摘要
为揭示超声红外热成像检测中缺陷区域的生热机理,考虑预紧力对缺陷生热的影响,采用裂纹试件开展了预紧力分别为100、150、200 N的检测试验,发现裂纹区域温度与预紧力正相关,裂纹两端的生热量明显高于裂纹中段,尖端热斑最明显,且不同预紧力下圆形热斑最明亮。基于单自由度有阻尼位移激励系统和热源温度场叠加法建立了超声激励下裂纹生热的简易数学模型,通过计算参考点P1和裂纹尖端点P2的温度变化,发现P1点温度变化与试验结果一致,随着预紧力增大,P2点的计算结果与试验温升曲线拟合误差减小,且温升速率变化逐渐趋于一致。该模型能够较好地描述裂纹的生热过程,为超声红外热成像检测的加载参数优化提供了模型基础,具有一定的理论意义与工程价值。
In order to reveal the heat generation mechanism of crack during ultrasonic infrared thermography testing,an experiment was finished about testing a crack specimen when preload force was 100 N,150 N and 200 N respectively based on the influence of preload force on heat generation of defects,and some results were obtained.It was observed that preload force was a direct ratio of the temperature evolution at crack field.Besides,the heat generation at both ends of the crack was significantly higher than the middle section,the hot spot in tip was most obvious,and the circle hot spot was most bright.Based on single degree of freedom damped system by displacement excitation and heat source temperature field superposition principle,a simple mathematical model for heat generation of crack under ultrasound excitation was proposed.After the temperatu re evolution of the reference point P1 and the crack tip point P2 was calculated by the theory model,it was found that the temperature evolution of P1 was consistent with the experiment result,and the error would decline between the temperature evolution of P2 and the temperature evolution curves and the temperature evolution rise was consistently between the both when the preload force increased.This model can describe the heat generation process at crack and provide a model foundation for the testing parameters optimization of ultrasonic infrared thermography testing,with certain theoretical significance and engineering value.
作者
杨正伟
寇光杰
周伟
李胤
朱杰堂
张炜
Yang Zhengwei;Kou Guangjie;Zhou Wei;Li Yin;Zhu Jietang;Zhang Wei(Rocket Force University of Engineering,Xi′an 710025,China;School of Mechanical Engineering,Xi′an Jiaotong University,Xi′an 710049,China;China Aerodynamics Research and Development Center,Mianyang 621000,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2020年第S01期90-96,共7页
Infrared and Laser Engineering
基金
中国博士后科学基金(2019M650262)
陕西省自然科学基金(2020JM-354)
中国航空科学基金(201803U8003)
