2021 - Vdi 2230

The guideline does not eliminate the need for experimental or numerical validation, particularly for highly critical or non-standard joints. It provides an analytical foundation that must be complemented by sound engineering judgment and, when necessary, FEA or physical tests.

The tightening factor α_A describes the scatter in the preload force that results from the chosen assembly method. A lower scatter allows for a higher usable preload, leading to a safer and more efficient joint. For example, a simple impact wrench might have α_A > 1.6, while a precision yield-point-controlled system may have α_A < 1.1. vdi 2230 2021

For dynamically loaded joints, calculate the amplitude of the alternating axial stress. Compare this against the bolt's fatigue limit ( σASGsigma sub cap A cap S cap G end-sub The guideline does not eliminate the need for

: Rough sizing based on estimated loads and surface pressure limits. A lower scatter allows for a higher usable

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