). This depends heavily on whether the joint is eccentric or concentric. Step 7: Account for Embedding and Relaxation ( FZcap F sub cap Z
The standard provides exact analytical formulas to calculate the spring stiffness of both the bolt and the clamped parts. Because the compression zone inside the clamped plates forms a complex "clamping cone" or "clamping cylinder," VDI 2230 utilizes specific substitution geometric models to estimate δPdelta sub cap P accurately. 3. Load Factor and Force Distributions The external axial load ( FAcap F sub cap A ) is split using the load factor ( ΦKcap phi sub cap K
Comprehensive Guide to VDI 2230 Part 1: Systematic Calculation of Highly Stressed Bolted Joints
High-strength fasteners (typically property classes 8.8 to 12.9). vdi 2230 part 1 pdf
The is the world’s leading standard for the systematic calculation of high-strength bolted joints. It provides a detailed, step-by-step procedure to ensure that a bolted connection can safely withstand its intended loads without failing or loosening.
It focuses on (single-bolted connections) subjected to axial loads and transverse forces. The goal is to determine the correct bolt size and tightening torque to maintain a sufficient "clamping force" under all operating conditions. 2. The 13-Step Calculation Procedure
The bolt experiences both tensile stress (from preload) and torsional stress (from thread friction during torqueing). VDI 2230 requires checking that the combined Von Mises stress ( σredsigma sub r e d end-sub ) does not exceed 90% of the bolt's yield strength ( Rp0.2cap R sub p 0.2 end-sub Step 8: Check the Bolt Stress Under Working Load Because the compression zone inside the clamped plates
) and any bending stress. This must still remain safely below the yield strength of the bolt material. Step 9: Evaluate Fatigue Stress (For Dynamic Loads)
VDI 2230 Part 1 is an internationally recognized standard for the calculation of . It is a national and international recognized standard to calculate highly stressed bolted joints. It is applied not only in Germany and Europe but also in the United States and China. The standard applies to bolted joints that must transmit constant or alternating working loads and are designed with high-strength bolts (strength grades 8.8 to 12.9, or 70 and 80). It is intended for joints where failure could cause serious damage. The calculations are based on the assumption that the strained cross-sections remain plane.
Use a scientifically proven method recognized worldwide. Key Sections in the 2015-11 Revision The is the world’s leading standard for the
Summary
Fatigue strength requirements for joints subject to vibration or cycling.
Identify how the external load enters the joint. Is it concentric (aligned with the bolt axis) or eccentric (causing a bending moment)? Determine the distance of the load application point. Step 3: Select Bolt Geometry and Tightening Factor ( αAalpha sub cap A
(clamping length, hole diameters, and plate thicknesses).
Published by the Association of German Engineers ( Verein Deutscher Ingenieure ), VDI 2230 Part 1 is a structural calculation standard titled The guideline applies specifically to: Cylindrical bolted joints.
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