ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In this paper, the reliability of welded pressure pipe with circumferential surface crack wascalculated by using three dimensional stochastic finite element method. This method has overcomethe shortcomings of conservative results in safety assessment with deterministic fracture mechanicsmethod. The calculation of reliability was based on three dimensional elastic-plastic stochastic finiteelement program which was developed by ourselves. The effects of variables such as fracturetoughness, bending moment and the depth of the circumferential surface crack on the structurereliability were also discussed. The calculation results indicate that the crack depth has great effect onthe reliability of the welded pipe. When the mean value of the crack depth is changed from 3mm to7mm, the failure probability of the welded pipe will change from 10-8 to 10-2. The bending momentalso has great effect on the reliability of the welded pipe. When the mean value of moment is changedfrom10000 N.m to 15000 N.m, the failure probability of the welded pipe increases dramatically forthe same circumferential crack depth. Irrespective of the changing of moment, the pipe has higherreliability if the crack depth is less than 5mm(a/t〈0.5, t is the thickness of the pipe). The method hasput forward a new way for safety assessment of welded pipe with circumferential surface crack
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.639.pdf
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