The Elastic Properties of Sandwich Structure with Z-pinned Foam Core
The Elastic Properties of Sandwich Structure with Z-pinned Foam Core
复制标题
Z型钉扎泡沫芯夹层结构的弹性性能
DOI：
10.1177/0731684407087157
复制
发表时间：
2009-04-01
影响因子：
3.1
通讯作者：
Huang Tao
中科院分区：
文献类型：
--
作者：
Du, L.;Jiao Guiqiong;Huang Tao
Z钉泡沫夹芯是一种新型的结构材料。它是由拉出的碳纤维棒组成的桁架网络加固轻质泡沫芯材，然后在复合材料面板之间叠层而成。本研究提出了一种获得Z销增强泡沫塑料芯材等效弹模数的方法。这些销在泡沫中被视为圆柱体夹杂物，同时它们充当桁架芯。基于Mori-Tanaka平均场理论来考虑销钉与泡沫之间的相互作用，提出了一种计算含有随机取向销钉的泡沫的有效模数的解析方法。在空间桁架的概念下，提出了计算销式桁架铁心有效弹性性能的均匀化模型。发展了一阶剪切理论来模拟Z形销增强泡沫夹层的力学行为。然后，进行了岩心剪切试验，以验证理论模型的有效性。此外，还给出了碳纤维销钉增强Rohacell泡沫芯材的数值算例。分析结果表明，Z形销的取向、体积分数和性能对增强芯的等效模数有很大影响。
Z-pinned foam core sandwich is a novel structural material. It is produced by reinforcing lightweight foam core with a truss network of pultruded carbon fiber rods and then laminated between composite face sheets. This investigation presents an approach to obtain the equivalent moduli of Z-pin reinforced foam core. The pins are treated as cylinder inclusions in foam at the same time they act as truss core. Based upon the Mori—Tanaka mean-field theory to account for the interaction between the pins and foam, an analytical approach is developed to assess the effective moduli of foam containing randomly oriented pins. Under the concept of space truss frame, a homogenization model is presented to calculate the effective elastic properties of pins truss core. First-order shear theory is developed to simulate the mechanical behaviors of a Z-pin reinforced foam core sandwich. Then, core shear tests were carried out to check the validity of a theoretical model. Furthermore, numerical examples have been given for a carbon fiber pins reinforced Rohacell foam core. Analysis results indicate that the equivalent moduli of reinforced core are strongly affected by the orientation, the volume fraction, and the properties of Z-pins.