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铝板T型接头背面筋板位置检测方法研究 被引量:2
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作者 吴东翰 韩赞东 +1 位作者 孟繁悦 都东 《传感技术学报》 CAS CSCD 北大核心 2019年第4期537-541,共5页
采用涡流检测方式检出铝板T型接头背面筋板位置,检测误差范围在0.48 mm之内。欲检测背面筋板位置,线圈所生磁场必须能穿透铝盖板,为此先对待检试件尺寸及线圈内、外径、线径、厚度等参数进行分析,计算了线圈产生的磁场强度分布,确定了... 采用涡流检测方式检出铝板T型接头背面筋板位置,检测误差范围在0.48 mm之内。欲检测背面筋板位置,线圈所生磁场必须能穿透铝盖板,为此先对待检试件尺寸及线圈内、外径、线径、厚度等参数进行分析,计算了线圈产生的磁场强度分布,确定了线圈尺寸。使用有限元软件comsol仿真不同检测频率下的涡流穿透深度,同时考虑实际工业应用中需有较高的扫查速率,确定了检测频率。设计并制作了检测电路,使用ADuC812单片机为核心,控制AD9854芯片产生正弦激励信号作为载波将背板信号进行调制,再用相敏检波检出背板信号。实际检出波形与所预期结果相符,能清楚判别背面筋板中心位置,误差范围小,本研究拓展了涡流检测技术的应用领域。 展开更多
关键词 涡流检测 t型接头检测 位置检测 相敏检波 电磁场仿真
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Using Thermoelastic Stress Analysis to Detect Damaged and Hot Spot Areas in Structural Components
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作者 Freire J. L. F. Waugh, R. C. +1 位作者 Fruehmann, R. Dulieu-Barton, J. M. 《Journal of Mechanics Engineering and Automation》 2015年第11期623-634,共12页
This paper discusses the suitability of using TSA (thermoelastic stress analysis) as an advanced tool to detect damaged areas and highly stressed (hot spot) areas in structural components. Such components can be, ... This paper discusses the suitability of using TSA (thermoelastic stress analysis) as an advanced tool to detect damaged areas and highly stressed (hot spot) areas in structural components. Such components can be, for example, parts of large structural panels built of welded metallic or composite materials. Besides detecting hot spot areas, it is expected that stresses in these areas can be suitably quantified and processed in order to predict crack initiation and propagation due to in-service loads. The paper starts with references to selected review and application articles on the subject. Two simple laboratory experiments are presented which illustrate the quality of the results that can be achieved using TSA. In the first experiment, a stainless steel T-joint designed to model a welded structural component is analysed. The T-joint had a machine-notched crack-like flaw close to the component's weld toe. The qualitative and quantitative experimental results determined along four specified areas of the T-joint model showed that TSA can indeed be used as a tool to detect loaded cracks and hot spots in large metallic structures, and that stresses can be accurately evaluated. In the second experiment, a prismatic bar made of CFRE (carbon fibre-reinforced-epoxy) was tested to locate three subsurface areas of damage introduced beforehand into the component. Two of these inside damaged areas were detected to be 3.1 mm and 7.1 mm from the observed surface. The positive results achieved with the two lab experiments, along with a review of the selected research publications, indicate that TSA application can be extended to the real-world field of structural components. Topics to be addressed in this research field should have to do with components that work under random or quasi-cyclic service loading, problems where adiabatic conditions do not prevail, and reduction of the cost of infra-red cameras. 展开更多
关键词 tSA stress distribution NDt stress distribution stress concentration CRACK t-JOINt infra-red.
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