周向磁巴克豪森噪声分布及平面应力测量

磁巴克豪森噪声对应力非常敏感,是一种操作便捷、检测灵敏度高、重复性好的原位无损应力测量技术,在残余应力测定、零部件应力集中区评价、结构承载应力评估中有广阔的应用前景。工程中铁磁性材料表面平面应力测量时最大主应力及其方向测量是一项亟待解决的难题,提出了一种基于周向磁巴克豪森噪声分布的平面应力测量方法,建立了求解平面应力张量的模型,实现了测量点任意方向的正应力和剪应力解调。实验验证了该方法的有效性,测量结果表明,当主应力大于50 MPa时,实测的最大主应力方向偏差为10°,最大正应力偏差为5 MPa,最大剪应力偏差为6 MPa,具有较高的测量准确度。

Circumferential magnetic Barkhausen noise distributionand plane stress measurement

Magnetie Barkhausen noise is sensitive to stress, which is an in-situ non-destructive stress measurement technology withconvenient operation, high detection sensitivity and good repeatability. It has broad application prospect in residlual stress measurement,stress concentration zone evaluation of parts and bearing stress evaluation of struetures. The measurement of the maximum prineipal stressand its diretion during the measurement of the plane stress on the surface of ferromagnetic materials in engineering is an urgent problemto he solved. Proposes a plane stress measurement method based on the cireumferential magnetic Barkhausen noise distribution, andestablishes the solution of the plane stress tensor. The model realizes the demodulation of normal stress and shear stress in any direetionof the measuring point. Experiments have verified the effectiveness of this method. Measurement resulis show that when the principalstress is greater than 50 MPa, the measured maximum prineipal stress direction deviation is 10°, the maximum normal stress deviation is5 MPa and the maximum shear stress deviation is 6 MPa, which has high measurement accuracy