Investigation of Metal Magnetic Memory for Stress State Identification in Steel Components

用于钢构件应力状态识别的金属磁记忆研究

• 批准号: 524177-2018
• 负责人: Krause, Thomas
• 金额: $ 1.82万
• 依托单位: Royal Military College of Canada
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=655978
• 关键词: Investigation; Metal; Magnetic; Memory; Stress

Conventional magnetic inspection technologies require direct application of magnetizing flux to ferromagnetic components to**generate magnetic flux leakage (MFL) signals from defects or for the detection of stress. Applications of such technologies to the**inspection of large volumes of material are time consuming and costly. Magnetization techniques are also limited in the case of**inspection of irregular structures. Metal magnetic memory (MMM) method is a potential alternative inspection technology that may**be used to identify stress in steel components. For example, it can be used in pipelines, where stress concentrations arise near**pits, localized plastic deformation, or due to ground settling or slippage. The induced stresses produce conditions that may lead to**stress corrosion cracking. MMM is a passive technique that uses the magnetization of the earth's magnetic field in combination**with other potential factors to assess the stress state of the part. MMM is based on magnetoelasticity (Villari effect). It is a rapidly**expanding method for the detection of anomalies in magnetic fields at the surface or near ferromagnetic components due to local**changes in their stress state. MMM can be used to determine the location of pipe from above ground and has potential to assess**the stress state of pipe utilizing inexpensive magnetic sensor arrays. Improved technology coupled with a better understanding of**the physical basis of MMM could lead to simple monitoring capabilities and, hence, improved service life and performance of**infrastructures such as water/wastewater and gas/oil pipelines, turbines, pressure vessels, rails, welded and casting parts.**

传统的磁性检测技术需要将磁通量直接施加到铁磁部件上，以 ** 产生缺陷的漏磁（MFL）信号或检测应力。将这种技术应用于对大量材料的检查既费时又费钱。磁化技术在检查不规则结构的情况下也受到限制。金属磁记忆（MMM）方法是一种潜在的替代检测技术，可用于识别钢构件中的应力。例如，它可以用于管道，其中应力集中出现在 ** 坑附近，局部塑性变形，或由于地面沉降或滑动。诱导应力产生的条件可能导致 ** 应力腐蚀开裂。MMM是一种被动技术，它利用地球磁场的磁化强度与其他潜在因素相结合来评估零件的应力状态。MMM基于磁弹性（Villari效应）。它是一种快速扩展的方法，用于检测铁磁部件表面或附近由于应力状态局部变化而产生的磁场异常。磁记忆法可以从地面上确定管道的位置，并有可能利用廉价的磁传感器阵列来评估管道的应力状态。改进的技术加上对MMM物理基础的更好理解，可以带来简单的监测能力，从而提高 ** 基础设施的使用寿命和性能，如水/废水和天然气/石油管道，涡轮机，压力容器，轨道，焊接和铸造零件。