Fatigue strength of axle springs

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

 

Benefits of IABG spring test benches

  • Energy efficiency by utilising the principle of resonance in tests
  • Reliability and low maintenance
  • Exclusion of exogenic forces and vibrations
  • Testing with parallel and circular deflection
  • Tests with original spring seats in installation position
  • Dry and wet fatigue tests
  • Optional application of abrasive media to spring seat
  • Software-based testing, documentation and evaluation
  • Accepted by all leading car manufacturers 
  • Compliant with German OEM standards (AK-LH07) for springs and stabilizer bars