flyingriki
Well Known Member
A neighbor is rebuilding his Continental. The rod caps came back from the shop with some minor grinding for balancing. They look to have been shot peened originally.
Question: Does the grinding create a need for re-peeing those areas to relieve them of the possibility of cracking?
It seems like a good question since the freshly exposed metal will have different properties than the untouched metal according to this definition:
"Peening a surface spreads it plastically, causing changes in the mechanical properties of the surface. Shot peening is often called for in aircraft repairs to relieve tensile stresses built up in the grinding process and replace them with beneficial compressive stresses. Depending on the part geometry, part material, shot material, shot quality, shot intensity, shot coverage, shot peening can increase fatigue life from 0?1000%."
Question: Does the grinding create a need for re-peeing those areas to relieve them of the possibility of cracking?
It seems like a good question since the freshly exposed metal will have different properties than the untouched metal according to this definition:
"Peening a surface spreads it plastically, causing changes in the mechanical properties of the surface. Shot peening is often called for in aircraft repairs to relieve tensile stresses built up in the grinding process and replace them with beneficial compressive stresses. Depending on the part geometry, part material, shot material, shot quality, shot intensity, shot coverage, shot peening can increase fatigue life from 0?1000%."