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Elasto-Plasticity Behavior of Type 5000 and 6000 Aluminum Alloy Sheets and Its Constitutive Modeling
Shohei TAMURA,Satoshi SUMIKAWA,Hiroshi HAMASAKI,Takeshi UEMORI,Fusahito YOSHIDA 한국소성가공학회 2010 기타자료 Vol.2010 No.6
To examine the deformation characteristic of type 5000 and 6000 aluminum alloy sheets, uniaxial tension, biaxial stretching and in-plane cyclic tension-compression experiments were performed, and from these, r-values (r?, r45 and r90), yield loci and cyclic stress-strain responses were obtained. For the accurate description of anisotropies of the materials, high-ordered anisotropic yield functions, such as Gotoh’s biquadratic yield function and Barlat’s Yld2000-2d, are necessary. Furthermore, for the simulation of cyclic behavior, an advanced kinematic hardening model, such as Yoshida-Uemori model (Y-U model), should be employed. The effect of the selection of material models on the accuracy of the springback prediction was discussed by performing hat bending FE simulation using several yield functions and two types of hardening laws (the isotropic hardening model and Y-U model)
High-Resolution Optical Measurement of Fiber Optics Transmission Line Length
Takeshi Tsujimura,Koichi Yoshida,Kuniaki Tanaka,Kazunori Katayama,Yuji Azuma,Masahiko Mikawa 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper studies a frame-loss-free shunt system for broadband optical fiber transmission lines. This system switches transmitting optical pulses between duplicated optical fibers to avoid any interruption to communication. A high-resolution measurement technique is necessary to evaluate the optical fiber length. We applied an interferometry technique to adjust 15 km duplicated optical lines at a resolution of 10 mm. An optical line switching system and procedure are designed for use in replacing in-service optical lines. A free space optics (FSO) system adjusts the length of an in-service optical line by up to 100 m. A gigabit ether-passive optical network (GE-PON) line is successfully replaced with an extended line while maintaining transmission.
Collimator Focus Adjustment for Free Space Optics System Using Single-mode Optical Fibers
Koichi Yoshida,Kuniaki Tanaka,Kazunori Katayama,Takeshi Tsujimura,Yuji Azuma 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper presents a method for adjusting a free space optics (FSO) system that links two single-mode optical fibers (SMFs) using collimators. It operates as if the two SMFs were seamlessly connected without the need for any photoelectric devices. Collimator focusing as well as axis alignment is critical for low loss transmission and is performed using an opto-mechatronic system in the proposed method.
Uemori, Takeshi,Okada, Tatsuo,Yoshida, Fusahito 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
This paper presents the prediction of springback in sheet metal forming in terms of the description of the Bauschinger effect. It addresses three different types of constitutive models: an iso-tropic hardening model (IH model), a linearly kinematic hardening model (LK model), and a model of combined linearly-nonlinearly kinematic and isotropic hardening (L-NK+IH model). The springback predicted by the L-NK+IH model is found to be more pronounced than that by the IH and the LK model. It is caused by the stress-strain response characterized by the gradual transition from fully elastic to plastic behavior during stress-reversal, which is essential to the L-NK+IH model.
( Yoshiaki Yoshida ),( Takeshi Endo ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Recently, we have reported that polyaddition of various diisothiocyanates and dithiols is achieved with triethylamine in DMF at 25 °C for 12 h under nitrogen atmosphere to obtain the corresponding polydithiourethanes (PDTU) in higher yield and molecular weight. Particularly, PDTU containing an aliphatic moiety in the main-chain exhibited excellent optical and mechanical properties compared to that of typical polyurethanes. In this study, aliphatic PDTUs were synthesized from various diisothiocyanates and dithiols having a difference of carbon number, and then the chemical and physical properties of the obtained PDTUs such as solvent solubility, glass transition temperature, thermal stability, transparency, refractive index, and tensile strength, were analyzed in detail by GPC, NMR, IR-ATR, UV-vis, DSC, TGA, tensile testing measurements. Moreover, the cast films obtained from multifunctional multifunctional isothiocyanate and thiols exhibited excellent chemical and physical properties.