著者
アギアル デ ソウザ ヴィニシウス 渡邊 育夢 柳田 明
出版者
一般社団法人 日本機械学会
雑誌
M&M材料力学カンファレンス
巻号頁・発行日
vol.2013, pp._OS0805-1_-_OS0805-3_, 2013

The purpose of this study is to improve and extend a method to estimate the friction coefficient in equal channel angular extrusion (ECAE) including cases with back pressure. Employing three dimensional finite element analysis (FEA) and Coulomb friction model with truncated shear stress, the relationship between the friction coefficient and the reaction force is investigated in ECAE with back pressure. Additionally, the deformation state of the billet after ECAE and the pressing load are compared between the experiment and the simulation results with the same friction coefficient for validation of the numerical model.
著者
アギアル デ ソウザ ヴィニシウス 桑水流 理 何 惠安 戸田 裕之 小林 正和
出版者
一般社団法人 日本機械学会
雑誌
M&M材料力学カンファレンス
巻号頁・発行日
vol.2013, pp._OS0311-1_-_OS0311-3_, 2013

The objective of this study is to evaluate the stress/strain distribution on a cast aluminum alloy (AC4CH-T6) employing image based nonlinear elasto-plastic finite element analysis. The numerical analysis was performed to simulate a uni-axial tension test. The geometry of the finite element model includes an aluminum matrix, silicon and inter-metallic particles which were obtained by the synchrotron X-ray micro-computed tomography (XMCT) technique. In order to create a proper finite element mesh, the Standard Triangle Language (STL) generated from the XMCT segmented volume was treated to remove geometric and structural irregularities. Results are discussed in terms of the number of elements necessary to accurately represent the stress/strain fields and the necessary computational time to simulate the problem. Additionally, results enabled visualizing the stress/strain distributions, stress concentration, and the stress/strain evolution on the three solids of interest.