한국정밀공학회지 (Journal of the Korean Society for Precision Engineering)
- 제14권12호
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- Pages.160-165
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- 1997
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- 1225-9071(pISSN)
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- 2287-8769(eISSN)
매우 취성인 재료의 동적 파괴인성치 결정법
Determination of Dynamic Fracture Toughnesses for very Brittle Materials
초록
The instrumented Charpy impact test is generally used to evaluate the dynamic fracture toughnesses for varying engineering materials. However, the test is known to be difficult to evaluate the dynamic fracturetoughnesses for very brittle materials because of the small crack initiation load which may be engulfed by the inertia load of the instrumented tup. To evaluate the dynamic fracture toughnesses of very brittle materials, such as chalk or plaster,it is thus, necessary to develop a load sensitive instrumented tup. In this study, a polymer tup, which has very small Young's modulus comparing to one of the conventional steel tup, is used for the instrumented Charpy impact test, and a proper testing method to evaluate the dynamic fracture behavior of very brittle materials is developed. The results show that the developed method can measure rapidly changing loads from the moment of contact between the tup and the specimen to dynamic crack initiation of the very brittle materials.
키워드