www.dtbtest.com/PDFs/steering-system-hydraulic-cylinder-failure.pdf
Description : Failure in automotive steering system hydraulic cylinder
Problem : Piston failures in reduced section transition radius
Analysis : Superimposed stress concentrations due to transition radius and machining marks resulted in circumferential fatigue crack initiation. Was followed by brittle crack propagation due to notch effects.
Resolution & Recommendations :
Modify microstructure from norm. to Q&T and shot peen transition radius to eliminate fatigue crack initiation
