Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53682#.VM80qizQrzE Author(s)     Byung-Chan Kim 1 , Jung-Won Lee 1 , Seok-Jae Ha 1 , Yong-Kyu Cho 1 , Dong-Sung Kang 2 , Myeong-Woo Cho 1 Affiliation(s) 1 Department of Mechanical Engineering, Inha University, Incheon, Republic of Korea . 2 WISYS, Gunpo-si, Republic of Korea . ABSTRACT Nitinol is used in various industries, especially for biomaterials. Generally, the surface integrity of sub-micron level and non-surface flaw is required in nitinol for biomaterial. However, surface flaws, such as scratches, pits, and residual stress, can occur on the polished surface, and it is difficult to remove these surface flaws. The corrosion is accelerated continuously and causes bad influence in the body. Therefore, in this study, conventional polishing and MR polishing were used to minimize the corrosion and residual stress when the nitinol is used as biomaterial. X-...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53258#.VLh-DMnQrzE Author(s)   Osamu Takakuwa * , Hitoshi Soyama Affiliation(s) Department of Nanomechanics, Graduate School of Engineering, Tohoku University, Sendai, Japan . ABSTRACT In this paper we demonstrate that the residual stress introduced by several different surface finishes affects the critical current density for passivation and the passive current density in the anodic polarization curve of austenitic stainless steel and that those critical current densities can be reduced by controlling the residual stress by applying a cavitating jet to the backs of specimens. The results show that the current density either ...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=50944#.VFCEzlfHRK0 Author(s)   Z. Pędzich 1* , G. Grabowski 1 , I. Saferna 1 , M. Ziąbka 1 , A. Gubernat 1 , J. Szczerba 1 , M. M. Bućko 1 , M. Kot 2 Affiliation(s) 1 Department of Ceramics and Refractory Materials, AGH-University of Science and Technology, Krakow, Poland . 2 Department of Machine Design and Technology, AGH-University of Science and Technology, Krakow, Poland . ABSTRACT Silicon carbide and silicon nitride are recognized as phases with very good mechanical properties. Many parts of machines and mechanical devices are made of these materials. Particulate composites basing on both mentioned phases have signifi...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=48513#.VDtLAlfHRK0 Author(s)   Mikihito Hirohata , Yoshito Itoh Affiliation(s) Graduate School of Engineering, Nagoya University, Nagoya, Japan . Graduate School of Engineering, Nagoya University, Nagoya, Japan . ABSTRACT In order to propose high effective simulation using finite element method (FEM) for predicting deformation and residual stress generated by one pass butt welding, a series of numerical analyses were carried out. By idealizing the movement of heat source (the instantaneous heat input method), the tendency of welding out-of-plane deformation and the residual stress distribution could be predicted. The computing time was around 9% of that by the pr...