|Budget Amount *help
¥24,960,000 (Direct Cost: ¥19,200,000、Indirect Cost: ¥5,760,000)
Fiscal Year 2016: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2015: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2014: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2013: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
|Outline of Final Research Achievements
In the metals with self-tunable elastic modulus developed by our group, the elastic modulus and strength are increased by deformation-induced phase transformation. Using this function, we have started to try a development of stress-responsive self-strengthened metallic implants. Spinal fixation devices seem to be one of the applications for such the metals, and thus their responses to bending deformations were investigated in this study. As the results, the deformation-induced ω phase was observed in both the compression and tension sides of the bended rods. The metals with self-tunable elastic modulus exhibited high fatigue strengths under tension-tension modes so that high durability could be obtained by suitable surface strengthening treatments for suppressing fretting fatigue at the contacts between the components in spinal fixation devices during cyclic bending deformations.