Bearing Pressure

🧮 在线计算器：VDI 2230 Bolted Joint Calculation — The full 14-step calculation chain (R0–R13), with six strength checks. Six strength checks and the tightening torque: R7–R13 R1–R6 answered “how much preload to apply”; R7–R13 answer “can the bolt take it”. 1. R7 — assembly stress check (§5.5.1) This is the first gate: the bolt does not exceed yield strength during assembly. The standard allows the use of a fraction of the yield strength (usually $\nu = 0.9$, i.e. 90%); the allowable assembly comparison stress is (VDI 2230:2015, §5.5.1, Eq. R7/1): ...

🧮 在线计算器：Bolt Pre-selection Calculator — Fast sizing with the Kübler equation; supports a design mode and a check mode. Introduction: the rubber-band-and-sponge model To fully understand the physical logic behind the “bearing-pressure check”, we can picture the bolted-joint system as “a stretched rubber band (the bolt) clamping a sponge (the clamped part)”. The heart of this part is to reveal a key question: why, when a part’s surface is crushed just a little bit, does the whole bolted joint face the risk of complete failure? ...