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首页> 外文期刊>日本船舶海洋工学会論文集 >初期不整を有する殻構造の様々な応力状態における座屈強度
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初期不整を有する殻構造の様々な応力状態における座屈強度

机译：在各种应力​​状态下具有初始缺陷的壳体结构的屈曲强度

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摘要

円筒殻や球殻などの穀構造の座屈強度が形状初期不整に よって大きく低下することは良く知られている。それぞれの 座屈強度の低下割合は、応力状態（荷重負荷状態）によって 異なり、DnVをはじめ、ECCSやAPIなどのルールでは、円 筒殻について、軸圧縮、一様圧力、横圧、振りの各荷重下で の初期不整による座屈強度の低下割合が示されている。%It is well known that the buckling strength of spherical shell and cylindrical shell is reduced by initial shape imperfections and the reduction rate is much influenced by stress conditions. This reduction rate will vary in accordance with the imperfection shape even for the same maximum magnitude. In this study, the geometrical non-linear FE analysis is performed in order to examine what kind of initial imperfection shape will most reduce the buckling strength of cylindrical shell, spherical shell, and ellipsoidal spherical shell under various stress conditions, such as one-directional compression, two-directional compressions, and combined one-directional compression and another directional tension. In the case of both-ends simply-supported cylindrical shells under axial compression, the axi-symmetrical shape imperfection, which is axially of the buckling mode, reduces the buckling strength more than any other imperfection shape with the same maximum magnitude. In contrast to this, cylindrical shells under lateral pressure or under external pressure (combined lateral and axial end pressure) , spherical shell under external pressure and in the partial filling condition that produces the meridian compressive and latitude tensional stress conditions just below the equator, and ellipsoidal spherical shell under the same loading condition as for spherical shell, the imperfection of asymmetrical buckling mode reduces the buckling strength more than any other imperfection shape. The buckling strength of cylindrical shell is much influenced by imperfection mode, while that of spherical and ellipsoidal spherical shells less influenced. In addition, the buckling strength of sandwich (laminated) shell structures with steal skin plate and foam core are examined. The sandwich shell structure is found to have a larger buckling strength and less imperfection sensibility than the homogeneous shell with the same weight.
机译：众所周知，最初的形状缺陷极大地降低了诸如圆柱壳和球形壳等晶粒结构的屈曲强度。每种屈曲强度的降低率取决于应力状态（加载状态），并且根据诸如DnV，ECCS和API的规则，对于圆柱壳，轴向压缩，均匀压力，侧向压力，摆动显示了由于载荷作用下的初始缺陷而导致的屈曲强度下降率。 ％众所周知，球形壳和圆柱壳的屈曲强度会因初始形状缺陷而降低，并且压下率受应力条件的影响很大，即使在相同的最大量值下，压下率也会根据缺陷形状而变化。在这项研究中，进行几何非线性有限元分析，以研究哪种初始缺陷形状将在各种应力​​条件（例如单向应力）下最大程度地降低圆柱壳，球形壳和椭圆形球形壳的屈曲强度。压缩，双向压缩以及单向压缩和另一方向拉伸的组合。在轴向压缩的两端简单支撑圆柱壳的情况下，轴向对称的变形（轴向屈曲模式）减少了屈曲强度比具有相同最大强度的任何其他不完美形状要大得多。在侧向压力或外部压力（横向和轴向终端压力组合）下的圆柱壳，在外部压力下且在局部填充条件下产生子午线压缩和纬度拉伸应力条件的球形壳，正好位于赤道正下方，而椭圆形球形壳则在赤道正下方。在与球形壳体相同的加载条件下，不对称屈曲模式的缺陷比其他任何缺陷形状的屈曲强度降低的程度更大；圆柱壳的屈曲强度受缺陷模式的影响较大，而球形和椭圆形球形壳的屈曲强度的影响较小。此外，还研究了具有偷皮板和泡沫芯的夹心（层状）壳结构的屈曲强度，发现该夹心壳结构比相同重量的均质壳具有更大的屈曲强度和不完美的敏感性。

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