论文部分内容阅读
采用欧拉杆屈曲模型,以端部约束系数μ定量表征夹层结构Z-pin端部结合程度,μ取值越小,Z-pin端部和面板结合程度越高,压缩载荷下更不易失稳。以不同参数K/X-cor结构的压缩试验为背景,分别研究了Zpin直径和折弯长度对压缩试验性能的影响。通过显微观察并利用“混合法则”比较了Z-pin直径对K/X-cor结构的增强效率。从减重方面考虑,探讨了折弯长度对K-cor结构比强度和比刚度的影响,并得到最优折弯长度半解析表达式。结果表明:K-cor结构中Z-pin增强效率高且对结构损伤小,远优于X-cor结构;其比强度和比刚度随折弯长度的增加呈先增加后降低的趋势,不同参数的K-cor结构折弯长度存在最佳值。
The Euler rod buckling model was used to quantitatively characterize the Z-pin end bonding degree of the sandwich structure with the end restraint coefficient μ. The smaller the value of μ, the higher the bond between the Z-pin end and the face plate, and the more stable under the compressive load. Based on the compression tests of K / X-cor structure with different parameters, the influence of Zpin diameter and bending length on the performance of compression test was studied. The enhanced efficiency of the Z / pin diameter for the K / X-cor structure was compared by microscopic observation and using “mixing rule ”. From the aspect of weight loss, the influence of bending length on the specific strength and stiffness of K-cor structure was discussed, and the semi-analytical expression of bending length was obtained. The results show that the K-cor structure has the advantages of high efficiency of Z-pin reinforcement and little damage to the structure, which is much better than that of the X-cor structure. The specific strength and stiffness increase first and then decrease with the increase of bending length. The K-cor structure bending length has the best value.