钢桥疲劳裂缝的红外热成像无损检测

发布时间：2018-04-01 21:40

本文选题：钢桥　切入点：疲劳裂缝　出处：《应用科学学报》2016年01期

【摘要】：利用裂缝尖端应力集中的特点,提出一种钢桥疲劳裂缝无损检测方法.从理论上建立钢结构表面温度变化与其应力之间的本构关系模型,在实验中采用红外热成像法测试构件孔边畸变温度,计算构件相应点处的畸变应力,确定构件裂缝.以带孔平板为例,应用上述模型分析了周期荷载作用下圆孔周边点的应力和表面温度之间的关系.实验结果显示,当t=0.05 s时,圆孔左右节点温度降低达到最小值,上下节点温度升高达到最大值;当t=0.15 s时,左右节点温度升高达到最大值,上下节点温度降低达到最小值.实验结果符合理论模型,表明该检测方法可行.
[Abstract]:Based on the characteristics of stress concentration at crack tip, a nondestructive testing method for fatigue crack of steel bridge is proposed. The constitutive relation model between surface temperature change and stress of steel structure is established theoretically. In the experiment, infrared thermal imaging method is used to measure the distortion temperature of the hole edge of the member, to calculate the distortion stress at the corresponding point of the member, and to determine the crack of the member. Taking the plate with holes as an example, The above model is used to analyze the relationship between the stress and surface temperature at the peripheral point of the circular hole under cyclic loading. The experimental results show that when t0. 05 s, the temperature of the left and right nodes of the circular hole decreases to the minimum and the temperature of the upper and lower nodes increases to the maximum. When t = 0.15 s, the temperature of the left and right nodes reaches the maximum value, and the temperature of the upper and lower nodes decreases to the minimum. The experimental results agree with the theoretical model and show that the detection method is feasible.
【作者单位】：武汉科技大学汽车与交通工程学院;
【基金】：国家自然科学基金(No.51578430) 湖北省教育厅科学技术研究计划优秀中青年人才项目基金(No.Q20121109) 湖北省交通运输厅科技项目基金(No.2014-721-1-9)资助
【分类号】：U446

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