| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Outline of Final Research Achievements |
In order to clarify the effective stress intensity factor range and the mechanism of the Mode II fatigue crack propagation, the Mode II fatigue crack propagation problem which causes rolling contact fatigue failure problem was studied. Development of the test method which can reproduce the Mode II type fatigue crack propagation with high flexibility which has compatibility of the jig with a CT specimen was succeeded. For phenomenon explanation, a modeling for obtaining the effective stress intensity factor range in consideration of friction and convexo-concave of the fracture surface was performed, and the effective stress intensity factor range by the developed test method was obtained. Then, in order to examine the material which has been received severe plastic deformation in real rolling contact fatigued machine and to realize the direct observation of the Mode II type fatigue crack propagation, a new test method was developed.
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