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    Method and interface elements for finite-element fracture analysis
    3.
    发明授权
    Method and interface elements for finite-element fracture analysis 有权
    有限元断裂分析的方法和界面要素

    公开(公告)号：US07505885B2

    公开(公告)日：2009-03-17

    申请号：US10350545

    申请日：2003-01-24

    申请人： Lyle R. Deobald ,  Bernhard Dopker ,  Gerald E. Mabson

    发明人： Lyle R. Deobald ,  Bernhard Dopker ,  Gerald E. Mabson

    IPC分类号： G06F9/455

    CPC分类号： G06F17/5018 ,  Y10T428/249953 ,  Y10T428/31504

    摘要： A finite element method for predicting crack opening and propagation entails defining a succession of overlapping interface elements at a potential crack plane, each element having a bound node pair and side node pairs spaced from the bound node pair to sense approach of a crack. An energy-based fracture mechanics criterion determines whether release occurs at the bound nodes and, if so, the displacement between the bound nodes is calculated based on a strain softening law. The process is repeated for each element in sequence.

    摘要翻译： 用于预测裂纹开口和传播的有限元方法需要在潜在的裂纹平面上定义一系列重叠的界面元素，每个元件具有约束节点对和与结合节点对间隔的侧面节点对以感测裂缝的接近。 基于能量的断裂力学标准确定在边界节点处是否发生释放，如果是，则根据应变软化法计算约束节点之间的位移。 每个元素按顺序重复该过程。

    Main deck cargo barrier net configuration
    4.
    发明授权
    Main deck cargo barrier net configuration 有权
    主甲板货物屏障网配置

    公开(公告)号：US06435786B1

    公开(公告)日：2002-08-20

    申请号：US09624540

    申请日：2000-07-24

    申请人： David A. Breckel ,  Timothy R. Schwartz ,  Bernhard Dopker ,  John W. Startup ,  James Homewood

    发明人： David A. Breckel ,  Timothy R. Schwartz ,  Bernhard Dopker ,  John W. Startup ,  James Homewood

    IPC分类号： B60P708

    CPC分类号： B64D9/00

    摘要： A cargo barrier net for an aircraft includes a central ring. A plurality of radially projecting webs include a radially inner end that is connected to the central ring. A radially outer end is connected to the airframe. The first circumferential web is connected to a first set of mid-portions of the radially projecting webs. A first set of mid-portions is located radially outside of the central ring. A second circumferential web is located radially outside of the first circumferential web. The second circumferential web is connected to a second set of mid-portions of the radially projecting webs. The second set of mid-portions is located radially outside of the first set of mid-portions. A third circumferential web is located radially outside of the second circumferential web. The third circumferential web is connected to a third set of mid-portions of the radially projecting webs. The third set of mid-portions is located radially outside of the second set of mid-portions. A fourth circumferential web is located radially outside of the third circumferential web. The fourth circumferential web is connected to a fourth set of mid-portions of the radially projecting webs. The fourth set of mid-portions is located radially outside of the third set of mid-portions. The radially projecting webs are connected to the circumferential webs using stitches. The radially projecting webs include a shunt with a break-out web that releases under load to allow the radially projecting webs to lengthen.

    摘要翻译： 飞机的货物防护网包括一个中央环。 多个径向突出的腹板包括连接到中心环的径向内端。 径向外端连接到机身上。 第一周向腹板连接到径向突出腹板的第一组中间部分。 第一组中部位于中心环的径向外侧。 第二周向腹板位于第一周向腹板的径向外侧。 第二周向腹板连接到径向突出腹板的第二组中间部分。 第二组中间部分位于第一组中间部分的径向外侧。 第三周向腹板位于第二周向腹板的径向外侧。 第三周向腹板连接到径向突出腹板的第三组中间部分。 第三组中间部分位于第二组中间部分的径向外侧。 第四周向腹板位于第三周向腹板的径向外侧。 第四周向腹板连接到径向突出腹板的第四组中间部分。 第四组中间部分位于第三组中间部分的径向外侧。 径向突出的腹板使用缝线连接到周向腹板上。 径向突出的腹板包括具有分离腹板的分流器，所述分离腹板在负载下释放以允许径向突出的腹板延长。