage of Heat Resisting Steels in Creep. Arch. Eisenhutt. Wes. 15, 33–45 (1941–1942). In GermanGoogle Scholar
- Knott, J. F., and A. H. Cottrell: Notch Brittleness in Mild Steel. J. Iron Steel Inst. 249–260 (1963).Google Scholar
- Day, M. F.: Unpublished results.Google Scholar