Abstract
It is difficult to measure elastic modulus simply and accurately in the testing of mechanical properties of materials. Combined with static tensile method, this paper presents a method for measuring elastic modulus of materials based on air-coupled ultrasonic nondestructive testing. Firstly, the 1–3 piezoelectric composite material and the matching material of low acoustic impedance are self-made, and 400 kHz air-coupled ultrasonic transducer is fabricated. Then, the performance of the transducer is tested, and the insertion loss and bandwidth of −6 dB are −33.5 dB and 23.4%, respectively. Compared with the traditional instrument for measuring elastic modulus, the measurement of elastic modulus of carbon steel rod material is realized in this paper, and the measured results are in agreement with the accepted value. In addition, from the angle of relative uncertainty, how to reduce the measurement error by improving the device is analyzed. It can be shown that the method has high linearity, high symmetry, and good stability and repeatability. This paper provides a new way for the selection and design of measuring instrument components.
Highlights
Within the elastic limit, the stress and strain of an elastic body become directly proportional, and its ratio is called elastic modulus, known as Young’s modulus or tensile modulus
No matter studying the static or dynamic characteristics of mechanical components [1], the measurement of elastic modulus is of great significance for studying the mechanical properties, state and life of materials [2,3]
Piezoelectric ultrasonic transducer is a kind of device which realizes the conversion of electrical energy and mechanical energy based on the piezoelectric effect and inverse piezoelectric effect of piezoelectric materials
Summary
The stress and strain of an elastic body become directly proportional, and its ratio is called elastic modulus, known as Young’s modulus or tensile modulus. Elastic modulus indicates the ability of solid material to resist deformation. The elastic modulus of materials plays an important role in the application, modification and microstructure study of materials. No matter studying the static or dynamic characteristics of mechanical components [1], the measurement of elastic modulus is of great significance for studying the mechanical properties, state and life of materials [2,3]. The size of elastic modulus is related to the type of material, temperature and other factors [4]. With the continuous progress of technology, all kinds of machinery and precision instruments have higher and higher requirements for the mechanical properties of materials, which put forward higher requirements for accurately measuring the elastic modulus of different materials in different application environments
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