Heavy rail / Urban light rail

Fatigue Behaviour Characterization

Perform sizing of new parts and characterize fatigue behaviour of mechanical parts and materials and establish potential.

Tests objectives

  • Assess fatigue behaviour of:
    – Small equipment (bearing cages, shock absorbers, brake beams, suspension parts, etc.)
    – Bolted, welded and riveted assemblies
  • Determine the laws of crack formation
  • Determine the critical plane stress intensity factor (K1C)
  • Assess the fatigue limits of metal and composite materials and establish Wöhler curves and endurance diagrams for materials and assemblies

Tests facilities

  • 6 servo-hydraulic machines for tension and compression testing (from ± 15 kN to ± 160 kN)
  • 1 servo-hydraulic machine for torsion (± 5,000 N.m)
  • 3 bending machines (± 50 kN)
  • Force and displacement sensors on each cylinder
  • Parallel measurements for multiple monitoring: Extensometry, displacement, temperature
  • Non-destructive test instruments

Testing norms

EN 13261+A1 – Wheelsets and bogies – Axles – Product requirements

NF A03-400 – Iron and steel – Fatigue testing – General principles

NF A03-405 – Metal products – Fatigue testing – Statistical data processing

Caractérisation en fatigue

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Our references

ALSTOM
BEA-TT (French Land Transport Accident Investigation Bureau)
SNCF