本文選題：冷擠壓 + 殘余應(yīng)力��； 參考：《材料科學(xué)與工藝》2015年04期

【摘要】：為了在緊固孔周引入均勻的殘余壓應(yīng)力,以延長(zhǎng)緊固孔構(gòu)件的疲勞壽命、提高其抗應(yīng)力腐蝕性能,利用ANSYS有限元軟件,建立了軸對(duì)稱(chēng)彈塑性有限元模型,對(duì)直接芯棒冷擠壓強(qiáng)化過(guò)程進(jìn)行了仿真,特別是對(duì)芯棒的前錐段曲線(xiàn)結(jié)構(gòu)形式進(jìn)行了設(shè)計(jì)與分析,研究了前錐段曲線(xiàn)形式對(duì)殘余應(yīng)力場(chǎng)分布的影響.結(jié)果表明:孔壁表面的周向殘余應(yīng)力分布復(fù)雜且不均勻,比較而言,外凸型正弦曲線(xiàn)型芯棒所產(chǎn)生的殘余壓應(yīng)力沿孔壁深度方向分布更加均勻;幾種曲線(xiàn)形式的芯棒在上表面近孔邊區(qū)域均產(chǎn)生了徑向殘余拉應(yīng)力,在孔的擠入段產(chǎn)生了軸向殘余拉應(yīng)力,但外凸型正弦曲線(xiàn)型芯棒在上述區(qū)域所產(chǎn)生的殘余拉應(yīng)力較小,且分布區(qū)域也較小.
[Abstract]:In order to introduce uniform residual compressive stress around the fastening hole in order to prolong the fatigue life and improve the stress-corrosion resistance of the fastening hole members, an axisymmetric elastic-plastic finite element model was established by using ANSYS finite element software. The reinforcement process of direct mandrel cold extrusion is simulated, especially the structure of the front cone curve of the mandrel is designed and analyzed, and the influence of the curve form of the front cone on the distribution of residual stress field is studied. The results show that the distribution of the circumferential residual stress on the surface of the hole wall is complex and uneven, and the residual compressive stress produced by the convex sinusoidal mandrel is more evenly distributed along the depth of the hole wall. Several kinds of curved mandrel have produced radial residual tensile stress in the upper surface near the hole edge, and axial residual tensile stress in the extrusion section of the hole, but the residual tensile stress of the convex sinusoidal mandrel in the above region is relatively small. The distribution area is also small.
【作者單位】： 裝甲兵工程學(xué)院裝備再制造工程系;中國(guó)航空工業(yè)集團(tuán)公司沈陽(yáng)飛機(jī)設(shè)計(jì)研究所;
【基金】：北京市自然科學(xué)基金(3093027)
【分類(lèi)號(hào)】：TG376

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本文編號(hào)：1777184