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采用三点弯曲法对六边形Nomex蜂窝夹层板在不同温度下的弯曲性能进行了研究。根据蜂窝芯的正交各向异性特征,分别取面内的两个主方向为长度方向制作了L试件和W试件。在25℃、50℃、100℃、150℃和180℃下开展了弯曲实验,确定了弯曲刚度与剪切刚度。结果表明:随着温度的升高,两个方向上的弯曲刚度与剪切刚度均明显下降;当温度升高到180℃时,弯曲刚度与剪切刚度均低于常温时的20%。对于蜂窝夹层板在横向力学载荷作用下的破坏模式,当温度低于50℃时,多出现面板凹陷;当温度达到150℃甚至更高时,多出现面板与蜂窝芯脱离并向外凸出。文中研究成果可以为Nomex蜂窝夹层板在变温或激光辐照下的工程应用提供参考。
The bending behavior of hexagonal Nomex honeycomb sandwich panels at different temperatures was investigated by three-point bending method. According to the orthogonal anisotropy of the honeycomb core, L specimens and W specimens were respectively taken from the two main directions in the plane for the length direction. Bending tests were carried out at 25, 50, 100, 150 and 180 ° C to determine the flexural rigidity and the shear stiffness. The results show that with increasing temperature, the bending stiffness and the shear stiffness in both directions decrease obviously. When the temperature rises to 180 ℃, the bending stiffness and shear stiffness are both lower than 20% at normal temperature. For the failure modes of honeycomb sandwich panels under transverse mechanical loads, panel denting occurs more often when the temperature is lower than 50 ° C. When the temperature reaches 150 ° C or higher, the panel emerges more outward from the honeycomb core. The research results in this paper can provide reference for the engineering application of Nomex honeycomb sandwich panel under the condition of variable temperature or laser irradiation.