Fretting Issues On Conrod Bearings

Failed bearings and fretting phenomena on conrod

Stress and fatigue analysis

LocationLouisiana USA
ApplicationPoly-Ethylene production
Compressor TypeClark Reciprocating Compressor
ServiceEthylene make up
Power 3 MW
Disch. Pressure2000 bara

Challenge

  • Fretting phenomena on the back side of connecting rod bearings and conrod body
  • Big end cast aluminum bearing failure

Solution

  • RCA to assess the cause of the failure and confirm the fretting phenomena by FEM simulations
  • Big end bearing, studs and body reverse engineering and redesign to optimize contact pressure and avoid relative movement between bearing and big end