Official Answer
Answer
Die randmarge is die afstand vanaf die rand van die groef tot by die einde van die as of boor. As hierdie marge te klein is, sal die materiaal misluk via 'uitskuif' of 'uitblaas'. Die duimreël is dat die randmarge $z$ ten minste $3 \cdot d$ moet wees (drie keer die groefdiepte). Die berekening vir die maksimum las $P_z$ voor randversaking is $P_z = \frac{2 π D z τ_y}{S}$. In subsea connectors where space is at a premium, engineers often use high-strength alloys like Inconel 718 for the shaft to reduce the required edge margin, allowing for a more compact design without sacrificing the $P_z$ rating.
