Engineers must define the geometry, material properties, and operational loads acting on the joint. This includes identifying whether the joint is concentric or eccentric. 2. Determining the Tightening Factor ( αAalpha sub cap A
) is applied to the joint, VDI 2230 determines exactly how much of that load increases the tension in the bolt (
). This determines how the external working load partitions into an additional bolt load ( FSAcap F sub cap S cap A end-sub ) and a compression reduction load ( FPAcap F sub cap P cap A end-sub Step 5: Calculate Assembly Preload Limits Determine the maximum and minimum assembly preloads ( FM,maxcap F sub cap M comma m a x end-sub FM,mincap F sub cap M comma m i n end-sub ) while accounting for the tightening factor ( αAalpha sub cap A vdi 2230 part 1 pdf
The document is organized into a specific sequence of calculation steps (often referred to as R1 through R13) to determine the functional reliability of a joint: Chapter 14 Bolted Joints according to VDI 2230
Because VDI 2230 is a proprietary technical standard, official PDF copies are typically not available for free. You can find the authorized version through these primary distributors: VDI Official Website: is the primary source for the most recent revisions. DIN Media (formerly Beuth): As the central organ for German standards, offers the PDF in both German and English. Technical Libraries: Engineers must define the geometry, material properties, and
The PDF includes extensive data on engineering materials, detailing young's moduli, thermal expansion coefficients, and limiting surface pressures ( pGp sub cap G
Summary
Many bolted joints are subjected to fluctuating loads, which can lead to fatigue failure. Step R9 performs a fatigue analysis by calculating the alternating stress amplitude (σa) and comparing it to the bolt's fatigue limit, accounting for the number of load cycles (NZ/ND) and the joint's geometry.
Before diving into the calculation steps, it is essential to understand the core mechanical principles underlying the guideline. 1. The Joint Diagram (The Compliance Model) Determining the Tightening Factor ( αAalpha sub cap
In joints where transverse loads are transmitted by friction, this step checks the safety against slip. It also provides a verification for situations where the design relies on the bolt shank directly bearing against the clamped parts (a pin or fit bolt).