Study on the Drying Strain of Cross-Section of <italic style="font-style: italic">Quercus mongolica</italic> Lumber Based on DIC Technique

Yun-jia DUAN; Hao LU; Ying-chun CAI; Cheng QIAN; Hong-xu MENG; Zheng-min JIN; Jing-yao ZHAO

doi:10.12326/j.2096-9694.2021167

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Study on the Drying Strain of Cross-Section of Quercus mongolica Lumber Based on DIC Technique
1.Key Laboratory of Bio-based Material Science & Technology（Northeast Forestry University）， Ministry of Education，Harbin 150040，Heilongjiang，China
Vol. 36, Issue 3, Pages: 58-64(2022)
DOI： 10.12326/j.2096-9694.2021167

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段云佳,卢昊,蔡英春等.基于数字图像相关技术的蒙古栎锯材干燥端面应变规律研究[J].木材科学与技术,2022,36(03):58-64.

DUAN Yun-jia,LU Hao,CAI Ying-chun,et al.Study on the Drying Strain of Cross-Section of Quercus mongolica Lumber Based on DIC Technique[J].Chinese Journal of Wood Science and Technology,2022,36(03):58-64.
段云佳,卢昊,蔡英春等.基于数字图像相关技术的蒙古栎锯材干燥端面应变规律研究[J].木材科学与技术,2022,36(03):58-64. DOI： 10.12326/j.2096-9694.2021167.

DUAN Yun-jia,LU Hao,CAI Ying-chun,et al.Study on the Drying Strain of Cross-Section of Quercus mongolica Lumber Based on DIC Technique[J].Chinese Journal of Wood Science and Technology,2022,36(03):58-64. DOI： 10.12326/j.2096-9694.2021167.

摘要

以20 mm厚蒙古栎锯材为研究对象，采用数字图像相关（digital image correlation，DIC）技术实时监测其端面干燥过程中宽度（弦向）、厚度（径向）方向应变的分布，并分析干燥温度对宽度、厚度方向应变的影响。结果表明：在相同含水率的条件下，随着干燥温度的升高，沿厚度与宽度方向各层应变增大。中间与两侧部位之间应变差值，在40 ℃时为0.042，80 ℃时提高到0.059。锯材厚度方向应变数值增长趋势均相近，因此得出锯材干缩异向性的差异主要来自于锯材的宽度方向；40 ℃下锯材的干缩异向性数值大于80 ℃时的干缩异向性数值。DIC技术是非接触式检测木材干燥应变的有效手段，形变分布与传统检测手段结果相符，同时还可将干燥形变过程可视化。

Abstract

To analyze the stress-strain law and shrinkage difference during the drying process, the strain profile of 20 mm thick ,Quercus mongolica, lumber along the width and thickness directions was monitored respectively by the digital image correlation (DIC) technique. This research analyzed the difference of drying strains in width and thickness directions and the effect of the temperature. The results indicated that the DIC was an effective non-contacted method of detecting the drying strain in wood. The DIC can visualize the drying deformation process while the results obtained by DIC was consistent with those of traditional detection methods. Meanwhile, under the condition of the same moisture content, the strain of each layer along the thickness and width directions increased progressively as the temperature increased. At the temperature of 80 °C, the difference of strain between the middle position and both sides were 0.059; whereas at the temperature of 40 °C, the difference decreased to 0.042. The strain values and trends along the thickness direction of ,Quercus mongolica, lumber were similar with those along the width direction. The wood shrinkage anisotropy was mainly derived from the width direction. Meanwhile, the value of wood shrinkage anisotropy was greater at 40 ℃ than at 80 ℃.

关键词

干燥应变数字图像相关技术含水率分布

Keywords

drying straindigital image correlation(DIC) techniquesmoisture content distribution

references

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Study on Features of the Strains in Some Southern Hardwoods during the First Drying Stage

Study on the Drying Strain of Cross-Section of Quercus mongolica Lumber Based on DIC Technique

DOI： 10.12326/j.2096-9694.2021167

摘要

Abstract

关键词

Keywords

references