Overview
This product provides a ready-to-use Abaqus simulation package for analyzing boot seals in automotive constant velocity joints. It demonstrates large-deformation hyperelastic behavior, 3D deformable-to-deformable contact, and self-contact using a neo-Hookean material model implemented via a robust Fortran UMAT subroutine. Validate your seal designs under extreme angulation and compression scenarios with this verified solution.

Key Features

✅ Realistic Boot Seal Simulation

• Models angulation of a steering shaft (20° rotation) and circumferential travel.
• Captures self-contact on inner/outer surfaces and shaft-seal interference.
• Hybrid brick elements with variable thickness (3.0–4.75 mm) for accuracy.

✅ Advanced Material Modeling

• Neo-Hyperelastic material defined by:
  • C10=0.752MPa
  • D1=0.026MPa-1 (slight compressibility).
• Alternative models included: Marlow & Valanis-Landel hyperelasticity.

✅ Efficient Contact Handling

• 3D finite-sliding contact between deformable seal and rigid shaft.
• Self-contact algorithms for internal/external surface interactions.
• Supports both node-to-surface and surface-to-surface contact.

✅ UMAT Subroutine

• Fortran code (bootseal_umat.f) for neo-Hookean hyperelasticity.
• Computes Cauchy stress (σ) and Jacobian (C):

• Matches Abaqus built-in material results exactly.

Model Workflow

1. Geometry
   • Corrugated boot seal (half-model symmetry).
   • Rigid shaft (14 mm radius).
2. Loading Steps
   • Step 1: Resolve interference fit (shrink-fit assembly).
   • Step 2: 20° shaft angulation.
   • Step 3: Full circumferential travel.
3. Results
   • Stretching/compression zones and self-contact regions.
   • Maximum principal stress contours (critical for fatigue analysis).

What’s Included

• Input Files
  • Job-1.inp: 2D analysis with UMAT.

Source Code

• BOOT-SEAL-UMAT.for : Fortran UMAT for neo-Hookean hyperelasticity.
• Validation
  • Identical results to built-in Abaqus material models

Applications

• Durability prediction of rubber seals under dynamic loading.
• Contact pressure optimization for leakage prevention.
• Self-contact analysis in flexible components.

Technical Specifications

Why Choose This Package?

• Save Development Time: Skip UMAT coding—plug & play.
• Verified Robustness: Handles large rotations/contact seamlessly.
• Extensible: Modify UMAT for custom hyperelastic models.

This model was made from Abaqus documentation files.