论文部分内容阅读
研制了一种用于不锈钢波纹管检测的磁致伸缩换能器。首先选用多物理场耦合分析软件对圆管的磁场分布规律进行有限元仿真,证实增加铁磁性条带后,磁场强度显著提高。而后通过均匀包裹一层镍合金薄带的方式,改进了磁致伸缩换能器的结构,并成功识别出环向裂纹缺陷。同时分析了试验过程中不确定度的来源,推导出了仅含有直接测量值的标准不确定度合成公式。研究结果为采用磁致伸缩换能器进行不锈钢波纹管缺陷无损评价提供了理论依据。
A magnetostrictive transducer has been developed for stainless steel bellows inspection. Firstly, multi-physics coupling analysis software was used to simulate the magnetic field distribution of circular tube. It was confirmed that the magnetic field strength increased significantly after adding ferromagnetic strip. Then the structure of the magnetostrictive transducer was improved by uniformly wrapping a layer of nickel alloy strip, and the ring crack defect was successfully identified. At the same time, the source of the uncertainty in the experiment is analyzed, and the formula of the standard uncertainty with only the direct measurement is deduced. The results provide a theoretical basis for the non-destructive evaluation of stainless steel corrugated tube by using magnetostrictive transducer.