19-10-2021, 09:19 AM
(This post was last modified: 19-10-2021, 09:22 AM by Bob Culver.)
In front stub axles cracks advance vertically from below and/or above until just a thin horizontal slice remains.. With rotation tend to advance less directly leading to the final more circular core.
Of two trailers I have been associated with both had/have axle cracks! And two left front hubs in the Seven. I have a collection of failed railway fishplate bolts I used to pick up walking alongside the tracks locally. Very many bolts were missing! Walked past a parked 4 wheel trailer recently with one wheel missing. The stub had failed mainly from the top down.
Shot peening, rolling etc can greatly increase resistance to fatigue. The old counter was polishing but it was discovered that the mechanical working of the surface had the effect and not the shine. Some reckon the original Austin axles were case hardened, which also provides protection.
The first photo seems to have two opposite origin points.
Of two trailers I have been associated with both had/have axle cracks! And two left front hubs in the Seven. I have a collection of failed railway fishplate bolts I used to pick up walking alongside the tracks locally. Very many bolts were missing! Walked past a parked 4 wheel trailer recently with one wheel missing. The stub had failed mainly from the top down.
Shot peening, rolling etc can greatly increase resistance to fatigue. The old counter was polishing but it was discovered that the mechanical working of the surface had the effect and not the shine. Some reckon the original Austin axles were case hardened, which also provides protection.
The first photo seems to have two opposite origin points.