Vibration characteristics analysis of pipe with a part-through straight front crack

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (4) : 21-25.

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Vibration characteristics analysis of pipe with a part-through straight front crack

Hu JiaShun1 ; Feng Xin2 ; Zhou Jing2

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Abstract

Abstract: The local flexibility equations of the pipe with a crack that straight front and part-through-the-thickness 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. These conquer the shortcoming that existing methods usually apply for calculating special load or non-hollow structure. The model test results from Naniwadekar et al were used to validate the accuracy of the proposed local flexibilit. Moreover, a finite element model for cracked pipe was established to conduct the vibration analysis for cracked pipe-like structure. The vibration characteristics of a cantilever pipe and a simple support pipe were analyzed. The results show that crack location, crack severity all have influence on the natural frequencies of cracked pipe-like structure.

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Vibration analysis / local flexibility / stress intensity factor / pipe / crack

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Hu JiaShun;Feng Xin;Zhou Jing. Vibration characteristics analysis of pipe with a part-through straight front crack[J]. Journal of Vibration and Shock, 2011, 30(4): 21-25