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- Title
APPLICATION OF THE J INTEGRAL IN THE STUDY OF THE CRACK LENGTH AND TEMPERATURE OF A CANNON BARREL.
- Authors
CALIMANESCU, IOAN; STAN, LIVIU-CONSTANTIN
- Abstract
Perhaps the most accurate and elegant method for computing the energy release rate is to calculated the J integral by converting the line integral into a domain integral which can easily be calculated using the known finite element shape functions. The problem illustrates the case of a crack in a cannon barrel, together with the relevant geometry against crack length defined from the bore of the cannon. This crack geometry is the most dangerous integrity case for the cannon barrel. In this research, 155 mm cannon barrel with one crack with lengths of 4 mm, 8 mm and 12 mm on inner surface is firstly structurally analyzed at room temperature, and subsequently coupled thermo-structurally analyzed considering 4 scenarios, where the crack length was deemed to be 4 mm, the temperature of the inner surface was 1000°C, 1250°C, 1500°C, 2000°C. The numeric model presented in this paper, provides consistent and reasonable results for the dependency of stress intensity factor to the crack length and temperature of a cannon barrel using the J integral. The temperature fields inside the cannon barrel (and, generalizing, inside any circular structure with thick walls) tends to ameliorate the stress fields existing on the crack tip and pushing the calculated KI downward and thus improving the crack behavior.
- Subjects
FINITE element method; ENERGY transfer; MATERIAL fatigue; NUMERICAL analysis; MATHEMATICAL models
- Publication
Annals (Constanţa Maritime University), 2012, Vol 13, Issue 17, p85
- ISSN
2067-0427
- Publication type
Article