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

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SIF K 1 Application of Fracture mechanics K= I 3 a 2c R i π×a∑σ×f( , , ) i i i=0 t a t a[mm] -crack depth t[mm] -thickness of ring 2c[mm] -crack length of surface Ri [mm] σ[N/mm -inner radius of ring 2 98 96 94 92 90 88 ] -stress through thickness of ring Maximum SIF K IAmax in point A: K = π×a×(σ ×f +σ ×f +σ ×f +σ ×f ) IAmax 0 0 1 1 2 2 3 3 σ,σ,σ,σ obr kr 0 1 2 3 f 0,f 1,f 2,f 3 [N/mm2 ] -aproximation parametrs (σ +σ ) t t -from SINTAP handbook for point A Napetost (N/mm 2 ) 102 100 (σ t obr + σt kr ) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Položaj na obroču (mm)
Application of Fracture mechanics Minimum SIF K IAmin in point A. K = π×a×(σ ×f +σ ×f +σ ×f +σ ×f ) 1Amin 0 0 1 1 2 2 3 3 Napetost (N/mm 2 ) 120 100 80 60 40 20 0 σ t kr 0 2 4 6 8 10 12 14
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 and 16: 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: F Analysis of results Razpoka na no
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!

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