| 摘要: |
| 为探究飞机壁板带孔部位在喷丸成形时产生的孔区异形，应力集中等问题，文中利用有限元方法对2024铝合金带孔板喷丸后孔区域变形情况进行研究，分析了喷丸区域离孔的距离（孔边距L）对孔变形程度的影响；讨论了板料厚度，喷丸速度，喷丸覆盖率等喷丸工艺参数对带孔板孔变形程度的影响规律；绘制了孔异形程度B<1%和B<2%两种情况下不同喷丸参数时应采取的最小孔边距曲线。结果表明：孔边距过小时（0≤L＜1 mm）孔异性程度最大，应力集中明显；板料厚度可以有效的减小孔异形程度，板厚大于6 mm时孔异形程度基本小于1%；当孔异形程度一定时，喷丸速度和喷丸覆盖率越大，就需采用更大的孔边距，覆盖率F>140%时，孔边距需增加到17 mm以上才能使孔异形程度降低到1%以下。 |
| 关键词: 2024铝合金 带孔板 有限元 超声波 喷丸 |
| DOI：10.11933/j.issn.1007-9289.2015.02.012 |
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| Ultrasonic Peening Forming Process in Perforated Plate Based on Finite Element Simulation |
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LU Shihong, CHENG Shumin, LIU Chaoxun, ZHU Yifeng1,2
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1.College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016;2.Technology Research Institute, AVIC Xi’an Aircraft Industy (Group) Company Ltd., Xi’an 710089
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| Abstract: |
| To explore the problems of hole deformation and stress concentration induced by peening forming on aluminum alloy perforated plate,the finite element method was adopted simulate the hole deformation on 2024 aluminum alloy perforated plate. The influences of distance from the peening region to the hole (the hole margins L) on hole deformation were analyzed. The influence of the parpmeters, such as sheet thickness, shot peening speed and surface coverage, on the degree of hole deformation were discused. The hole margins curve was drawn to show which distance should be selected when the value of hole deformation B<1% and B<2%.The results show that the hole deformation is the biggest and the stress concentration is significant when the hole margins is small(0≤L<1). Sheet thickness has an aimportant influence on the value of hole deformation, which decreased to 1% when the sheet thickness increases to 6 mm. Large hole margins should be selected with the increase of shot peening speed and surface coverage when the value of hole deformation is constant, when the surface coverage F>140%, the value of hole deformation reduced to less than 1% on the condition that the hole margins increases to more than 17 mm. |
| Key words: 2024 aluminum alloy perforated plate finite element ultrasonic peening |
