It is determined while taking into account the tightening and adjusting techniques and if need be the coefficient of friction classes (Table A5) according to Table A8.”. Alpha-A factor, quote from VDI 2230: “The tightening factor Alpha-A takes into account the scatter of the achievable assembly preload between FMmin and FMmax. Hydraulic tensioning will also be considered in Table A8, which includes the tightening factors Alpha-A for all major bolting methods. Titelmasterformat durch Klicken bearbeiten CADFEM 20 Part 1 ANSYS Conference & 10. April 2015, Wien 2 Introduction VDI 2230 Bolt Assessment inside ANSYS Verification Examples Application Example Conclusion 3. Thererfore the guideline separates between bolt preload F VM (initial assembly preload, generated by bolt tensioning cylinder and a run-down nut) and assembly preload F M (residual assembly preload after releasing the pressure). CADFEM 2015 Agenda ANSYS Conference & 10. The new and extra chapter 5 deals with ' hydraulic, friction- and torsion-free tensioning' with bolt tensioning cylinders. For the first time the VDI 2230 will clearly separate between 'turning' (torquing) and 'pulling' (tensioning) bolting methods.
The system and process design of FEM calculation in general where updated as well, which are defined in VDI 2230 part 2.
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