Selected Metrological Aspects in Truss Magnetoelastic Measurements

This work presents the determination of the unbiased estimation of the standard deviation and magnetoelastic sensitivity for magnetoelastic measurements. The investigation was performed on trusses made of 13CrMo4-5 and X30Cr13 steel. Three central truss elements were designed as test samples constituting the tested magnetic circuit. Thirty interchangeable test samples were made to measure five sets for both materials. Based on the obtained characteristics, the unbiased estimation of the standard deviation and magnetoelastic sensitivity were determined. The percentages of the estimator indicate very low uncertainty in the assessment of stresses in the structure. High magnetoelastic sensitivity values indicate the possibility of using the developed method to assess the stress state in ferromagnetic structural elements.