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Volume 55, Issue 6
Displaying 1-3 of 3 articles from this issue
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RESEARCH REPORT
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Takayuki SAKUMA, Toshiki MURAMATSU, Akira TAJIRI, Soutaro SEKITA2005 Volume 55 Issue 6 Pages 245-251
Published: 2005
Released on J-STAGE: February 24, 2006
JOURNAL FREE ACCESSAnisotropy of mechanical properties in full annealed sheets was studied using pure aluminum with {100}‹001›. Yield stress anisotropy was not observed. However, work hardening behavior, flow stress and several kinds of elongation were different depending on tensile direction. The anisotropic behavior in fracture elongation was well consistent with that in uniform elongation. Namely, the elongation was maximum at a direction of 45° to RD. In contrast, elongation parallel to RD exhibited the minimum value. The anisotropy of the uniform elongation was due to anisotropic behavior of the work hardening. Crystallographic orientation and dislocation structure developed by tensile deformation played an important role in the anisotropy of these properties.View full abstractDownload PDF (1203K) -
Yoshiaki YASUI, Koji HOSOMI, Akira ONITAKE2005 Volume 55 Issue 6 Pages 252-258
Published: 2005
Released on J-STAGE: February 24, 2006
JOURNAL FREE ACCESSRecently, compatibility of crush safety performance and light weight construction are demanded in the impact absorption structural members in various vehicles. In the present paper, energy absorption characteristics of various thin-walled polygonal tubes under dynamic axial load are numerically analyzed by finite element method. In addition to the influences of stiffened ribs on impact strength in square, hexagonal and circular tubes, the energy absorption capacities of hexagonal tubes with rib was investigated under various factors such as cell size, material of members and correlation of thickness of the rib and cell. As the result, it has been clarified adding ribs to the various thin-walled tubes would be effective for improvement of crashworthiness. That is, the existence of reinforced rib stabilizes dynamic collapse behavior and enhances the energy absorbing efficiency as well as the absorbed energy which is considerably improved by choosing appropriate thickness of the rib and cell.View full abstractDownload PDF (1609K) -
Kazuyoshi KATOH, Hiroshi TOKISUE, Takashi KITAHARA2005 Volume 55 Issue 6 Pages 259-264
Published: 2005
Released on J-STAGE: February 24, 2006
JOURNAL FREE ACCESSAZ91 magnesium alloy castings plate with 5 mm thickness was friction stir welded. The microstructures and mechanical properties of FSW joints were investigated. Regardless of the welding conditions, the microstructures of stirred zone showed finer than that of the base metal. Tensile strength of all the joints showed higher value than that of the base metal. The tensile strength and elongation of joints showed as same as base metals. All the tensile tested joints were fractured at the base metal. Regardless of the welding conditions, the impact value of joints showed higher value than that of the base metal, and the maximum impact value of joint was 295% of the base metal. The highest temperature of the friction stir welding process showed 669K, and it decreased with increasing welding speed. The welding force increased with increasing welding speed, and decreased with increasing rotational speed of tool.View full abstractDownload PDF (1305K)
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