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Method and system for testing linear expansion coefficient of wooden cultural relics with static thermomechanical analyzer

A technology of thermomechanical analyzer and expansion coefficient, applied in the field of analysis and testing, to achieve the effects of high data accuracy, good repeatability, and high displacement sensitivity

Active Publication Date: 2022-04-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is expected to use static thermomechanical analysis to test the linear expansion coefficient of wooden cultural relics, but there are no patents or literature reports on related methods.

Method used

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  • Method and system for testing linear expansion coefficient of wooden cultural relics with static thermomechanical analyzer
  • Method and system for testing linear expansion coefficient of wooden cultural relics with static thermomechanical analyzer
  • Method and system for testing linear expansion coefficient of wooden cultural relics with static thermomechanical analyzer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The average linear expansion coefficient of the "Nanhai No. 1" shipwreck slab sample at -10°C to 50°C was tested by the thermomechanical analysis method described in the present invention. It was identified that the wood species was hardwood pine, which was severely degraded and had a maximum moisture content. is 242.77%. The sample was cut into small cuboid test pieces, and the initial lengths measured in the axial direction, radial direction and chord direction were 4.141mm, 4.605mm and 6.722mm respectively after drying and grinding. like Figure 2-3 As shown, the accessories for the volume expansion of the static thermomechanical analyzer include a compression probe and a compression fixture base. Place the sample on the compression fixture base and close the sample furnace to start the test. The built-in temperature control component and the external cooler Control the temperature change, provide the load by the compression probe and record the displacement change,...

Embodiment 2

[0054] The average linear expansion coefficient of the "Nanhai No. 1" wooden component sample at -10°C to 50°C was tested by the thermomechanical analysis method described in the present invention. It was identified that the wood species was cypress, which was moderately degraded, and the maximum moisture content was 315.73%. The sample was cut into small cuboid test pieces, and after drying and grinding, the initial lengths measured in the axial direction, radial direction and chord direction were 6.064mm, 4.743mm and 3.462mm respectively. Place the sample on the base of the compression fixture and start the test, set the constant load to 50mN, set the test temperature range to -40°C to 70°C, control the temperature to rise at a rate of 5°C / min, and record the curve of deformation versus temperature. The deformation-temperature curve obtained from the test is processed in the data processing software of the static thermomechanical analyzer, and the three-dimensional average l...

Embodiment 3

[0056] The average linear expansion coefficient of the "Nanhai No. 1" shipwood sample at -10°C to 50°C was tested by the thermomechanical analysis method described in the present invention. It was identified that the wood species was sweetgum, which was severely degraded, and the maximum moisture content was 511.42 %. The sample was cut into small cuboid test pieces, and the initial lengths measured in the axial direction, radial direction and chord direction were 3.635mm, 4.789mm and 2.473mm respectively after drying and grinding. Place the sample on the base of the compression fixture and start the test, set the constant load to 50mN, set the test temperature range to -40°C to 70°C, control the temperature to rise at a rate of 5°C / min, and record the curve of deformation versus temperature. The deformation-temperature curve obtained from the test was processed in the data processing software of the static thermomechanical analyzer, and the three-dimensional average linear ex...

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Abstract

The invention discloses a method and system for testing the linear expansion coefficient of wooden cultural relics with a static thermomechanical analyzer, belonging to the field of analysis and testing techniques. The method comprises: cutting out a wooden cultural relic sample from the wooden cultural relic and drying it, processing and smoothing the surface of the dried wooden cultural relic sample; placing the wooden cultural relic sample on a static thermomechanical analyzer and fixing it, measuring and recording The initial sample length on the test direction; set the heating program of the static thermomechanical analyzer and start the experiment, record the curve of the deformation of the wooden cultural relic sample with temperature; process the test in the static thermomechanical analyzer data analysis software to obtain The curve of deformation changing with temperature is used to calculate the average coefficient of linear expansion of the wooden cultural relic in this temperature range. This method is used to test the coefficient of linear expansion of wooden cultural relics, and is suitable for evaluating the dimensional stability of slightly, moderately and severely degraded wooden cultural relics under temperature changes.

Description

technical field [0001] The invention belongs to the field of analysis and testing technology methods, and in particular relates to a method and system for testing the linear expansion coefficient of wooden cultural relics by using a static thermomechanical analyzer. Background technique [0002] Wooden cultural relics are usually buried in the underground environment or underwater environment for a long time. After archaeological excavation, the size of wooden cultural relics will be unstable. The natural anisotropy of wood results in different dimensional changes in the axial, radial, and chord directions. The mismatch of linear expansion coefficients in the three directions can easily cause deformation and distortion of wooden cultural relics and increase safety risks. Wooden cultural relics degrade non-uniformly during the burial process, and their physical and chemical properties change greatly compared with modern healthy wood, and the law of linear expansion is differe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/16
CPCG01N25/16
Inventor 韩向娜韩刘杨秦振芳吴梦若黄琦钧
Owner UNIV OF SCI & TECH BEIJING
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