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Scientia Silvae Sinicae ›› 2023, Vol. 59 ›› Issue (7): 145-154.doi: 10.11707/j.1001-7488.LYKX20210727

• Reviews • Previous Articles    

Research Development of Shrinkage and Swelling of Wood with Multi-Scale Structures

Fangyu Yin,Bai Ouyang,Jiali Jiang*,Zhu Li,Jianxiong Lü   

  1. Key Laboratory of Wood Science and Technology of National Forestry and Grassland Administration Research Institute of Wood Industry, CAF Beijing 100091
  • Received:2021-09-27 Online:2023-07-25 Published:2023-09-08
  • Contact: Jiali Jiang

Abstract:

Shrinkage and swelling of wood are critical characteristics that impact its processing and utilization. This is closely link to the dimensions and stability of wood products. The complexities of shrinkage and swelling are closely correlated with the multi-scale hierarchical structure of wood, varying from macro- to micro-scales. The shrinkage and swelling behavior of wood is investigated across macro-, meso-, and micro-scales to establish an organic relationship between them. This contributes significantly to a better understanding of the occurrence and evolution mechanism and has important theoretical and practical implications for in-depth comprehension of wood properties and its rational utilization. In this paper, the wood shrinkage/swelling behavior and its hysteresis phenomena under macroscopic scale (clear wood sample), mesoscopic scale (growth ring) and microscopic scale (wood cells) were reviewed. This paper summarized the occurrence and evolution of the shrinkage and swelling behavior of wood at three scales, as well as the test methods and technical means employed to measure these phenomena in wood with multi-scale structures. Meanwhile, some suggestions for future research about the shrinkage and swelling behavior of wood with multi-scale structures are proposed: 1) To conduct a systematic investigation into the shrinkage and swelling behavior of softwood and hardwood at the meso- and micro-scales, utilizing growth rings and wood cells, in order to establish the structure-activity relationship between multi-scale structures and their shrinkage and swelling performance. 2) To reveal the differential responsive law and interaction mechanisms of the shrinkage/swelling behavior of wood induced by anisotropy, heterogeneity, and the diversity of cell types. 3) To illuminate the time hysteresis and strain hysteresis phenomena of the shrinkage and swelling behavior. 4) To introduce the related theoretical models, such as the application of finite element method, with the aims to build a visual element finite of the free shrinkage and swelling of wood with multi-scale structures.

Key words: wood, multi-scale structures, shrinkage and swelling, hysteresis phenomena

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