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1983, 18, 23-33. 23. , Crack propagation in an elastic solid. Part 2: Non-uniform rate of extension. ~ Mech. ~ Solids. 1983, 1972, 20, 141-52. 24. , On the crack propagation with variable velocity. Int. ~ Frac •• 1975, 11, 47-56. 25. E 399-74 Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials. 1976 Annual Book of ASTM Standards, ASTM, Philadelphia, 1976, Part 10, 471-90. 26. Takahashi, K. , A parameter influential in dynamic fracture. In Dynamic Fracture. eds. H. Homma and Y.

It is felt that this effect should also largely be reduced in thermal shock round shaped specimens. CONCLUSIONS 1. 2. 3. The fracture toughness at crack arrest of a C-Mri-Nb steel is significantly lower than the fracture toughness at crack initiation even when the failure mode corresponds to brittle cleavage fracture. A flexible thermal shock experiment applied to small-sized specimens has been described in some detail. It is shown that, in spite of widely different conditions, the ASTM method for determining crack arrest fracture toughn~ss and a novel technique based on thermal shock lead to consistent results.

57 ON THE PRACTICAL SIGNIFICANCE OF CRACK ARREST THOMAS VARGA and GUNTHER SCHNEEWEISS Institute for Testing and Research in Materials Technology (TVFA) and Department for Material Science and Testing at the Technical University of Vienna A - 1040 Wien, Karlsplatz 13 INTRODUCTION In case crack initiation and propagation in a component or structure cannot be excluded, the safety against fracture depends on the arrest of the running crack. The practical significance of crack arrest will be demonstrated concerning ships, airplanes, pipelines, penstocks and mentioned for components of power plants.

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