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This module estimates the compression stiffness and shear strains for rubber pads. Cylindrical, conical and curved conicals can be modeled with user input ID, OD, height, and edge/side contours. The top and bottom surfaces can be bonded to rigid members or free. A nonlinear, Neo-Hookean FEM solution is used.


The non-linear Neo-Hookean solution method.



Bonded Rubber Compression Stiffness — Final Nonlinear FE

Bonded Rubber Compression Stiffness — Final Nonlinear FE

Ready
Final deflection: —
Final force: —
Effective stiffness k: —
Iterations last step: —

End BCs: z=0 and z=H bonded to plates, ur=0 both plates, top driven down.
Nonlinear axisymmetric FE. Material = compressible neo-Hookean with μ = G and κ = Kbulk. Volume lock is resisted by high κ. Load steps & mesh density are user-tunable.
Initial Part Geometry (r–z cross-section)
Geometry is symmetric about r=0. Blue outline is undeformed part before compression.
Bonded Compression Shape & Shear
Initial Current / Final Shear γrz (blue = low, red = high)
Load vs Deflection
Each dot is the converged nonlinear state for that total compression.