VDI 2230 (007): The Six Strength Checks R7–R13
🧮 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): ...