Fatigue cracking of bearing and failure of railway axles - Integrity of ...

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Fatigue pre-cracking pre cracking by four bending • Maximum force of four bending fatigue: 2 2 2,52×B×(W-a) 2,52×10×(10-4) P = ×R = ×1100=15023,5N f p 3×(S -S ) 3×(52,5-14,15) 1 2 F =0,1×F =0,1×9014=901,4N min max F =0,6×P =0,6×15023=9014N max f F F
Fracture mechanics toughness testing • Three point bending: F Fatigue crack after test! No stable crack extension!
Page 1 and 2: N. Gubeljak 1 , U. Očko 2 , J. Pre
Page 3 and 4: Motivation Case 1: The wagon’s be
Page 5 and 6: MOTIVATION Case 2 (a few months lat
Page 7 and 8: Motivation Pitting of inner ring of
Page 9 and 10: Motivation Wheel-pair bearing of th
Page 11 and 12: Pleminar Investigation On the wago
Page 13 and 14: Tensile tests
Page 15: Fracture mechanics toughness testin
Page 19 and 20: Fracture mechanics toughness testin
Page 21 and 22: Stress distribution through the sec
Page 23 and 24: Stress distribution through the sec
Page 25 and 26: K I (N/mm 1,5 ) 120 118 116 114 112
Page 27 and 28: F Analysis of results Razpoka na no
Page 29 and 30: Application of Fracture mechanics M
Page 31 and 32: Maksimum value of SIF K IIAmax at p
Page 33 and 34: K = π×a×(σ ×f +σ ×f +σ ×f
Page 35 and 36: Limit load: σ σ gζ ( ) ⋅ + g(
Page 37 and 38: Structure assessment of inner ring
Page 43 and 44: 1 Press stress has not effect to cr
Page 45 and 46: Conclusion The purpose of the work
Page 47: Thank you for your attention!

Fatigue cracking of bearing and failure of railway axles - Integrity of ...

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