Abstract
The dynamic characteristics of imperfect pipes conveying fluid in the pre-buckling and post-buckling states are investigated. In this paper, the novel motion equation of fluid-conveying imperfect pipe supported at both ends is derived by considering the geometric imperfection and the geometric nonlinearity induced by mid-plane stretching. The imperfect configurations are chosen as the first bucked modes of pined–pined and clamped–clamped pipes. The exactly analytical solutions for static response are obtained due to the fluid flow. In the linear vibration analysis, the equation is discretized by the Galerkin method and solved as a linear eigenvalues problem. Excellent agreement is observed between the present solution and the available literature. Compared with the supercritical pitchfork bifurcation of the perfect pipe conveying fluid, the results show that the cusp bifurcation occurs in the imperfect pipe when increasing the flow velocity. In the post-buckling state, there are three equilibrium configurations composed of two asymmetry stable branches and an unstable branch. The critical velocity firstly increases and then decreases when the imperfect amplitude increases. The numerical results indicate that initial imperfect amplitude and flow velocity have a complex influence on the natural frequency of the imperfect pipe. The first natural frequency increases when the initial imperfect amplitude increases. The three branches of the imperfect pipe in the post-buckling state provide more interesting and essential dynamic behaviors.
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Abbreviations
- \(L\) :
-
The pipe length
- \(m_{{\text{p}}}\) :
-
Mass per unit length of pipe
- \(E\) :
-
Young’s modulus
- \(E^{ * }\) :
-
Viscoelastic damping
- \(I\) :
-
Second moment of area
- \(A_{{\text{p}}}\) :
-
Cross-sectional area
- \(m_{{\text{f}}}\) :
-
Mass per unit length of pipe
- \(U\) :
-
Flow velocity of fluid
- \(T\) :
-
External applied tension
- \(W_{{0}} (x)\) :
-
The initial deformation
- \(W(x,t)\) :
-
The lateral displacements
- \(\varepsilon_{{{\text{xx}}}}\) :
-
Axial strain induced by bending deformation
- \(V_{{\text{p}}}\) :
-
The strain energy of the pipe
- \(T_{{\text{p}}}\) :
-
The kinetic energy of the pipe
- \(T_{{\text{f}}}\) :
-
The fluid kinetic energy
- \(W_{{{\text{vis}}}}\) :
-
The virtual work done by the damping force
- \(W_{{\text{T}}}\) :
-
The work done by the externally applied tension
- \(\varepsilon_{{\text{H}}}\) :
-
Averaged axial strain induced by lateral displacement
- \(T_{{\text{H}}}\) :
-
The axial force induced by lateral displacement
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Acknowledgements
The authors gratefully acknowledge the support provided by the National Natural Science Foundation of China (Grant No. 11802235), National Key Basic Research Program of China (Grant No. 613268) and Aeronautics Power Foundation Program of China (Grant No. 6141B090320).
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Li, Q., Liu, W., Lu, K. et al. Flow-induced buckling statics and dynamics of imperfect pipes. Arch Appl Mech 91, 4553–4569 (2021). https://doi.org/10.1007/s00419-021-02023-y
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DOI: https://doi.org/10.1007/s00419-021-02023-y