| Budget Amount *help |
¥12,220,000 (Direct Cost: ¥9,400,000、Indirect Cost: ¥2,820,000)
Fiscal Year 2018: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2016: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
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| Outline of Final Research Achievements |
This study investigated a prediction method of fatigue crack growth behavior generated by cyclic out-of-plane bending stresses and shear stresses. First, the crack fracture surface was obtained in bending fatigue tests for bead-on-plate specimens. Then, finite element analyses were conducted in order to obtain the stress conditions around the crack front. Bending stress, membrane stress and shear stress obtained by the FEA were used for parametric studies with 2D model. Consequently, the crack growth behavior under plate bending can be simulated by simple 2D analysis. Besides, it is demonstrated fatigue crack growth can be drastically reduced by attaching CFRP sheets on the crack surface.
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