Measuring the Damping Performance of Gradient-Structured Bamboo Using the Resonance Method
Bamboo has natural damping properties, but, due to the obvious gradient differences in bamboo walls, the damping properties of different layers may vary. Using bamboo slivers as the research object, this study investigated the underlying mechanism of the effect of microstructural and chemical compon...
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| Format: | Article |
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MDPI AG
2021-11-01
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| Series: | Forests |
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| Online Access: | https://www.mdpi.com/1999-4907/12/12/1654 |
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| author | Xiaoyi Chen Liping Deng Xin Wei Mingpeng Li Ge Wang Fuming Chen |
| author_facet | Xiaoyi Chen Liping Deng Xin Wei Mingpeng Li Ge Wang Fuming Chen |
| author_sort | Xiaoyi Chen |
| collection | DOAJ |
| description | Bamboo has natural damping properties, but, due to the obvious gradient differences in bamboo walls, the damping properties of different layers may vary. Using bamboo slivers as the research object, this study investigated the underlying mechanism of the effect of microstructural and chemical components on the damping properties (η, damping ratio) of bamboo using the resonance and nonresonance methods. The damping ratio decreased on <i>L</i><sub>3</sub> (inner layer), <i>L</i><sub>2</sub> (middle layer), and <i>L</i><sub>1</sub> (outer layer) due to lower microfibril angles, increased crystallinity of cellulose, and decreased hemicellulose content. All of these limited the motion of the bamboo’s molecular chains. The damping ratio successively increased in the oven-dried, air-dried, and water saturated states because water acted as a plasticizer. The damping ratio of <i>L</i><sub>1</sub>, in the oven-dried state, was slightly higher than that of the air-dried state because <i>L</i><sub>1</sub> had the lowest water content. This allowed less water to escape during drying, which intensified the molecular distortion. The initial tan δ (tangent of the loss angle) decreased successively on the <i>L</i><sub>3</sub>, <i>L</i><sub>2</sub>, and <i>L</i><sub>1</sub> layers of the bamboo, and the tan δ of <i>L</i><sub>3</sub> was lower than that of <i>L</i><sub>2</sub> due to changes in the temperature sensitivity of hemicellulose. |
| first_indexed | 2024-03-10T04:07:38Z |
| format | Article |
| id | doaj.art-d86e1ae2ea634c5e93e74ad23b462f10 |
| institution | Directory Open Access Journal |
| issn | 1999-4907 |
| language | English |
| last_indexed | 2024-03-10T04:07:38Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Forests |
| spelling | doaj.art-d86e1ae2ea634c5e93e74ad23b462f102023-11-23T08:20:31ZengMDPI AGForests1999-49072021-11-011212165410.3390/f12121654Measuring the Damping Performance of Gradient-Structured Bamboo Using the Resonance MethodXiaoyi Chen0Liping Deng1Xin Wei2Mingpeng Li3Ge Wang4Fuming Chen5International Centre for Bamboo and Rattan, Beijing 100102, ChinaInternational Centre for Bamboo and Rattan, Beijing 100102, ChinaInternational Centre for Bamboo and Rattan, Beijing 100102, ChinaInternational Centre for Bamboo and Rattan, Beijing 100102, ChinaInternational Centre for Bamboo and Rattan, Beijing 100102, ChinaNational Forestry and Grassland Administration/Beijing Co-Build Key Laboratory of Bamboo and Rattan Science Technology, Beijing 100102, ChinaBamboo has natural damping properties, but, due to the obvious gradient differences in bamboo walls, the damping properties of different layers may vary. Using bamboo slivers as the research object, this study investigated the underlying mechanism of the effect of microstructural and chemical components on the damping properties (η, damping ratio) of bamboo using the resonance and nonresonance methods. The damping ratio decreased on <i>L</i><sub>3</sub> (inner layer), <i>L</i><sub>2</sub> (middle layer), and <i>L</i><sub>1</sub> (outer layer) due to lower microfibril angles, increased crystallinity of cellulose, and decreased hemicellulose content. All of these limited the motion of the bamboo’s molecular chains. The damping ratio successively increased in the oven-dried, air-dried, and water saturated states because water acted as a plasticizer. The damping ratio of <i>L</i><sub>1</sub>, in the oven-dried state, was slightly higher than that of the air-dried state because <i>L</i><sub>1</sub> had the lowest water content. This allowed less water to escape during drying, which intensified the molecular distortion. The initial tan δ (tangent of the loss angle) decreased successively on the <i>L</i><sub>3</sub>, <i>L</i><sub>2</sub>, and <i>L</i><sub>1</sub> layers of the bamboo, and the tan δ of <i>L</i><sub>3</sub> was lower than that of <i>L</i><sub>2</sub> due to changes in the temperature sensitivity of hemicellulose.https://www.mdpi.com/1999-4907/12/12/1654damping ratioresonance methodnonresonance methodtan δspecific surface area adsorption |
| spellingShingle | Xiaoyi Chen Liping Deng Xin Wei Mingpeng Li Ge Wang Fuming Chen Measuring the Damping Performance of Gradient-Structured Bamboo Using the Resonance Method Forests damping ratio resonance method nonresonance method tan δ specific surface area adsorption |
| title | Measuring the Damping Performance of Gradient-Structured Bamboo Using the Resonance Method |
| title_full | Measuring the Damping Performance of Gradient-Structured Bamboo Using the Resonance Method |
| title_fullStr | Measuring the Damping Performance of Gradient-Structured Bamboo Using the Resonance Method |
| title_full_unstemmed | Measuring the Damping Performance of Gradient-Structured Bamboo Using the Resonance Method |
| title_short | Measuring the Damping Performance of Gradient-Structured Bamboo Using the Resonance Method |
| title_sort | measuring the damping performance of gradient structured bamboo using the resonance method |
| topic | damping ratio resonance method nonresonance method tan δ specific surface area adsorption |
| url | https://www.mdpi.com/1999-4907/12/12/1654 |
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