Vdi 2230 2021 Link

VDI 2230:2021 – Systematic Calculation of High-Duty Bolted Joints

D. Minimum Thread Engagement

For bolts screwed into soft materials (e.g., aluminum $\le 200$ MPa tensile strength), VDI 2230:2021 mandates a minimum engagement length $m = 2.0 \times d$ for coarse threads and $1.8 \times d$ for fine threads, unless a thread stripping check proves otherwise.

4. New Calculation Path for Short Thread Engagement (Lateral Loads)

Short engagement lengths (e.g., bolt-in-insert designs or thin-walled castings) previously forced engineers into non-linear FEA. VDI 2230:2021 provides a semi-analytical method to calculate lateral joint stiffness (δlat) and permissible transverse slip. This is a game-changer for sensor housings and electric motor end shields. vdi 2230 2021

Title

VDI 2230:2021 — Systematic Calculation of Highly Stressed Bolted Joints (English summary) VDI 2230:2021 – Systematic Calculation of High-Duty Bolted

3. Thermal and Corrosion Interactions

• Temperature dependence: New models for relaxation and preload loss at elevated temperatures (>150°C) and cryogenic conditions.
• Corrosion-assisted loosening: Guidance on how corrosion products affect friction and self-loosening under vibration.