摘要
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。
Magnetostrictive transducer for the use of defect detection in stainless steel helical bellows has been developed. The finite element models of magnetic field distribution law have been calculated using commercial package Comsol Multiphysics firstly and the results confirm that magnetic field intensity can be increased observably after setting the ferromagnetic material. An artificial defect of circumferential crack has been identified by the improved transducer with wrapping nickel alloys. The uncertainty synthesis formula has been derived and standard uncertainty of measurement result has been calculated. The results have been providing a theoretical basis for nondestructive evaluation in stainless steel helical bellows using magnetostrictive transducer.
出处
《声学学报》
EI
CSCD
北大核心
2014年第2期251-256,共6页
Acta Acustica
基金
国家自然科学基金重点项目(11132002)
国家自然科学基金(10972014)
北京市教委项目(YB20091000502
PHR200906105)资助
