著者

竹内 彩陽 金子 堅司 榎本 和城

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集 : JSME annual meeting

巻号頁・発行日

vol.2008, no.6, pp.263-264, 2008-08-02

---

In this study, effects of viscosity and aging on plastic behavior of A7475 aluminum alloy under biaxial loading and in stress relaxation at several temperatures, are investigated experimentally, and are analyzed theoretically based on the Two-Factors constitutive concept, which means the overstress concept including aging effect. As much as temperature become higher, viscosity stress increases, on the other hand, aging stress decreases. Both viscosity and aging in axial loading are larger than those in torsional loading. The model based on Two-Factors constitutive concept gives systematic predictions on both plastic flow behavior and relaxation behavior for each loading direction.

著者

金子 堅司 荒井 正行

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.84, no.863, pp.18-00147, 2018 (Released:2018-07-25)

参考文献数

16

---

We have established the torsion pin test method with tension to evaluate shearing delamination strength of thermal sprayed coating under tension-torsion combined stresses, recently. Apparent delamination strength depends on the diameter of the pin, so the stress distributions around the interface edge between the top-coat and the bond-coat have to be analyzed by using the finite element analysis based on the experimental results to see the real delamination strength. Before analyzing, the deformation properties of the thermal sprayed coating have to be known. In this report, macroscopic elastic deformation properties of the four kinds of porous thermal barrier coating (TBC) is investigated experimentally and analytically. First, the indentation tests are performed to obtain the loading and unloading-depth curves in various load levels, and secondarily Young's moduli are explored by using the unloading-depth curves, Hertz-contact theory and FEM analysis at several loading levels. It becomes clear that the obtained Young's moduli increase with increasing indentation load, which means that the obtained Young's modulus is an apparent modulus of the coating having some structural failure caused by indentation test. As the results, the real Young's moduli are determined at the very small load level with no structural failure for the four kinds of porous thermal barrier coatings.

著者

金子 堅司

出版者

公益社団法人 日本工学教育協会

雑誌

工学教育 (ISSN:13412167)

巻号頁・発行日

vol.59, no.5, pp.5_75-5_76, 2011 (Released:2011-10-06)