Fatigue strength of axle springs

Relevant influences

• Mechanical loading as a result of 
  • Spring compression
  • Axle kinematics
• Corrosive environmental conditions
• Damage to surface and coating caused by
  • Spring seat abrasion
  • Stone impact

Experimental verification

• Pre-damage caused by stone impact
• Corrosion in alternating cycle tests developed by the German Association of the Automotive Industry (Verband der Automobilindustrie, VDA)
• Optional tests with simulated compression kinematics
• Tests with original spring seats in installation position
• Vibration fatigue tests with fixed or variable amplitudes
• Abrasive wear simulation
• Corrosion simulation with intermittent salt-water spray exposure
• Statistical validation with systematic testing and a sufficient number of test items