低真空管道结构温度应力模拟实验研究

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Abstract Research purposes:The high speed operation of maglev train can cause temperature increment of low vacuum pipe, which makes the temperature stress become an assignable structure load. So it is necessary to carry out experiment about structure temperature stress to determine the feasibility of the structure. At the same time, the temperature stress analysis method also needs to be studied based on the small size resistance strain gauge. In this paper, the test platform of low vacuum model pipeline structure was set up for the experimental study, and the temperature stress analysis method was discussed based on the data directly observed by resistance strain gauge.
Research conclusions:(1)The actual deformation of measured structure, thermal expansion coefficient and temperature coefficient of resistance strain gauge codetermine the resistance strain gauge reading under temperature load.(2)When the temperature of pipe inner wall is above 50 ℃, the constraining force around the outer wall circumference are in strong-weak cycles. When the inner wall temperature reaches 60 ℃, the temperature tensile stress reaches about 5 MPa, which needs to be pay more attention to.(3)The strain correction formula and the stress calculation formula can provide the basis for the temperature stress analysis based on the strain gauge observation data. (4)The experimental results can provide reference for pipe selection and temperature control of low vacuum pipeline transportation system.

Key words： low vacuum pipeline structure temperature stress model experiment resistance strain gauge

Received: 14 April 2020

PACS:

U455.3

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	LV Qianqian

Cite this article:

LV Qianqian. Model Experimental Research on the Temperature Stress of Low Vacuum Pipeline Structure[J]. Journal of Railway Engineering Society, 2022, 39(1): 18-24.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I1/18

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