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The equation to determine the buckling direction angle, β say, was obtained and, as illustration, the solution curves of the equation for θ=45° and θ=30° were plotted.
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In other words, the stiffness of the material in the buckling direction is instantaneously negative.
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Sufficient local imperfections may cause a reversed global buckling direction.
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| | Buckling of a woven fabric is analyzed in this paper when it is subjected to a simple shear in warp direction.The equation to determine the buckling direction (buckling wave direction) is obtained and it is found that the buckling direction is related to the critical amount of shear.It is shown that the out-of-plane buckling of fabric is possible and only a flexural buckling mode can exist.The buckling condition for flexural mode is obtained and the curve for that is illustrated. | | 分析了织物受沿经向简单剪切时的屈曲 ,得到确定织物屈曲方向 (屈曲波的方向 )的方程 ,该方程表明织物屈曲方向与临界剪切值有关 .还证明了织物受沿经向简单剪切时会发生离面屈曲 ,并且只存在一种屈曲模态——弯曲屈曲模态 ,得到了该屈曲模态的屈曲条件及屈曲条件曲线 . | | 文摘来源 | | Objective To compare the fuctional and morphological changes of the cervical spine of 18 patients (28 disci herniations) under different directions in herniation of cervical disc (HCD).Methods To study the effect of different directions of traction on the movement of herniated disc,compression index of spinal cord,changes of intervertebral space and the influence on cases with degeneration by MRI.Results There were differences among the effects ... | | 目的 对 18例患者总计突出颈椎间盘 2 8个 ,比较不同牵引方向对颈椎间盘突出症(HCD)的颈椎功能变化规律。方法 借助MRI影象扫描研究不同牵引方向对颈椎突出间盘的运动、脊髓受压指数、椎间隙的变化及伴有变性病例的作用。结果 不同的牵引方向对间盘突出的作用是有差异的 ,屈曲牵引使间盘部分还纳最为明显。脊髓受压指数在屈曲方向牵引最低。伸展牵引时椎间盘突出缩小组的后缘椎间隙减小明显。屈曲牵引时椎间盘缩小组与无变化组的后缘变化差异不大 ,两种牵引方向对前缘影响均无差异。各种方向牵引伴有变性者的形态变化不明显。结论 HCD改变了正常椎关节的微细形态结构 ,对常规牵引方向的规律宜灵活运用。脊髓受压指数比间盘突出大小更能反映脊髓受损的实质。牵引对伴有变性者意义可能不大。 | | 文摘来源 | | The buckling of a fabric sheet subjected to a uniaxial tension in a direction making arbitrary angle, θ(0°<θ<90°) say, with respect to that of warp is investigated. The equation to determine the buckling direction angle, β say, was obtained and, as illustration, the solution curves of the equation for θ=45° and θ=30° were plotted. It is shown that when the fabric sheet is subjected to tension in non_warp/non_weft direction the out_of_plane buckling of fabric is possible, two buckling modes (flexura... | | 对编织物受沿与其经线方向成任意角度θ(0 <θ<90°)的单向拉伸时的屈曲进行了分析 ,得到了确定其屈曲方向角 β的方程 ,给出了当θ=4 5°和θ =30°时确定屈曲方向角β的方程的解曲线· 证明了当编织物受到沿非经向 /非纬向的单向拉伸时 ,屈曲是可能的 ,得到了两种可能的屈曲模态 (弯曲模态和拉伸模态 )以及相应的屈曲条件· Zhang和Fu(2 0 0 1)的结果为其结论的特例 | | 文摘来源 | |   | | << 更多相关文摘 |
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