Ensure sufficient clamping force remains under lateral (shear) loads to prevent the clamped parts from sliding against each other.
The maximum assembly preload FMmax is determined from the tightening factor αA and the minimum assembly preload:
When a bolt is tightened, it stretches elastically like a tension spring, while the clamped components compress like a compression spring. δBdelta sub cap B vdi 2230 2021
| Part | Full Title | Focus | |------|------------|-------| | | Joints with one cylindrical bolt | Calculation method for concentric and eccentric clamping, concentric/eccentric loading, with or without preload. | | Part 2 | Joints with several bolts | Load distribution, tightening sequences, and multi-bolted joint systems. |
Allow engineers to map FEA-calculated forces directly into a VDI 2230 verification pipeline. | | Part 2 | Joints with several
The required minimum clamp load, FKerf, is determined with consideration of three primary factors: the required friction grip to transmit a transverse load FKQ, the sealing against a medium FKP, and the prevention of opening FKA of the joint. This step ensures that the connection maintains integrity under working loads, prevents joint separation, and maintains sealing capability when required.
Compute the compliance/stiffness of both the bolt ( δSdelta sub cap S ) and the clamped components ( δPdelta sub cap P This step ensures that the connection maintains integrity
Ensure the bolt is not over-tightened during assembly or over-stressed during operation.
By adopting the 2021 guidelines, you stop designing with "worst-case myths" and start designing with . That means lighter, cheaper, and paradoxically, safer products.
Engineering practices evolve, and the 2021 release of VDI 2230 addressed long-standing ambiguities while refining calculation coefficients. The most significant changes include: Revised Friction Coefficients (
A typical calculation output includes: