Method for measuring Poisson's ratio of solid material through ultrasonic waves

Abstract

The invention provides a method for measuring a Poisson's ratio of a solid material through ultrasonic waves. A device for implementing the method comprises an ultrasonic measurement instrument host, a digital oscilloscope, an organic glass water tank, a water tank top plate provided with angle indexes and a rotary knob, a solid material plate and two ultrasonic probes; by means of a mode of integral connection of the water tank top plate provided with the angle indexes and the rotary knob, an angle formed by acoustic waves and a plane where a measured material is located is accurately controlled by rotating a direction of the assembly, and an angle of incidence is recorded during total reflection of longitudinal waves and transverse waves, so that the Poisson's ratio of the measured material is calculated. The solid material plate is connected with the water tank top plate provided with the angle indexes and the rotary knob, and the ultrasonic waves are subjected to total reflection on the surface of the solid material. According to the method, the experiment content is abundant, an application range is wide, not only can important physical parameters such as the Poisson's ratio of different materials and the like be measured through designed experiments, but also physical parameters such as sound velocity, Young modulus and the like in media can be measured, and the device can be taken as teaching apparatus for physical experiments of colleges and universities.

Description

technical field [0001] The invention relates to a method for measuring the Poisson's ratio of solid materials by using ultrasonic waves, which belongs to the field of detection of solid properties and is also applicable to the field of physics experiment teaching in colleges and universities. Background technique [0002] Ultrasonic refers to the frequency at 2×10 4 Hz~2×10 12 Hz sound waves can effectively propagate in media such as gases, liquids, solids, and solid solutions. It plays a unique role in marine exploration and development, non-destructive testing and evaluation, medical diagnosis and other fields. Therefore, the study of ultrasound is of great significance. [0003] Poisson's ratio is a very important material mechanics parameter. Currently, there are two types of testing methods for Poisson's ratio: contact and non-contact. The former mainly includes mechanical method and electrical measurement method. In the mechanical method, the self-weight and clamp...

AI Technical Summary

Problems solved by technology

The former mainly includes mechanical method and electrical measurement method. In the mechanical method, the self-weight and clamping force of the extensometer are large, which will cause additional deformation of the soft sample, so it is only suitable for hard test pieces.

The electrical measurement method pastes the moiré sheet or the resistance sheet on the test piece to add the stiffness of the paste sheet to the test piece, the measurement error is large, and the measurement range is limited, one-time use, and the cost is high

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