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针对蜂窝梁腹板在纯弯状态下的弹性屈曲,利用ANSYS 15.0建立了正六边形孔蜂窝梁腹板在纯弯应力状态下的有限元模型,研究了四边简支开孔板在纯弯状态下的屈曲模式,分析了孔洞尺寸对蜂窝梁腹板屈曲临界应力的影响,提出了纯弯状态下开孔板的屈曲系数计算式,得到了蜂窝梁开孔腹板在纯弯状态下的高厚比限值。研究表明:无论开孔数目多少,最大平面外屈曲位移均发生在各孔洞正上边缘;蜂窝梁腹板高厚比是影响开孔板屈曲临界应力的主要因素,建议对于弯矩作用较大的蜂窝梁腹板取0.6<γ<0.7,0.7<β<0.8的孔洞尺寸容易实现稳定性和经济性要求(γ为孔高比,β为距高比);拟合出的开孔板屈曲系数计算式,误差不超过5%,具有良好的精度。
Aiming at the elastic buckling of honeycomb web under pure bending condition, the finite element model of honeycomb web with regular hexagonal hole under pure bending stress was established by ANSYS 15.0. The influence of the hole size on the buckling critical stress of honeycomb webs is analyzed. The formulas for calculating the buckling coefficients of the honeycomb webs under buckling are given. Thickness ratio limit. The results show that the maximum out-of-plane buckling displacement occurs at the upper edge of each hole, regardless of the number of holes. The ratio of height to thickness of honeycomb webs is the main factor affecting the critical buckling stress of perforated plates. The hole size of honeycomb webs with 0.6 <γ <0.7 and 0.7 <β <0.8 easily achieves the stability and economy requirements (γ is the hole height ratio and β is the height-to-height ratio); and the calculated buckling coefficient of the perforated plate Type, the error does not exceed 5%, with good accuracy.