摘要
通过不同Z-pin角度(15°和25°)和夹芯厚度(8 mm和12.7 mm)的X状Z-pin增强泡沫夹层材料的剪切性能试验,与相同材料同尺寸的未增强件进行对比,考察X状Z-pin对泡沫夹层结构的增强作用。试验结果表明,X状Z-pin增强使材料的剪切强度和刚度都有较大幅度的提高;同时,Z-pin的加入使该结构具有与传统泡沫夹层材料不同的剪切破坏形式。在此基础上,结合空间网架结构和等效夹杂方法,提出了X状Z-pin增强泡沫夹层结构剪切刚度模型,计算结果与试验值符合良好。结果表明,X状Z-pin增强不仅能大幅度提高泡沫夹层结构的剪切性能,并具有良好的可设计性,可以通过改变Z-pin角度和材料等改变其力学性能。
A series experiments were carried out to investigate the responses of X-Z-pinned foam core sandwich materials under shear loading, including inclination angles of 15° and 25° with foam core thickness of 12.7 mm and 8 mm, each group of which had a contrasted one. The experimental results show that the Z-pinned foam core can reinforce the shear modulus and strength of the sandwich markedly. At the same time, the X- Z- pin reinforced material has a special failure pattern which is different from the unreinforced one. On the basis of integrating the space truss frame and equivalent inclusion method, a method for predicting the shear modulus of the composites was established. The theoretical prediction coincides with the experimental data well. In addition, the novel Z- pinned cores are found to exhibit more favorable programmable property than the conventional sandwich cores. Altering the pinned angle and pin materials can ameliorate the mechanical properties of sandwich.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2007年第6期140-146,共7页
Acta Materiae Compositae Sinica
基金
国家自然科学基金项目(10572116)
航空科学基金项目(04B53013)