Official Answer
Answer
When the housing material (e.g., Magnesium or Plastic) has a lower yield strength than the ring, the assembly's capacity is governed by the 'Groove Yield'. The allowable thrust load $P_a = \frac{D d π σ_y}{S}$, where $\sigma_y$ is the yield strength of the housing material. If the calculated $P_a$ is less than the required design load, simply increasing the ring's strength will not help. Instead, the designer must increase the 'Groove Depth' $d$ or the 'Groove Diameter' $D$. Another advanced technique is to use a 'Load-Spreading Washer' between the ring and the housing to distribute the axial force over a larger area, effectively reducing the localized stress on the groove wall and preventing the 'dishing' failure mode.
