JOURNAL OF THE JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY vol.50 no.580 May 2009 ---CONTENTS--- Essay How We Compete Yoshihiro YAMAGUCHI 1(379) Explanations Structural Design of Spiral-Towers 　―Examination of Structural Design from Early Stage of Planning Onward― Takao NISHIZAWA 3(381) An Overview of Meshless Simulations and Their Applications to Plastic Forming Analysis Yuzuru SAKAI 8(386) Lectures Determination of Forming Limit Diagram and Its International Standardization Hisashi HAYASHI 14(392) Papers Analysis of Energy for Sheet Metal V-Bending and Derivation of Formula for Estimating Energy 　―Processing Energy of Sheet Metal Bending― Hideo OGAWA and Takuji HANAYA 21(399) Fabricating Complex Cups by Hot Pressing from Wood Powders Ryohei KURAMATSU, Takashi IIZUKA, Nobuo HATANAKA, Norio TAKAKURA and Kouzou KANAYAMA 26(404) Experimental and Analytical Evaluation for Torsional Vibration of Hot Rolling Mill with Twin-Type Drive System 　―Torsional Vibration of Twin-Type Drive System for Hot Rolling Mill �U― Naoyuki NAGAI, Hideaki FURUMOTO, Kanji HAYASHI, Takashi ISHIDA, Katsuhiko FUKUMA and Noritoshi NAKAGAWA 31(409) Effect of Quality of Sheared Edge on Formability of Hole Expansion of Ultra High Strength Steel Sheets Yohei ABE, Ken-ichiro MORI and Yoshio SUZUI 36(414) FEM Simulation of Incremental Burring Process Using a Bar Tool 　―Study of Incremental Burring for Large Branched Pipe (2)― Toshiya TERAMAE, Ken-ichi MANABE, Keii UENO, Kei-ichi NAKAMURA and Hiroshi TAKEDA 41(419) Hot Gas Bulging of Aluminum Alloy Tube by Resistance Heating in Forming Machine Tomoyoshi MAENO, Ken-ichiro MORI and Kouji FUJIMOTO 46(424) Effect of Shape Ratio of Billet on Load in Forward Rod-Backward Can Combined Extrusion Forging 　―Research on Cold Forward-Backward Combined Extrusion Forging of Aluminum Alloy �U― Eisuke MURAI, Munenori ONO, Yasuhisa TOZAWA, Yukihiko SAWAI, Takahiro KOJIMA and Shin-ichi HAMAYA 51(429) Development of Micro-Dimple Forming for Inner Surface of Pipe Masaru FUTAMURA, Kuniaki DOHDA, Takehiko MAKINO and Tetsuya SUZUKI 56(434) Copyright (C)1997-2009 JSTP. All Rights Reserved.