Auxiliary measuring device and method for high-temperature dynamic elastic modulus of metal material

Abstract

The invention discloses a metal material high-temperature dynamic elastic modulus auxiliary measuring device and a metal material high-temperature dynamic elastic modulus measuring method, and particularly discloses a metal material high-temperature dynamic elastic modulus auxiliary measuring method which comprises the following steps: selecting a sample type according to the blank thickness of a metal material: designing the size of a sample; deducing a linear relation between the resonant frequency of the sample and the elastic modulus; processing the sample according to the design size, and utilizing a metal material high-temperature dynamic elastic modulus to assist the measuring device; and starting the high-frequency inductive heating equipment to heat the sample to a set temperature, obtaining a resonant frequency value of the sample at the set temperature, and carrying out back calculation according to a linear relation between the resonant frequency and the elastic modulus to obtain an elastic modulus value of the sample at the set temperature. The method has the beneficial effects that the linear relation between the resonant frequency and the elastic modulus of the metal material is deduced through sample selection and sample size design, the resonant frequency of the sample to be tested at the normal temperature and the high temperature is obtained through the ultrasonic fatigue testing machine, and the elastic modulus of the metal material is measured through the resonant frequency and the elastic modulus of the metal material at the normal temperature. The elasticity modulus of the metal material at high temperature is reversely deduced, the measured result is more accurate, the operation is simple, and the equipment cost is low.

Description

technical field [0001] The invention relates to the technical field of mechanical property testing of metal materials, in particular to a high-temperature dynamic elastic modulus measuring device and method for metal materials. Background technique [0002] The development of advanced structural materials and functional materials is changing with each passing day, and various performance evaluation indicators and evaluation techniques of materials are the basic guarantee for the safe service of materials. Elastic modulus is one of the important core mechanical performance evaluation indicators of metal materials, which mainly reflects the ability of materials to resist deformation, and is very important for material design and safe use. The elastic modulus, also known as Young's modulus, was defined by the British physicist Thomas Young in 1807. Define a wire of length L and cross-sectional area S to extend under the action of force F; the ratio of external force F to cross...

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Problems solved by technology

[0005] The above three methods have the following defects respectively: the value measured by the static method is inaccurate, the results measured many times are often different, and the repeatability of the results is very poor, generally only used for rough elastic modulus measurement; The test method and equipment are expensive. For example, the UMS-H high temperature elastic modulus measuring device in Japan costs more than 2 million RMB, and the thickness of the sample blank is high, such as figure 1 As shown, the diameter of the sample needs to be not less than 12mm, and it is impossible to measure metal materials below 12mm. In fact, the blank thickness of most metal materials is generally not greater than 12mm, so this greatly limits the scope of application of this method.

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