玻璃钢-聚氨酯泡沫夹层板弯曲失效研究  

The bending failure of fiberglass-polyurethane foam sandwich panel

作　　者：张雁[1,2] 杨树兴[1] 魏传锋[3] 

机构地区：[1]北京理工大学宇航学院,北京100081 [2]中国空间技术研究院钱学森空间技术实验室,北京100094 [3]中国空间技术研究院载人航天总体部,北京100094

出　　处：《航天器环境工程》2014年第6期614-619,共6页Spacecraft Environment Engineering

基　　金：国家自然科学基金项目(编号:51105034)

摘　　要：采用真空灌注方法研制了玻璃纤维-聚氨酯泡沫夹层板,通过理论推导、数值仿真及试验验证对该夹层板的弯曲失效特性进行了研究,得到了实际失效载荷以及两种失效模式。研究表明,玻璃纤维-聚氨酯泡沫夹层板的载荷变形曲线中会出现2处拐点:第一拐点对应第一失效模式,其表征为表层玻璃纤维被拉伸断裂;第二拐点对应第二失效模式,其表征为芯体泡沫被剪切开裂。In order to study the bending failure mechanism of composite sandwich panels, the fiberglass-polyurethane foam sandwich panel is designed and manufactured by vacuum infusion. A theoretical model for its failure is built and the bending test is carried out, as well as the numerical simulation. The failure load is obtained, and two failure modes are revealed during the bending process. An explanation of two inflexion points observed in the load-deflection curve of the glass fiber-polyurethane foam sandwich panel is made. It is concluded that the first inflexion point, corresponding to the first failure mode, is owing to the tensile splitting of the surface glass fiber, and the second one, corresponding to the second failure mode, is due to the shear force splitting of the middle foam.

关 键 词：复合材料 夹层板 失效机理 弯曲试验 

分 类 号：V524.7[航空宇航科学与技术—人机与环境工程]