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《无损探伤》2020,(2)
利用磁致伸缩导波技术针对缆索的腐蚀检测需求开展应用研究。首先,分析平行钢丝桥梁缆索的结构形式和腐蚀缺陷的成因及特征,确定缆索最容易发生腐蚀损伤的区域为过渡段索体。其次,结合这一区域的结构特征,给出了磁致伸缩导波技术检测缆索腐蚀损伤的原理。再次,制作了两根过渡段索体带有人工腐蚀缺陷的样索,并开展了试验研究,结果表明该技术可实现3%集中和离散两种分布形式腐蚀缺陷的检测。最后,分别在一座斜拉桥和一座拱桥上开展了实桥试验,根据检测结果对过渡段索体存在腐蚀损伤的缆索进行了开索验证。该技术在检测中的应用为桥梁缆索的养护提供了有力支持,为桥梁维护和换索等决策的制定提供了依据。 相似文献
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压力容器无损检测--换热器的无损检测技术 总被引:2,自引:3,他引:2
换热器是用于热量交换的压力容器之一,在石油、化工、电力和城市供暖等方面得到广泛使用。综述了管壳式换热器在制造和使用过程可能出现的缺陷和分别采用的各种无损检测方法,包括射线、超声、磁粉、渗透、电磁涡流和磁记忆检测等技术,分别介绍了这些无损检测方法在换热器的制造和使用过程中的应用情况和特点。 相似文献
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The number of structurally deficient or functionally obsolete bridges is likely to increase in coming years due to continued bridge aging and deterioration and a decrease in funding needed to maintain and repair these structures. In the case of suspension bridges, problems arise due to corrosion and wire breaks within the main cables of the bridge. The magnetic flux leakage (MFL) method has been known for many years and is used for inspection work in different fields, such as the non-destructive evaluation (NDE) of pipelines, arial tramways or stay cable bridges. A special characteristic of the main cables of suspension bridges is the presence of steel wrapping, which is used to compact the cable and hold it in shape. If a NDE by means of magnetic methods is performed on such a cable, disturbances due to the wrapping can be expected in the measured signal. Furthermore, the very large diameters of these cables (up to 500 mm) poses an unsolved challenge in the application of magnetic non-destructive testing methods.The finite element method (FEM) and other simulation techniques are widely used in any field of engineering. The possibility to simulate different scenarios and the ability to quantify physical properties at any position where real measurements cannot be performed are among the main advantages of such methods. In this work, a FE model is presented to investigate the influence of the steel wrapping on MFL data. After the characterization of the disturbance, a postprocessing algorithm to eliminate the disturbances is discussed. Further, boundary conditions for a successful application of the proposed method in a real application are formulated. 相似文献
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压力容器无损检测--多层包扎与带内衬压力容器的无损检测技术 总被引:3,自引:1,他引:3
多层包扎压力容器是存储高压氢气和氮气的常用压力容器之一,应用于石油、化工等行业;带内衬压力容器主要用作石油炼制工业中的再生器,是炼油装置的关键设备。综述了两种压力容器在制造和使用过程中的不同阶段可能出现的缺陷和分别采用的无损检测方法及特点,方法包括射线、超声、磁粉、渗透、红外及声发射检测等。 相似文献
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压力容器无损检测--球形储罐的无损检测技术 总被引:3,自引:1,他引:3
球形储罐是储存各种气体和液化气体的常用压力容器之一,在石油、化工、冶金和城市燃气供应等方面得到广泛使用。综述了球形储罐在制造、安装和使用过程中不同阶段可能出现的缺陷和分别采用的各种无损检测方法,包括射线检测、超声检测、磁粉检测、渗透检测、电磁涡流检测、声发射检测和磁记忆检测等技术。分别介绍了这些无损检测方法的特点。 相似文献