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New Perspectives for LVL Manufacturing from Wood of Heterogeneous Quality—Part 2: Modeling and Manufacturing of Variable Stiffness Beams
Forests ( IF 2.4 ) Pub Date : 2021-09-17 , DOI: 10.3390/f12091275
Robin Duriot , Guillaume Pot , Stéphane Girardon , Louis Denaud

This paper presents a new strategy in the use of wood of heterogeneous quality for composing LVL products. The idea is to consider veneers representative of the resource variability and retain local stiffness information to control panel manufacturing fully. The placement of veneers is also no longer random as in the first part of this group of papers but optimized for the quality of veneers according to the requirement of bending stresses along the beam. In a four-point bending test arrangement, this means the high-quality veneer is concentrated in the center of the beam in the area between the loading points where the bending moments are the most important, and the low quality is located at the extremities. This initiates the creation of variable stiffness beams. This is driven by an algorithm developed and tested on representative veneer samples from the resource. Four LVL panels were manufactured by positioning the veneers in the same positions as in an analytical calculation model, which allowed the calculation of beam mechanical properties in four-point bending. The proposed optimization of LVL manufacturing from variable quality veneers should help for more efficient usage of forest resources. This optimization strategy showed notable gains for modeled and experimental mechanical properties, whether in terms of stiffness or strength. The analytical calculation of the local modulus of elasticity from modelized beams was satisfactory compared to the tests of the manufactured beams test results, allowing the reliability of the model for this property to be confirmed.

中文翻译:

用不同质量的木材制造 LVL 的新视角——第 2 部分:可变刚度梁的建模和制造

本文提出了一种使用不同质量的木材来制作 LVL 产品的新策略。这个想法是考虑代表资源可变性的单板,并保留局部刚度信息以完全控制面板制造。单板的放置也不再像这组论文的第一部分那样随机,而是根据沿梁的弯曲应力要求对单板的质量进行了优化。在四点弯曲试验布置中,这意味着高质量的单板集中在梁的中心,在弯曲力矩最重要的加载点之间的区域,而低质量的单板位于末端。这将启动可变刚度梁的创建。这是由对来自资源的代表性单板样品开发和测试的算法驱动的。通过将单板定位在与分析计算模型相同的位置来制造四个 LVL 面板,这允许计算四点弯曲中的梁力学性能。建议对不同质量单板的 LVL 制造进行优化,应该有助于更有效地利用森林资源。无论是在刚度还是强度方面,这种优化策略都显示出建模和实验机械性能的显着提高。与制造的梁测试结果的测试相比,模型化梁的局部弹性模量的分析计算令人满意,从而证实了该属性模型的可靠性。通过将单板定位在与分析计算模型相同的位置来制造四个 LVL 面板,这允许计算四点弯曲中的梁力学性能。建议对不同质量单板的 LVL 制造进行优化,应该有助于更有效地利用森林资源。无论是在刚度还是强度方面,这种优化策略都显示出建模和实验机械性能的显着提高。与制造的梁测试结果的测试相比,模型化梁的局部弹性模量的分析计算令人满意,从而证实了该属性模型的可靠性。通过将单板放置在与分析计算模型相同的位置来制造四个 LVL 面板,这允许计算四点弯曲梁的机械性能。建议对不同质量单板的 LVL 制造进行优化,应该有助于更有效地利用森林资源。无论是在刚度还是强度方面,这种优化策略都显示出建模和实验机械性能的显着提高。与制造的梁测试结果的测试相比,模型化梁的局部弹性模量的分析计算令人满意,从而证实了该属性模型的可靠性。这允许计算梁在四点弯曲时的力学性能。建议对不同质量单板的 LVL 制造进行优化,应该有助于更有效地利用森林资源。无论是在刚度还是强度方面,这种优化策略都显示出建模和实验机械性能的显着提高。与制造的梁测试结果的测试相比,模型化梁的局部弹性模量的分析计算令人满意,从而可以确认该属性的模型的可靠性。这允许计算梁在四点弯曲时的力学性能。建议对不同质量单板的 LVL 制造进行优化,应该有助于更有效地利用森林资源。无论是在刚度还是强度方面,这种优化策略都显示出建模和实验机械性能的显着提高。与制造的梁测试结果的测试相比,模型化梁的局部弹性模量的分析计算令人满意,从而证实了该属性模型的可靠性。无论是在刚度还是强度方面,这种优化策略都显示出建模和实验机械性能的显着提高。与制造的梁测试结果的测试相比,模型化梁的局部弹性模量的分析计算令人满意,从而证实了该属性模型的可靠性。无论是在刚度还是强度方面,这种优化策略都显示出建模和实验机械性能的显着提高。与制造的梁测试结果的测试相比,模型化梁的局部弹性模量的分析计算令人满意,从而可以确认该属性的模型的可靠性。
更新日期:2021-09-17
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