The core of VDI 2230 Part 1 is its 14-step (R0 to R13) procedure, which guides the engineer through a methodical design and verification process. These steps are logically grouped into three main phases: Input, Determination, and Verification.
For joints subjected to dynamic or cyclic loading, calculate the stress amplitude acting on the bolt thread. Compare this to the permissible fatigue limit of the thread to ensure the bolt will not fail prematurely due to fatigue. Step 13: Verification of Surface Pressure ( pmaxp sub m a x end-sub
The calculation of elastic resiliences of the connecting elements — bolt δS and clamped parts δP — constitutes the theoretical core of the VDI 2230 calculation. An estimation of the load introduction factor n is also required, which accounts for the position where the working load is introduced into the joint. The load factor φ is then calculated as: vdi 2230 2021
Calculate the lowest allowable preload during assembly. It must be high enough that even after losses from embedding ( Fzcap F sub z ) and variations due to the tightening factor ( αAalpha sub cap A ), the remaining clamping force exceeds FKmincap F sub cap K space m i n end-sub Step 9: Determination of the Maximum Assembly Preload ( FMmaxcap F sub cap M space m a x end-sub Calculate the upper limit of the assembly preload:
The (Blatt 1) guideline is the standard for the systematic calculation of highly stressed bolted joints, serving as a critical update to the 2015 edition. It provides a comprehensive 13-step methodology to ensure that bolted connections can withstand complex static and dynamic loads without failure. Core Significance of the 2021 Update The core of VDI 2230 Part 1 is
The 2021 release enhances calculation accuracy and reliability for modern engineering challenges. Key features of the current guideline include:
Under working loads, additional forces in the bolt (from axial loads, bending moments, thermal expansion, etc.) increase the resulting stresses. This step verifies that the maximum stress occurring under static operating conditions remains below permissible values, for example, 640 N/mm² for strength class 8.8 bolts. Compare this to the permissible fatigue limit of
) is applied to an already tightened joint, the bolt stretches a bit more, while the compressed parts relax a bit. The external load is divided between the bolt and the components based on their stiffness: The portion of the external load carried by the bolt. Clamping Force Reduction ( ΔFMcap delta cap F sub cap M
Calculate the maximum combined stress on the bolt during operation (maximum preload + operational bolt force increment + operating bending moments). Ensure it remains safely below the yield strength. Step 9: Verify alternating stress ( σasigma sub a
