✅ 1. Simplified Modeling Approach in Abaqus

For a screw pull-out in wood:

• 2D axisymmetric model is not suitable, because a screw has helical threads and withdrawal involves non-axisymmetric loading (thread engagement, friction, etc.).
• Instead, consider: 2D plane strain model (if looking at a cross-section, ignoring thread helix). 3D model with simplified thread profile, e.g., triangular or trapezoidal thread approximation.
• ✅ If you're okay with neglecting actual helical geometry, you can simulate a single-thread ring and use symmetry (but still 3D) for efficient modeling.

✅ 2. Is Interference Fit Available in Abaqus?

Yes.

• Abaqus supports interference fit via: "Interference Fit" interaction (available in step module → interaction → mechanical contact → interference fit). Commonly used in press-fit problems like shafts and bores.

⚠️ However, for screws, interference fit is not the right approach—screws rely on thread engagement and friction, not radial pressure like a press-fit.

✅ 3. What is Useful Instead of Interference Fit?

• Use surface-to-surface contact between thread flanks and wood.
• Define: Frictional contact (static coefficient, e.g., ~0.5–0.8 depending on wood moisture). Possibly cohesive zone modeling if withdrawal failure is by progressive damage.
• If modeling without threads: Use simplified cylindrical or conical shape with bonded or frictional contact to estimate force needed to pull out.

🛠️ Tips for Simplification

• Start with a 2D plane strain model with a cylindrical "screw" inserted into a block of wood.
• Apply displacement load to simulate pull-out.
• Measure reaction force to find withdrawal load.
• Use elastic-plastic material model for wood (orthotropic if going advanced).
• For better accuracy, parametrize interface stiffness or embed discrete springs to mimic thread engagement.