Vibration analysis and crack identification of cantilever pipe with a circumferential part-through crack
Hu JiaShun1; Sun WenYong1; Zhou Jing2
1. Research Department of Safety Technology, CNPC Research Institute of Safety & Environment Technology, Beijing, 100083, China)(2. The State key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 110624, China)
Abstract：Abstract: The local flexibility equations of the pipe with a circumferential part-through crack that subjected to axial force, shearing force and bending moment were derived by using of theories of linear fracture mechanics and stress energy release principle. An adaptive Simpson quadrature-revisted was used to perform the numerical integration to obtain the flexibility coefficients. A finite element model for cracked pipe was established to conduct the vibration analysis for cracked cantilever pipe. In addition, crack identifiation for a cracked cantilever pipe was investigated based on contour plots of frequency ratio as function of crack location and crack depth. The results show that the proposed crack model conquers the shortcoming that existing models usually apply for calculating special load or non-hollow structure, and the contour diagram can identify crack location and depth effectively.
2011, Vol. 30 
