考虑弹性支撑时蜂窝芯剪切屈曲强度的插值求解方法

发布时间：2018-04-30 15:49

  本文选题：蜂窝 + 弹性支撑　； 参考：《复合材料学报》2017年06期

【摘要】：结合最小余能原理和薄板剪切屈曲失稳理论,给出了蜂窝芯等效剪切屈曲强度的理论表达式。将胞壁等效为受弹性支撑的梁,通过对固支和简支条件下的屈曲强度进行插值求解实际胞壁间为弹性支撑时的剪切屈曲强度。然后,利用三点短梁弯曲试验测量常用Nomex蜂窝芯的剪切屈曲强度,并与弹性支撑下的理论解进行对比,试验结果与理论解吻合较好,验证了理论方法的有效性。最后,讨论了剪切屈曲强度的各向异性及蜂窝高度对剪切屈曲强度的影响。结果表明,剪切屈曲强度的各向异性程度与蜂窝高度无关,但随着蜂窝高度的增加,蜂窝芯的纵向和横向剪切屈曲强度均逐渐减少,减小幅度逐渐减缓。
[Abstract]:Based on the principle of minimum complementary energy and the theory of shear buckling instability of thin plates, the theoretical expression of equivalent shear buckling strength of honeycomb cores is given. The cell wall is equivalent to the elastic braced beam, and the shear buckling strength is calculated by interpolating the buckling strength under the condition of clamping and simply supporting. Then the shear buckling strength of commonly used Nomex honeycomb cores is measured by three point short beam bending test and compared with the theoretical solution under elastic support. The experimental results are in good agreement with the theoretical solution and the validity of the theoretical method is verified. Finally, the anisotropy of shear buckling strength and the effect of honeycomb height on shear buckling strength are discussed. The results show that the anisotropy of shear buckling strength is independent of honeycomb height, but with the increase of honeycomb height, the longitudinal and transverse shear buckling strength of honeycomb core decreases gradually, and the decreasing amplitude gradually decreases.
【作者单位】： 西北工业大学航空学院;
【基金】：西北工业大学研究生创意创新种子基金(Z2015046)
【分类号】：TB383.4
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本文编号：1825167