加载频率对悬臂梁振动疲劳特性的影响

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (6) : 243-247.

论文

加载频率对悬臂梁振动疲劳特性的影响

王锦丽1;李玉龙1;胡海涛1;薛璞1;刘小冬2;曾宁2;刘元镛1

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The effect of load frequency on the vibration fatigue behavior of cantilever beam

WANG Jin-li1, LI Yu-long1;HU Hai-tao1; XUE Pu1; LIU Xiao-dong2; ZENG Ning2; LIU Yuan-yong1

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文章历史 +

摘要

研究了加载频率对悬臂梁振动疲劳特性的影响。首先，给三组相同的悬臂梁结构分别施加三种不同频率（悬臂梁的固有频率，略大于固有频率和略小于固有频率）的正弦激励，使其具有相同的初始应力，试验测得应力随循环次数的变化规律；其次，在试验测得应力历程的基础上，计算悬臂梁的疲劳损伤量，研究在相同初始应力下不同加载频率对同一悬臂梁振动疲劳特性的影响；最后，将预估结果与试验测得的固有频率下降量作了对比。结果表明：加载频率对振动疲劳寿命有较大的影响，文中给出的预估结果与试验结果比较吻合

Abstract

The effect of load frequency on the vibration fatigue behavior of cantilever beam was studied. First, three kinds of sine loads with different frequencies were loaded on three groups of cantilever beams. The initial stress on each specimen is the same. The variations of stress vs cycle for each specimen were measured. Then, base on the stress history from experiment, the fatigue damage of cantilever beam was calculated, and the effect of different load frequencies on vibration fatigue behavior of the same cantilever beam had been investigated. Finally, the calculation results was compared with the results of the frequency decrease that measured by experiment. The results show: the load frequencies have a large effect on vibration fatigue life, the calculation results was agreed well with the experiment results

导出引用

王锦丽;李玉龙;胡海涛;薛璞;刘小冬;曾宁;刘元镛. 加载频率对悬臂梁振动疲劳特性的影响[J]. 振动与冲击, 2011, 30(6): 243-247

WANG Jin-li;LI Yu-long;HU Hai-tao;XUE Pu;LIU Xiao-dong;ZENG Ning;LIU Yuan-yong . The effect of load frequency on the vibration fatigue behavior of cantilever beam[J]. Journal of Vibration and Shock, 2011, 30(6): 243-247