| Budget Amount *help |
¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2018: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2017: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
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| Outline of Final Research Achievements |
It is considered that fatigue life can be divided into two separate contributions: the crack initiation life and crack propagation life. The purpose of this research is to propose a methodology for predicting fatigue crack initiation and propagation life of weld joint using an unconventional elasto-plasticity model called the FSS model. The FSS model is based on the Subloading Surface theory, which was enriched by including the elastic boundary and cyclic damage concepts for the description of strain softening behavior within macroscopically elastic stress state. The model was used to investigate the inelastic response of the material under different cyclic loading conditions. In this study, finite element analysis was conducted to assess the fatigue crack initiation life and subsequently propagation life by extending the assessment method for fatigue crack initiation life by considering a cyclic plasticity accumulation during fatigue loading.
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