ISSN:
1013-9826
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:
The reliability of welded pressure pipe with circumferential surface crack was calculated byusing 3-D stochastic finite element method. This method has overcome the shortcomings of conservativeresults in safety assessment with deterministic fracture mechanics method. The calculation of reliabilitywas based on 3-D elastic-plastic stochastic finite element program which was developed by ourselves.The effects of variables such as bending moment, the inner pressure on the structure reliability werediscussed. The calculation results indicate that the bending moment has great effect on the reliability ofthe welded pipe, and the inner pressure has little effect on the reliability of the welded pipe if the innerpressure is less than 10MPa. If the mean value of the inner pressure changed from 0.5MPa to 30MPa, thefailure probability will changes from 10-6 to 10-2. The bending moment also has great effect on thereliability. When the mean value of moment is changed from10000 Nm to 15000 Nm, the failureprobability of the welded pipe increases dramatically for the same inner pressure. Irrespective of thechanging of moment, the pipe has higher reliability if the inner pressure is less than 6 MPa. The methodhas put 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/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2513.pdf
