Nomex蜂窝夹层结构弯曲刚度温度相关性的力学建模  

Mechanical modeling on the bending stiffness temperature dependence of Nomex honeycomb sandwich structure

作　　者：王家伟[1] 朱永祥[1] 韦成华[1] 吴丽雄 刘卫平[1] 马志亮[1] 吕玉伟 WANG Jiawei;ZHU Yongxiang;WEI Chenghua;WU Lixiong;LIU Weiping;MA Zhiliang;LV Yuwei(State Key Laboratory of Laser Interaction with Matter,Northwest Institution of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]西北核技术研究所激光与物质相互作用国家重点实验室

出　　处：《复合材料学报》2020年第2期376-381,共6页Acta Materiae Compositae Sinica

基　　金：激光与物质相互作用国家重点实验室基金(SKLLIM1601Z)

摘　　要：胶黏剂粘接性能下降导致的面板与蜂窝芯分离是Nomex蜂窝夹层结构在高温下力学性能发生退化的主要原因。为此定义了胶黏剂的等效脱粘系数为温度升高引起蜂窝夹层结构弯曲刚度下降的损伤变量,并引入面板和蜂窝芯弹性模量的温度保持系数,建立了蜂窝夹层结构弯曲刚度温度相关性的力学模型。经外伸梁三点弯曲法试验校验,所建力学模型计算值与试验值的误差在15%内,可以较好地实现蜂窝夹层结构在高温下的弯曲刚度预报。研究成果可以用于软夹心蜂窝夹层结构在高温下弯曲刚度的估算。Panel separating from honeycomb core caused by the adhesive property decreasing is the main reason which make the mechanical properties of honeycomb sandwich panel degenerate at high temperatures. Equivalent debonding coefficient and temperature retention coefficients of elastic modulus of panel and honeycomb core were defined as damage variables to reflect the extent of the damage for the bending stiffness of honeycomb sandwich panel at high temperatures. A mechanics model for bending stiffness of honeycomb sandwich structure decreasing with temperature rising was created. It shows that the physical model can reflect the principle of the bending stiffness degenerating with temperature rising perfectly. The difference between the calculated and the experimental result is less than 15%, which achieves the goal that forecasting the bending stiffness of honeycomb sandwich panel at high temperatures correctly. This research can be used to estimate the bending stiffness of soft honeycomb sandwich structure at high temperatures.

关 键 词：胶黏剂 弯曲刚度 NOMEX蜂窝 温度相关性 力学建模 

分 类 号：TN249[电子电信—物理电子学]