Abstract
We study finite inhomogeneous deformations of a helical spring with a rectangular cross-section and a long cuboid. Two surfaces of the spring or the cuboid are joined to obtain a hollow cylinder. When body forces are absent the equilibrium equations reduce to ordinary differential equations. The stress-strain states are the same in each cross-section. The proposed deformations correspond to an inflation, an extension and a torsion of the obtained hollow cylinders. If the obtained cylinders are free of external applied loads, then they have residual stresses.
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Abbreviations
- r, \(\phi\), z :
-
Cylindrical coordinates in reference configuration
- R, \({\varPhi }\), Z :
-
Cylindrical coordinates in deformed configuration
- \(\mathbf {e}_r\), \(\mathbf {e}_\phi\), \(\mathbf {e}_z\) :
-
Cylindrical bases in reference configuration
- \(\mathbf {e}_R\), \(\mathbf {e}_{\varPhi }\), \(\mathbf {e}_Z\) :
-
Cylindrical bases in deformed configuration
- \(\mathbf {r}\), \(\mathbf {R}\) :
-
Position vectors of point of body in reference and deformed configurations
- \(\chi\), \(\upsilon\), \(\zeta\) :
-
Lagrangian coordinates
- \(\chi _1\), \(\chi _2\), \(\upsilon _1\), \(\upsilon _2\), h, \(\alpha\) :
-
Initial geometrical parameters
- a, b, c, d, \(\tau\) :
-
Deformation parameters
- \(\mathbf {E}\) :
-
Unit tensor
- \(\mathbf {C}\) :
-
Deformation gradient
- \(\mathbf {G}\), \(\mathbf {g}\), \(\mathbf {g}^{-1}\) :
-
Cauchy–Green, Almansi, Finger strain measures
- \(I_1\), \(I_2\), \(I_3\) :
-
Invariants of Cauchy–Green strain measure
- \(\mathbf {T}\) :
-
Cauchy stress tensor
- W :
-
Strain-energy function
- \(\mathbf {F}\), \(\mathbf {M}\) :
-
Resultant force and resultant couple on cross-section
- \(q_1\), \(q_2\) :
-
Pressures on inner and outer surfaces of cylinder
- \(R_1\), \(R_2\) :
-
Inner and outer radii of cylinder
- p :
-
Hydrostatic pressure for incompressible material
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Acknowledgements
The research was supported by Russian Foundation for Basic Research (Grant 15-01-01492 A).
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Kolesnikov, A.M. Deformations of helical spring and cuboid into hollow cylinders. Meccanica 53, 2161–2170 (2018). https://doi.org/10.1007/s11012-017-0805-z
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DOI: https://doi.org/10.1007/s11012-017-0805-z