Fatigue cracking of bearing and failure of railway axles - Integrity of ...
Fatigue cracking of bearing and failure of railway axles - Integrity of ...
Fatigue cracking of bearing and failure of railway axles - Integrity of ...
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Fracture mechanics toughness testing<br />
• SIF calculation<br />
⎛ P×S ⎞ ⎛ 1764,1×52,5 ⎞<br />
K = ⎜ ⎟×f(a/W)= ⎜ ⎟×2,0043=587N/mm<br />
⎝ ⎠<br />
mat<br />
Q<br />
1/2 3/2<br />
⎝(B×B ) ×W N ⎠<br />
1/2 3/2<br />
(10×10) ×10<br />
[ ]<br />
1/2 2<br />
3×(a/W) × 1,99-(a/W)×(1-(a/W)×(2,15-3,93×(a/W)+2,7×(a/W) )<br />
a /W)= =<br />
i 3/2<br />
2×(1+2×a/W)×(1-a/W)<br />
[ ]<br />
1/2 2<br />
3×(4/10) × 1,99-(4/10)×(1-(4/10)×(2,15-3,93×(4/10)+2,7×(4/10) )<br />
a /W)= =2,00438<br />
i 3/2<br />
2×(1+2×4/10)×(1-4/10)<br />
a [mm] -crack length<br />
P Q [N] -Force <strong>of</strong> <strong>failure</strong><br />
S [N] -span distance<br />
B [mm] -thickness <strong>of</strong> specimen<br />
W [mm] -width <strong>of</strong> specimen<br />
3/2