Crack propagation and thermal shock damage in graphite disks heated by moving electron beam
✍ Scribed by C. Schubert; H.A. Bahr; H.J. Weiss
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 1009 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0008-6223
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✦ Synopsis
The thermal shock disk testing method developed by Sato has been modified to use a moving electron beam as a heat source. The electron beam furnace used in this study allows the testing of samples up to 300 mm in diameter and 30 mm thickness, which is sufficiently large for coarse-grained graphites. The method yields results on thermal shock damage characterized by the final crack length in addition to thermal shock resistance and thermal shock fracture toughness. Experimental results on final crack length are explained by means of an energy balance which yields information on stable and unstable crack propagation. The dependence of fracture toughness on crack length as expressed by the so-called .H curves has been taken into account.