Official Answer
Answer
Ring dishing is a conical deformation where the ID and OD are no longer in the same plane. This happens when the axial load $P$ is applied at a radius different from the groove support radius, creating a bending moment $M$. If the ring is too thin, the moment of inertia $I$ is insufficient to resist this bending. In failure analysis, a dished ring will show wear only on its ID on one side and OD on the other. To correct this, the engineer should either: 1) Increase ring thickness $t$; 2) Decrease the clearance between the retained part and the housing; or 3) Use a 'Heavy Duty' series ring with a larger radial wall $b$.
