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Axial-Weld Land Buckling in Compression-Loaded Orthogrid Cylinders

机译：压载正交格栅中的轴向焊接地屈曲

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摘要

Large stiffened cylinders used in launch vehicles, such as the space shuttle external tank, are manufactured by welding curved panels into complete barrels. The effects of the axial-weld lands between the panels on the buckling strength of unpressurized cylinders are studied, along with the interaction between the acreage stiffener arrangement and the weld land geometry. The relatively thick, unstiffened axial-weld lands are shown to significantly reduce the buckling load when the cylinder is loaded in uniform axial compression, and a relationship between the reduction in buckling load and the orthogrid design is shown. Reducing the width of the weld lands is shown to be the most effective means of minimizing the reduction in buckling strength, and thicker weld lands are shown to not always increase their buckling resistance. Detailed models with individual stiffeners modeled as beams are used to show that the weld land buckling phenomenon is very sensitive to the specific location and geometry of stiffeners near the axial-weld lands. It is also shown that the buckling strength can be significantly unproved by ensuring that the distance between the weld land and the adjacent longitudinal stiffener is minimized.
机译：运载火箭中使用的大型加劲圆柱，例如航天飞机外部水箱，是通过将弯曲的面板焊接到完整的枪管中来制造的。研究了面板之间的轴向焊接区对未加压圆柱体的屈曲强度的影响，以及加强筋的面积与焊接区几何形状之间的相互作用。当汽缸以均匀的轴向压缩力加载时，相对较厚的，未加固的轴向焊接区被显示为显着降低了屈曲载荷，并且示出了屈曲载荷的减少与正交网格设计之间的关系。减小焊缝的宽度被证明是使屈曲强度降低最小的最有效方法，而较厚的焊缝并不能总是增加其抗弯强度。使用具有以梁为模型的单个加劲肋的详细模型来显示，焊缝的屈曲现象对轴向焊接焊缝附近的加劲肋的特定位置和几何形状非常敏感。还显示出，通过确保最小化焊接区域和相邻的纵向加强筋之间的距离，屈曲强度可以得到明显的改善。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2011年第1期|p.199-207|共9页
  • 作者

    Robert P. Thornburgh;

  • 作者单位

    U.S. Army Research Laboratory, Hampton, Virginia 23681;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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