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金属蜂窝夹芯板高温疲劳行为的实验研究

发表时间:2011-08-15  浏览量:1349  下载量:571
全部作者: 邹广平,芦颉,曹扬,刘宝君
作者单位: 哈尔滨工程大学航天与建筑工程学院
摘 要: 通过三点弯曲疲劳实验,研究钢质蜂窝夹芯板在高温下的疲劳力学行为,并对其疲劳破坏模式进行分析和讨论。针对正交各向异性钢质蜂窝夹芯板的2个不同方向进行400℃高温下的三点弯曲疲劳实验,测试其在不同应力水平下的疲劳寿命,通过最小二乘法拟合所得数据,得到了钢质蜂窝夹芯板的S�N曲线,同时估算了该夹芯板的三点弯曲疲劳极限。实验结果表明:在高温条件下,W向试件的疲劳性能好于L向试件;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,进而裂纹向蜂窝芯子扩展导致试件突然失效。
关 键 词: 固体力学;高温疲劳行为;三点弯曲疲劳实验;蜂窝夹芯板;S�N曲线;破坏模式
Title: Experimental study on fatigue behavior of the metal honeycomb sandwich panel at elevated temperature
Author: ZOU Guangping, LU Jie, CAO Yang, LIU Baojun
Organization: College of Aerospace and Civil Engineering, Harbin Engineering University
Abstract: In this paper, fatigue behavior of the steel honeycomb sandwich panel at elevated temperature was investigated by three point bending fatigue test and fatigue failure modes of the specimens were analyzed and discussed. Three point bending fatigue tests were conducted in two directions of the orthotropic steel honeycomb sandwich panel respectively and fatigue lives of the specimens in several stress levels at high temperature reach to 400℃ were obtained. S�N curves and the three�point bending fatigue limits of two directions of the specimen were obtained with least square method. The experimental results indicated that fatigue properties of the specimen in W�direction were better than that in L�direction, and 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 which resulted in suddenly failure.
Key words: solid mechanics; high�temperature fatigue behavior; three point bending fatigue test; honeycomb sandwich panels; S�N curve; failure mode
发表期数: 2011年8月第15期
引用格式: 邹广平,芦颉,曹扬,等. 金属蜂窝夹芯板高温疲劳行为的实验研究[J]. 中国科技论文在线精品论文,2011,4(15):1403-1408.
 
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