摘要：磁记忆检测技术是一种无损检测技术，它的原理是铁磁性材料的力磁效应，通过测量试件表面漏磁场的变化，来反应试件内部应力状况，主要作用是事先检测出铁磁材料有无应力集中，以防止材料因为应力集中导致损伤，这样在了解材料内部应力有无集中的时候就可以避免材料失效引发的事故。本文中实验材料和仿真模型定义的材料为25Cemo4，在实验室内使用万能微机控制机对其进行拉伸实验，然后利用磁记忆检测仪采集磁记忆信号数据。使用ANSYS仿真分析试件在载荷下试件内部应力的集中现象。进行磁记忆检测后，分析不同应力对表面漏磁场的影响。仿真试验结果表明，试件由于应力的作用在试件表面的漏磁场发生了变化，磁信号达到了一个的数值。这个峰值代表加载后试样的应力集中的最大区域。当负载在塑性阶段，磁信号的峰值曲线的拐点，绝对值的峰值下降，这一现象表明，应力集中的程度接近试件允许的临界值，试件已经到达被破坏或失效的地步。 79575

毕业论文关键词：应力集中；仿真分析；磁记忆检测；力-磁效应；峰值

Analysis of Influence of Stress Magnetization Effect of Metal Magnetic Memory Method Testing Technique

Abstract: Magnetic memory detection technology is a non-destructive testing technology, which is the principle of ferromagnetic magnetic force effect, by measuring the surface of the specimen leakage magnetic field changes to reflect the internal stress of the specimen, the main role is to detect ferromagnetic material Whether the stress concentration, to prevent the material due to stress concentration caused by damage, so that the internal stress in the material whether the concentration of time to avoid the failure of material caused by the accident。 In this paper, the experimental material and simulation model defined material 25Cemo4, in the laboratory using universal computer control machine for its tensile experiments, and then use magnetic memory detector to collect magnetic memory signal data。 Using ANSYS Simulation to Analyze the Concentration of Internal Stress of Test Specimen under Load。 After the magnetic memory test, the influence of different stress on the surface leakage magnetic field was analyzed。 The simulation results show that the magnetic field of the specimen changes with the magnetic field of the specimen due to the stress。 This peak represents the maximum concentration of the stress concentration of the loaded specimen。 When the load is in the plastic phase, the peak value of the peak curve of the magnetic signal decreases, and the peak value of the absolute value decreases。 This indicates that the stress concentration is close to the allowable critical value of the specimen, and the specimen has reached the point of being destroyed or failed。

Key words: Stress concentration; simulation analysis; magnetic memory detection; force - magnetic effect

目录

1绪论 1

1。1 选题的目的和意义 1

1。2 国内外磁记忆检测技术研究现状 2

1。2。1 国外研究现状 2

1。2。2 国内研究现状 3

1。3 发展趋势 4

1。4 本论文的研究内容 5

2铁磁性材料的基础理论 6

2。1 铁磁材料的磁学特性 6