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Effect of bamboo nodes on crack generation of round bamboo and bamboo-based composites during drying

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Abstract

Cracking of bamboo results in structural failure, safety issues, resources waste, and economy loss. The influence of nodes on the cracking behavior of bamboo still remains unclear. In this study, cracks in bamboo were classified into three types (end cracking, node cracking, and internode cracking), and the node cracking mechanism was clarified. The results revealed that 72%, 77%, and 89% of the cracks in the middle portion of the samples were generated at the node positions for the round bamboo, laminated bamboo lumber, and flattened bamboo board, respectively, indicating that much more cracks were generated in the nodes than in the internodes during drying process. The reason was the greater tangential shrinkage of bamboo nodes. The thickening and deflection of vascular bundles in nodes caused a higher fiber content and substance density, and thus resulted in greater shrinkage. This study confirmed that bamboo node played a dominant role in the crack generation in both bamboo and bamboo-based composites. The results in this study provided fundamental information for understanding the cracking behavior of bamboo and developing anti-cracking techniques for bamboo.

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Acknowledgements

We would like to thank the National Natural Science Foundation of China (No. 32201639), the National Natural Science Foundation of Sichuan Province, China (No. 2023NSFSC5841, 2022NSFSC1034), the Research and Application of Primary Color Protection Technology of Bamboo in Yibin (No. 2021YLZ003), and the Dual-plan of Discipline Construction in Sichuan Agricultural University for their financial support for this research.

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Authors and Affiliations

  1. College of Forestry, Sichuan Agricultural University, 611130, Chengdu, Sichuan, P.R. China

    Qi Chen, Yingyue He, Yongze Jiang, Jinqiu Qi, Shaobo Zhang, Xingyan Huang, Yuzhu Chen, Hui Xiao, Shanshan Jia & Jiulong Xie

  2. Wood Industry and Furniture Engineering Key Laboratory of Sichuan Provincial Department of Education, 611130, Chengdu, Sichuan, P.R. China

    Qi Chen, Yingyue He, Yongze Jiang, Jinqiu Qi, Shaobo Zhang, Xingyan Huang, Yuzhu Chen, Hui Xiao, Shanshan Jia & Jiulong Xie

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  1. Qi Chen
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  2. Yingyue He
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  10. Jiulong Xie
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Contributions

Qi Chen and Yingyue He contributed equally to this work. Qi Chen: Experiment, Formal analysis, Writing - original draft. Yingyue He: Experiment, Formal analysis. Yongze Jiang: Methodology, Resources. Jinqiu Qi: Resources. Shaobo Zhang: Methodology, Resources. Xingyan Huang: Methodology. Yuzhu Chen: Methodology, pictures. Hui Xiao: Software, review. Shanshan Jia: Methodology, Writing - review & editing, Conceptualization. Jiulong Xie: Conceptualization, Funding acquisition, Project administration.

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Correspondence to Shanshan Jia or Jiulong Xie.

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Chen, Q., He, Y., Jiang, Y. et al. Effect of bamboo nodes on crack generation of round bamboo and bamboo-based composites during drying. Eur. J. Wood Prod. 81, 1201–1210 (2023). https://doi.org/10.1007/s00107-023-01942-7

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  • DOI: https://doi.org/10.1007/s00107-023-01942-7

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