Abstract
This paper is to analyze the vibration characteristics of a metal rubber medium-thick cylindrical shell (MR-MTCS) influenced by material anisotropy. The parameters of the metal rubber (MR) are determined by the inclined helix-pyramid model (IHPM). The control equations for MR-MTCS are determined by first-order shear deformation theory (FSDT) and Rayleigh–Ritz method. The results show that the anisotropy of MR has a significant effect on the vibration characteristics of MR-MTCS. Among them, the anisotropy of Young's modulus has the most significant effect on the vibration characteristics. In addition, the effect of MR anisotropy on the vibration characteristics of MR-MTCS increases with the increase of axial half-wave number m and decreases with the increase of axial wave number n.
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Abbreviations
- h :
-
Cylindrical shell thickness (m)
- R :
-
The radius of the middle surface of the cylindrical shell (m)
- L :
-
Cylindrical shell length (m)
- u, v, w :
-
Displacement of the shell along x, θ, z direction (m)
- ψ x, ψ θ :
-
Rotation angles normal to the direction of x- and θ-axis (rad)
- a x , a θ :
-
Lame coefficient in the x, θ direction in the middle surface (−)
- R x, R θ :
-
The radius of curvature in the x, θ direction in the middle surface (m)
- A x, A θ :
-
Lamé coefficient along x, θ direction in cylindrical shell (−)
- n m :
-
Number of screws of equivalent spring unit (−)
- E i :
-
Young's modulus of MR (MPa)
- ε x, ε θ :
-
Normal strain of shell along x, θ direction (−)
- γ xθ, γ θz, γxz :
-
Shear strain of the shell normal to the z-axis, x-axis and θ-axis (−)
- k u ,k v ,k w :
-
Stiffness coefficient along x, θ, z direction
- κ x, κ θ :
-
Slope of strain εx, εθ along the z-direction (−)
- E, E m :
-
Young's modulus of cylindrical shell and metal wire (GPa)
- μ :
-
Poisson's ratio of MR (−)
- μ m :
-
Poisson's ratio of metal wire
- ρ :
-
Density of the shell (kg/m3)
- N, Q s :
-
Membrane stresses (Pa)
- M :
-
Membrane moments (Pa.m)
- K s :
-
Transverse shear correction factor (−)
- U,U spr :
-
Strain energy of the shell and elastic support (N.m)
- T :
-
Shell kinetic energy (N.m)
- δ :
-
Variable score symbols (−)
- t,T 0,T 1 :
-
Times, starting moment, ending moment (s)
- ω :
-
Round frequency(rad)
- n :
-
Circumferential wave number (−)
- m :
-
Axial half wave number (−)
- δ kl :
-
Kronecker constant (−)
- f :
-
Natural frequency of MR-MTCS (Hz)
- η :
-
Modal loss factor of MR-MTCS
- β :
-
Half cone angle of equivalent spring unit (rad)
- \({\upeta }_{{\text{ m,n}}}^{{\text{ N}}}\) :
-
Modal loss factor at N (%)
- \({\text{f}} _{{\text{m,n}}}^{{\text{ N}}}\) :
-
Natural frequency at N (Hz)
- W L ,W U :
-
Mechanical work during loading and unloading (N.m)
- ρm, \({\overline{\rho }} \) :
-
Relative density of MR samples and blanks (%)
- \(\mu_{c} { }\) :
-
Friction coefficient of 304 stainless steel (%)
- a, b :
-
Load correction factor (−)
- α :
-
Guidance angle (rad)
- d, D :
-
Wire diameter and helix diameter (mm)
- N :
-
Polynomial truncation number (−)
- C :
-
Spring index of the helix unit (−)
- φ , \({\overline{{\varphi }}}\) :
-
Inclination angle of the helix unit and its mean value (rad)
- r :
-
Molding ratio of MR(−)
- K T :
-
Axial stiffness of the helix unit (N/m)
- K V :
-
Tangential stiffness of the helix unit (N/m)
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The authors thank Haiyang Liu for helpful discussion.
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YB contributed to conceptualization, methodology, software, and writing—original draft. HL contributed to supervision, project administration, funding acquisition, and writing—review and editing.
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Appendices
Appendix A
Equation (19) for M, K and Kspr has the following expressions:
Appendix B
Expressions exist in Appendix A as shown below:
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Bai, Y., Li, H. Vibration characteristics analysis of anisotropic metal rubber medium-thick cylindrical shells. Arch Appl Mech 93, 3553–3579 (2023). https://doi.org/10.1007/s00419-023-02453-w
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DOI: https://doi.org/10.1007/s00419-023-02453-w