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Assignment 3

Assignment 3. Stent expansion analysis. Relating 2d to 3d. Pressure applied to balloon – transmitted to stent Balloon is initially folded. Cylinder under internal pressure. Circ. force. Circ. dist. R. P. Axial distance. Circumferential force, F = PR

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Assignment 3

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  1. Assignment 3 Stent expansion analysis

  2. Relating 2d to 3d • Pressure applied to balloon – transmitted to stent • Balloon is initially folded Cylinder under internal pressure Circ. force Circ. dist R P Axial distance Circumferential force, F = PR CHECK UNITS! This is per unit axial length

  3. Using symmetry BCs • We assume stent can be modelled as:

  4. Using symmetry BCs • Constrain DOFs on symmetry boundaries Ux = 0 ?? ?? y Uy = 0 x

  5. Coupled DOFs • To allow an arbitrary displacement but fix all nodes to have the same value, use CP command: NSEL,s,loc,x,LENGTH CP,1,ux,all or Preprocessor>Coupling / Ceqn>Couple DOFs

  6. Deforming the strut • Either: • Apply a known force and calculate the displacement • Or: • Apply a displacement and calculate the resultant force, using: FSUM command General Postproc>Nodal Calcs>Total Force Sum

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