A device and method for measuring linear thermal expansion coefficient

Abstract

The invention relates to a method and a device for measuring and calculating a linear thermal expansion coefficient. The method comprises the following steps: providing a measurement and calculation device, wherein the measurement and calculation device comprises a thermostat, a bearing tray, a positioning piece, a measurement instrument and a reading meter; a positioning area for positioning a test piece is formed in the bearing tray, the positioning piece and the measurement instrument are respectively positioned on one side of the positioning area, the reading meter is arranged on the thermostat and is electrically connected with the measurement instrument, and the measurement instrument comprises an instrument body and a measurement dial which can slide relative to the instrument body; arranging the bearing tray and the test piece in the thermostat, so that the test piece is positioned in the positioning area, and two sides of the positioning area are respectively contacted with the positioning piece and the measurement dial of the measurement instrument; keeping temperature of the thermostat to be T1, and recording detection data as L1 after the reading of the reading meter is stable; raising the temperature of the thermostat to be T2 and keeping the temperature, and recording the detection data as L2 after the reading of the reading meter is stable; calculating the linear thermal expansion coefficient according to a formula of (L2-L1) / (L1*DeltaT). According to the method, the measurement is accurate, and influence of human factors on the measurement result can be avoided.

Description

technical field [0001] The invention relates to a device and method for measuring linear thermal expansion coefficient, in particular to a device and method for measuring linear thermal expansion coefficient of PVC plastic floor tiles. Background technique [0002] Thermal expansion refers to the expansion and contraction of the volume or length of an object as the temperature changes, and its ability to change is represented by the length change caused by unit temperature change under constant pressure, that is, the thermal expansion coefficient. Thermal expansion coefficient is one of the main physical properties of materials, and it is a very critical data in material selection and structural design. [0003] There are two types of thermal expansion coefficient β and linear expansion coefficient α, where the linear expansion coefficient α=ΔL / (L*ΔT), where ΔL is the change in the length of the object under a given temperature change ΔT, and L is the initial length. [000...

AI Technical Summary

Problems solved by technology

[0005] At present, the existing method for calculating the linear thermal expansion coefficient is generally to heat the object to be measured in a constant temperature box until the constant temperature is stable, and then take out the object to be measured to measure the size of the object to be measured at this temperature; Put the object to be tested into the constant temperature box and heat it up to another temperature, then take out the object to be tested and measure the size of the object to be tested at this temperature, and then the coefficient of linear expansion can be calculated, but this is due to the fact that the object to be tested is taken out In the way of measurement, the temperature of the object to be measured will change during the process of taking it out, and the measured length and dimension will also change, which will eventually affect the measurement accuracy of the linear expansion coefficient of the object to be measured

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