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总览 评价 邹广平 * , 芦颉 , 曹扬 , 刘宝君 ( 哈尔滨工程大学航天与建筑工程学院; ) 摘要: 通过实验的方法研究了钢质蜂窝夹芯板在高温下的疲劳力学行为,并对其破坏模式进行了分析和讨论。针对两个不同方向的钢质蜂窝夹芯板进行了高温(400℃)下的
邹广平*, 芦颉, 曹扬, 刘宝君
(
哈尔滨工程大学航天与建筑工程学院; )
摘要:
通过实验的方法研究了钢质蜂窝夹芯板在高温下的疲劳力学行为,并对其破坏模式进行了分析和讨论。针对两个不同方向的钢质蜂窝夹芯板进行了高温(400℃)下的三点弯曲疲劳试验,测试了在不同应力水平下夹芯板的疲劳寿命,通过数据拟合的方法得到了夹芯板的S-N曲线,并得到了该夹芯板的三点弯曲疲劳极限。试验结果表明,在高应力水平下,试件的疲劳破坏模式主要为芯体坍塌,而在应力水平较低的情况下,破坏模式主要为下面板断裂,进而裂纹向芯体扩展导致试件突然失效。
关键词:
蜂窝夹芯板;高温疲劳;三点弯曲;S-N曲线;破坏模式
ZOU Guangping*, LU Jie, CAO Yang, LIU Baojun
(
College of Aerospace and Civil Engineering, Harbin Engineering University; )
Abstract:
In this work fatigue behavior of the steel honeycomb sandwich panel at elevated temperature was investigated by fatigue test and fatigue failure modes were analyzed and discussed. Three-point bending fatigue experiments were conducted in two directions of the specimen respectively to test the fatigue life of the honeycomb sandwich panel under different stress levels at elevated temperature reach to 400℃. S-N curves and the three-point bending fatigue limits of two directions of the specimen were obtained with data fitting calculation method. The experimental results indicated that the major fatigue damage pattern at the high stress level was core collapsing while failure mode at lower stress level was face sheet of bottom side cracked and propagated to the honeycomb core result in suddenly failure.
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