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The effect of structural changes on the compressive strength of LVL

(2020) WOOD SCIENCE AND TECHNOLOGY. 54(5). p.1253-1267
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Abstract
Laminated veneer lumber (LVL) is an important engineered wood product. Internal structural changes have a substantial influence on the mechanical performance of LVL. To investigate the relationship between the internal structural changes and the compressive strength, poplar LVL layering is manufactured by taking into account the veneer lathe checks, namely lathe checks both facing inwards (TLLT), lathe checks both oriented outwards (LTTL) and lathe checks in one layer facing outwards (LTLT). Macroscopic compressive strength of the samples is measured using a universal testing machine. Microscopic internal structural changes are periodically recorded with X-ray CT when the samples are compressed using a load cell. The results show that the compressive strength of LTLT is significantly higher than that of LTTL and TLLT types of LVL. During the compression test, density increase in the samples is non-homogenous. There is a minor increase in density of the glue line, while this is larger in regions with a low density. Density increase is mainly induced by collapse of large vessels. However, the presence of phenol formaldehyde resin can enhance the resistance of vessels against collapse. Structural changes, i.e., vessels collapse and collapse propagation, are likely to occur in locally heterogeneous regions. Propagation of collapsed vessels is more frequently observed in regions where large vessels are contiguous.
Keywords
Plant Science, Industrial and Manufacturing Engineering, Forestry, General Materials Science, VENEER LUMBER LVL, WOOD

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MLA
Li, Wanzhao, et al. “The Effect of Structural Changes on the Compressive Strength of LVL.” WOOD SCIENCE AND TECHNOLOGY, vol. 54, no. 5, 2020, pp. 1253–67, doi:10.1007/s00226-020-01205-1.
APA
Li, W., Zhang, Z., Zhou, G., Kibleur, P., Mei, C., Shi, J., … Van den Bulcke, J. (2020). The effect of structural changes on the compressive strength of LVL. WOOD SCIENCE AND TECHNOLOGY, 54(5), 1253–1267. https://doi.org/10.1007/s00226-020-01205-1
Chicago author-date
Li, Wanzhao, Zheng Zhang, Guoqiang Zhou, Pierre Kibleur, Changtong Mei, Jiangtao Shi, Joris Van Acker, and Jan Van den Bulcke. 2020. “The Effect of Structural Changes on the Compressive Strength of LVL.” WOOD SCIENCE AND TECHNOLOGY 54 (5): 1253–67. https://doi.org/10.1007/s00226-020-01205-1.
Chicago author-date (all authors)
Li, Wanzhao, Zheng Zhang, Guoqiang Zhou, Pierre Kibleur, Changtong Mei, Jiangtao Shi, Joris Van Acker, and Jan Van den Bulcke. 2020. “The Effect of Structural Changes on the Compressive Strength of LVL.” WOOD SCIENCE AND TECHNOLOGY 54 (5): 1253–1267. doi:10.1007/s00226-020-01205-1.
Vancouver
1.
Li W, Zhang Z, Zhou G, Kibleur P, Mei C, Shi J, et al. The effect of structural changes on the compressive strength of LVL. WOOD SCIENCE AND TECHNOLOGY. 2020;54(5):1253–67.
IEEE
[1]
W. Li et al., “The effect of structural changes on the compressive strength of LVL,” WOOD SCIENCE AND TECHNOLOGY, vol. 54, no. 5, pp. 1253–1267, 2020.
@article{8686312,
  abstract     = {{Laminated veneer lumber (LVL) is an important engineered wood product. Internal structural changes have a substantial influence on the mechanical performance of LVL. To investigate the relationship between the internal structural changes and the compressive strength, poplar LVL layering is manufactured by taking into account the veneer lathe checks, namely lathe checks both facing inwards (TLLT), lathe checks both oriented outwards (LTTL) and lathe checks in one layer facing outwards (LTLT). Macroscopic compressive strength of the samples is measured using a universal testing machine. Microscopic internal structural changes are periodically recorded with X-ray CT when the samples are compressed using a load cell. The results show that the compressive strength of LTLT is significantly higher than that of LTTL and TLLT types of LVL. During the compression test, density increase in the samples is non-homogenous. There is a minor increase in density of the glue line, while this is larger in regions with a low density. Density increase is mainly induced by collapse of large vessels. However, the presence of phenol formaldehyde resin can enhance the resistance of vessels against collapse. Structural changes, i.e., vessels collapse and collapse propagation, are likely to occur in locally heterogeneous regions. Propagation of collapsed vessels is more frequently observed in regions where large vessels are contiguous.}},
  author       = {{Li, Wanzhao and Zhang, Zheng and Zhou, Guoqiang and Kibleur, Pierre and Mei, Changtong and Shi, Jiangtao and Van Acker, Joris and Van den Bulcke, Jan}},
  issn         = {{0043-7719}},
  journal      = {{WOOD SCIENCE AND TECHNOLOGY}},
  keywords     = {{Plant Science,Industrial and Manufacturing Engineering,Forestry,General Materials Science,VENEER LUMBER LVL,WOOD}},
  language     = {{eng}},
  number       = {{5}},
  pages        = {{1253--1267}},
  title        = {{The effect of structural changes on the compressive strength of LVL}},
  url          = {{http://doi.org/10.1007/s00226-020-01205-1}},
  volume       = {{54}},
  year         = {{2020}},
}

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