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首页> 外文期刊>Wood and Fiber Science >FINITE ELEMENT MODELING OF LAMINATE WOOD COMPOSITES HYGROMECHANICAL BEHAVIOR CONSIDERING DIFFUSION EFFECTS IN THE ADHESIVE LAYERS
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FINITE ELEMENT MODELING OF LAMINATE WOOD COMPOSITES HYGROMECHANICAL BEHAVIOR CONSIDERING DIFFUSION EFFECTS IN THE ADHESIVE LAYERS

机译：考虑胶粘剂层扩散效应的层状木材复合材料力学性能的有限元模拟

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摘要

The performance and quality of appearance layered wood composite products depend largely on their dimensional stability. Layers of various wood species and orientation and the presence of adhesive layers in such products may induce deformation following moisture content changes and reduce product value. In this context, research on the design and hygromechanical behavior of layered wood composites is of primary importance. More specifically, the impact of the adhesive layers on moisture movement anddimensional stability is not known. The main objective of this paper is to demonstrate the impact of the adhesive layer on the dimensional stability of layered wood composites and how it should be modeled by the finite element method. The impacts of meshdensity, degree of interpolation of the elements and linear interpolation of the adhesive properties in the wood-adhesive interface of an engineered wood flooring strip were studied to determine the role of an adhesive layer in the cupping process. Theresults show that when the effective diffusion coefficient of the adhesive layer decreases, the gap between the linear and quadratic interpolation increases. It is however relatively small and when the number of element layers used in the adhesive increases, the gap between the linear and quadratic interpolation increases. The degree of interpolation used for the mechanical component of the model has a minor effect on cupping. Therefore, the choice of a higher degree of interpolation than linear is notnecessary. The use of a mesh with a single layer of elements in the adhesive layer can lead to important approximation errors. Therefore, the utilization of more than one layer of elements in the adhesive is necessary.
机译：外观层状木质复合产品的性能和质量在很大程度上取决于其尺寸稳定性。此类产品中各种木材种类和方向的层以及粘合剂层的存在都可能在水分含量变化后引起变形并降低产品价值。在这种情况下，研究层状木质复合材料的设计和湿力学性能至关重要。更具体地，粘合剂层对水分运动和尺寸稳定性的影响是未知的。本文的主要目的是证明胶粘剂层对层状木质复合材料尺寸稳定性的影响以及应如何使用有限元方法对其进行建模。研究了工程木地板条的木材-胶粘剂界面中的密度，元素插值程度和胶粘剂特性的线性插值的影响，以确定胶粘剂层在拔罐过程中的作用。结果表明，当粘合剂层的有效扩散系数减小时，线性和二次插值之间的间隙增大。但是，它相对较小，并且当粘合剂中使用的元素层数增加时，线性插值和二次插值之间的间隙会增加。用于模型机械成分的内插度对拔罐影响较小。因此，不必要选择比线性更高的插值度。在粘合剂层中使用具有单层元素的网格会导致重要的近似误差。因此，需要在粘合剂中使用多于一层的元素。

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