The VDI2230 is a guide issued by the German Society of Engineers and is used primarily to calculate the safety of checking high-strength bolted connections. This method has been used in engineering practice for more than 25 years and is widely recognized and cited.
VDI2230 consists of two parts: the calculation method of a single high-strength bolt, the multi-bolt connection theory and the simulation analysis method.
VDI2230 has a variety of calculation process flow. Scene 1: No measured data, no simulation conditions.
A. To design a new bolt connection, perform the R00-R13 steps in Figure 1 .
B. Check the ready-made design and perform the R0-R13 steps in Figure 2 .
Scenario 2: Measured data such as friction data and torque axial force (these data are generally available through the “Equipment for Bolt Fastening Testâ€).
Note: The design check process is only discussed for the situation A in scenario 1, and the same is true for case B.
Scene 3: The measured data with scene 2 + FEA simulation data.
After the verification method is mastered, how to check after the check?
1. Determining the assembly stress When maximizing the bolt strength, special attention should be paid to whether the bolt will yield or break during the assembly process!
2. Determine the working stress It should be ensured that the bolt will not yield or break during the working process!
3. Determining the alternating stress The alternating stress is the root cause of fatigue damage or crack propagation, and bolts are no exception! The accident caused by the fatigue fracture of the bolt is shocking and we must pay attention to it.
4. Determining the surface pressure The surface pressure causes the creep associated with the reduction of the pre-tightening force. If the clamp is crushed (plastic deformation), the reduction of the pre-tightening force is liable to cause non-rotational looseness.
5. Determine the minimum threaded joint length In order to prevent the bolted joint from failing due to the snapping of the engaging thread, a sufficient meshing length should be ensured between the bolt thread and the 'hand piece'.
6. Prevent slippage and determine shear stress For transverse alternating loads, the threaded connection must have sufficient anti-slip capability, otherwise it will cause loose rotation and cause fretting wear and fatigue.
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