Resilience

🧮 在线计算器：VDI 2230 Bolted Joint Calculation — The full 14-step calculation chain (R0–R13), with six strength checks. Eccentric load and bending-moment effect — the “deep water” of VDI 2230 All the earlier worked examples assumed concentric symmetry ($s_{sym} = 0$, $a = 0$). But the standard states clearly: concentric symmetry is the minority case in engineering practice. 1. Why is eccentricity the norm? The standard says (VDI 2230:2015, §5.1.2.3, p.57): ...

🧮 在线计算器：VDI 2230 Bolted Joint Calculation — The full 14-step calculation chain (R0–R13), with six strength checks. Clamped-parts resilience δP and the Rötscher cone model The previous article settled how “soft” the bolt is ($\delta_S$); this one answers how “soft” the clamped parts are ($\delta_P$) — the other half of the force ratio $\Phi$ calculation. 1. Why is δP harder to compute than δS? The bolt resilience $\delta_S$ can be broken simply into series cylindrical segments that add up. But the clamped parts are a completely different case — the standard states (VDI 2230:2015, §5.1.2, p.45): ...

🧮 在线计算器：VDI 2230 Bolted Joint Calculation — The full 14-step calculation chain (R0–R13), with six strength checks. Bolt elastic resilience δS — breaking the bolt into a chain of cylinders The previous article set up the framework of the spring model; this article provides the first concrete number for the numerator and denominator of the force ratio $\Phi$ — how “soft” is the bolt itself? 1. Basic principle: series cylindrical segments VDI 2230 treats the bolt as a tension spring made of several series cylindrical segments of different cross-sections (VDI 2230:2015, §5.1.1, Bild 6). ...

🧮 在线计算器：VDI 2230 Bolted Joint Calculation — The full 14-step calculation chain (R0–R13), with six strength checks. The “spring philosophy” of a bolted joint — the core physical model of VDI 2230 1. The spring model: the physical basis of VDI 2230 The starting point of all VDI 2230 calculations is to model the bolted joint as two sets of springs (VDI 2230:2015, §3.2, p.20): “In this model, the bolt and the clamped parts are considered as tension and compression springs with the elastic resiliences $\delta_S$ and $\delta_P$.” ...