基于磁导率检测技术的应力集中和疲劳损伤检测

发布时间：2018-01-17 02:17

本文关键词：基于磁导率检测技术的应力集中和疲劳损伤检测　出处：《钢铁研究学报》2017年07期 　论文类型：期刊论文

【摘要】：磁导率检测技术是依据探头闭合磁路中感应电压与磁通量的变化率成正比的电磁感应原理来检测试件磁导率变化的评价方法。此种方法高精度检测构件某区域与磁导率相关的各种变化,如应力集中、疲劳损伤、老化蜕变等。从磁路欧姆定律出发,推导分析了检测方法和检测原理。以Q235钢和45号钢为例,从试验上研究了检测信号随拉应力、拉力残余应力和疲劳损伤程度的变化关系。试验发现,依据磁导率检测技术,可有效测量铁磁材料试件所处的应力状态,判断构件曾经受过的最大应力。依据应力作用后的残余应力,测量构件曾经受过的最大应力具有更高的检测灵敏度。试验结果表明,对疲劳损伤的检测灵敏度低于对应力集中的检测灵敏度;对低碳钢Q235的疲劳损伤检测灵敏度大于对中碳钢45号钢的检测灵敏度。
[Abstract]:The permeability measurement technique is based on the principle of electromagnetic induction that the inductive voltage in the closed magnetic circuit of the probe is proportional to the change rate of magnetic flux to detect the change of the permeability of the specimen. A variety of changes in permeability. For example, stress concentration, fatigue damage, aging and disintegration. Based on the Ohm law of magnetic circuit, the detection method and principle are deduced and analyzed. The Q235 and 45 steel are taken as examples. The relationship between testing signal and tensile stress, residual stress of tensile force and fatigue damage degree is studied experimentally. It is found that the stress state of ferromagnetic material specimen can be effectively measured according to permeability detection technology. According to the residual stress after the stress, the measurement of the maximum stress has higher detection sensitivity. The test results show that. The sensitivity of fatigue damage detection is lower than that of stress concentration. The sensitivity of fatigue damage detection for low carbon steel Q235 is higher than that for medium carbon steel 45.
【作者单位】：南昌航空大学无损检测技术教育部重点实验室;
【基金】：国家自然科学基金资助项目(51261023)
【分类号】：TG142.15
【正文快照】： 在现代工业中,钢铁构件大量用于航空航天、铁路、电力、压力容器等行业。构件在使用过程中,由于应力、疲劳载荷、内部工作介质或外部工作环境的作用,应力腐蚀、功能老化、疲劳断裂等现象极容易产生在应力集中和疲劳损伤区域,造成重大恶性事故,最终给国家和人民带来灾难[1-2]。

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