A method for detecting specific heat capacity of solids based on mechanical means

Abstract

A method for detecting the specific heat capacity of a solid based on mechanical means, comprising the following steps: step 100, consulting the elastic limit of the solid material to be tested, and obtaining the elastic limit of the solid material to be tested if it cannot be found; step 200, obtaining the elastic limit of the solid material to be tested density ρ; step 300, obtain the thermal expansion coefficient α of the solid material; step 400, get the solid material to be tested and make a test piece of a certain shape, design a high-frequency tensile experiment within the elastic limit of the solid material to be tested, and Under near-adiabatic conditions, apply periodic tensile forces of different load amplitudes to the solid material to be tested, and record the temperature change of the test specimen during periodic cycles of different load amplitudes; step 500, use the free energy of deformation to derive the specific heat capacity at constant volume The expression of , the uniaxial stress measured in the above steps, temperature T, T 0 , Density ρ and coefficient of thermal expansion α are brought into the expression of specific heat capacity at constant volume, calculated and processed to obtain the specific heat capacity at constant volume of the material to be measured.

Description

Technical field [0001] The present invention relates to the field of physical properties detection of solid material, and more particularly to a method of detecting a solid-specific heat capacity based on mechanical means. Background technique [0002] With the vigorous development of materials research and development, various new solid materials are constantly emerging. The performance parameters of these materials greatly affect their practical applications. How to accurately, the economy, and quickly determine the various parameters of the materials, it is urgent to solve problems. In many parameters, the specific heat capacity of solid materials has important significance for scientific research and engineering applications. [0003] At present, the proposed method of determination of solid material is mainly compared with heat capacity, including mixing, cooling, electric heating method, and the like. In several common measurement than the above-mentioned common measurement...

AI Technical Summary

Problems solved by technology

In the above several common methods of measuring specific heat capacity, the accuracy of the experimental results is low due to the difficulty in controlling the heat dissipation factor and the measurement results are largely affected by the heat transfer of the calorimeter

Although the follow-up improvement plan proposes that the error can be reduced by replacing the calorimeter with a sensor, improving the heat insulation device, or designing a compensation and feedback mechanism, the overall idea of ​​the plan is still to measure the heat transfer and heat capacity of two objects, so A variety of heat dissipation factors still have an irreversible impact on the accuracy of the results

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