Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
飯野 雄基*; 秋田 貢一*; 佐野 雄二*; 水田 好雄*; 玉置 悟司*; 菖蒲 敬久
no journal, ,
Currently, aging society is progressing worldwide, and then it is important to expand healthy life expectancy. From the research results of heathy life, oral health has been found to be affected healthy life expectancy. Therefore, dental implant treatments have become widely used. However, fracture of the implant components has been reported. This study attempted to solve this problem by Low Energy Laser Peening (LELP). It uses lower energy than that of current Laser Peening (CLP). For example, the energy in CLP is 200 mJ while it is 1.5 mJ in LELP. A previous study reported that CLP couldn't improve the fatigue strength of a miniature size specimen of Ti-6Al-4V for implant components because the introduced compressive residual stress layer was too large and therefore balancing tensile residual stress became relatively high. In contrast, LELP introduces relatively thinner compressive stress layer and small balancing tension. Therefore, LELP is thought suitable for enhancing fatigue strength of miniature size samples. This study focuses on the fatigue strength enhancement of Ti-6Al-4V by LELP. Biocompatibility of the LELP treated surface is also examined. Results will be presented at the conference.
千代 隼久*; 秋田 貢一*; 佐野 雄二*; 水田 好雄*; 玉置 悟司*; 菖蒲 敬久
no journal, ,
本研究では、極表層に残留応力を付与できる低エネルギーのレーザーピーニング4)(Low-energy laser peening: LLP)を電磁鋼板の打抜き加工面に適用し、残留応力の改善とそれによる疲労強度向上を試みた。実験は実験室系X線及び放射光X線を利用した、表面から内部に至るひずみ分布計測を行った。その結果、打抜きによって発生した高い引張残留応力がLLP施工によって圧縮残留応力に転換されること、LLP施工の圧縮残留応力生成によってバランスする引張残留応力は非常に小さいこと、そして、LLP施工時に発生する腐食を抑えたWEDM試験片において疲労強度が大幅に改善されることを明らかにした。