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Deformation Analysis of Elliptical Cross-Section Spiral Equal-Channel Extrusion Technique
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Deformation Analysis of Elliptical Cross-Section Spiral Equal-Channel Extrusion Technique
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Aeronautical Science Foundation of China (2011ZE53059); Graduate Starting Seed Fund of Northwestern Polytechnical University (Z2011006)

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    摘要:

    采用簡(jiǎn)化的切片平面應(yīng)變假設(shè)，利用增量疊加法對(duì)橢圓截面螺旋等通道擠壓（ECSEE）過(guò)程的應(yīng)變累積進(jìn)行了分析計(jì)算。通過(guò)對(duì)橫截面上某一質(zhì)點(diǎn)進(jìn)行追蹤，將ECSEE變形過(guò)程分解為兩種基本變形方式：圓-橢圓/橢圓-圓截面過(guò)渡變形和橢圓截面扭轉(zhuǎn)過(guò)渡變形，然后利用MATLAB軟件編程求解，得到了組合后材料內(nèi)部追蹤點(diǎn)的累積等效應(yīng)變沿模具通道長(zhǎng)度的變化規(guī)律和橫截面上等效應(yīng)變累積的分布規(guī)律，并與Deform-3D有限元軟件模擬結(jié)果進(jìn)行了對(duì)比。結(jié)果表明：ECSEE扭轉(zhuǎn)變形所得累積應(yīng)變要大于其他變形形式累積的應(yīng)變，ECSEE變形方式主要是剪切變形；坯料橫截面的等效應(yīng)變從坯料外圍到中心呈梯度減小趨勢(shì)；有限元模擬結(jié)果也驗(yàn)證了解析解的工程準(zhǔn)確性。

    Abstract:

    The simplified slice-plain-strain method and the incorporating incremental superposition theory were adopted for the cumulative effective strain (CES) of elliptical cross-section spiral equal-channel extrusion (ECSEE) process. The ECSEE deformation was divided into two basic deformation modes: round-ellipse/ellipse-round cross-section transitional channel deformation and elliptical cross-section torsion transitional channel deformation, through tracking a particle of the cross section. The change laws for the combined CES of the particle with the channel length and the combined effective strain (ES) distribution were obtained by MATLAB software programming, and the results were compared with these via Deform-3D finite element method (FEM). The results show that the ECSEE accumulation torsion strain is greater than that of other forms, and the shear deformation is dominant. The blank cross-section ES presents the gradient decreasing trend from the periphery to the center. The FEM results also verify the accuracy of analytical solution.

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汪程鵬,李付國(guó),陸紅亞,袁戰(zhàn)偉,陳 波,喬慧娟. Deformation Analysis of Elliptical Cross-Section Spiral Equal-Channel Extrusion Technique[J].稀有金屬材料與工程,2013,42(4):679~683.[Wang Chengpeng, Li Fuguo, Lu Hongya, Yuan Zhanwei, Chen Bo, Qiao Huijuan. Deformation Analysis of Elliptical Cross-Section Spiral Equal-Channel Extrusion Technique[J]. Rare Metal Materials and Engineering,2013,42(4):679~683.]
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  • 收稿日期:2012-04-26
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