A method for measuring the three-dimensional spatial distribution of magnetically induced strain inside a material

Abstract

The invention provides a method for measuring magnetostrictivemagnetoelastic strain three-dimensional space distribution in a material. The method is characterized in that the change of all crystal faces of a sample in all space direction ranges before and after loading of a magnetic field is measured by the diffraction experiment geometric layout which is formed by a neutron light source, an angle measuring table and a detector, so as to realize the non-contact type accurate measuring of the magnetostrictivemagnetoelastic strain distribution in any direction; the incident beam of the neutron light source, the angle measuring table, a sample, an emergent beam and the center of the detector are positioned on the same horizontal height; the special space direction of the sample is adjusted through the self-revolving and rotation of the angle measuring table, and all crystal faces of the sample in the direction are measured; the weight quota and the magnetostrictivemagnetoelastic strain contribution of the distribution orientation of each crystal face are respectively obtained, and are weighted and multiplied, so as to obtain the magnetostrictivemagnetoelastic strain value in any space direction. The method is suitable for measuring the magnetostrictivemagnetoelastic strain of a soft magnetic intelligent material with the strong magnetic elasticity property, and is analogically suitable for measuring the space distribution of other physical field-induced strains, such as the electricstrictive strain of the piezoelectric type intelligent material.

Description

technical field [0001] The invention belongs to the technical field of material physical performance analysis and detection, and in particular relates to a method for measuring the three-dimensional spatial distribution of magnetically induced strain inside a material. Background technique [0002] Magnetoelastic materials that generate stress and strain by magnetic actuation are an important class of smart materials. As one of the candidate materials for core components such as high-efficiency transducers, large-load actuators, and high-precision sensors, it is widely used in high-tech fields such as national defense, aerospace, ocean engineering, precision machining, and automatic control. Therefore, this new type of smart material has attracted worldwide attention, and many countries have invested a lot of technical force in the research and development of materials and devices. Material performance testing is an important basis for mastering the functional behavior of m...

AI Technical Summary

Problems solved by technology

Under the technical background of existing magneto-induced strain measurement methods, such as limited measurement direction, susceptible to the influence of sample surface state and measurement environment, etc., it is necessary to realize a reliable and accurate measurement method for the three-dimensional distribution of magneto-induced strain inside the material. Basic prerequisites for a full understanding of material properties

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