Predictive Models for Elastic Bending Behavior of a Wood Composite Sandwich Panel
Predictive Models for Elastic Bending Behavior of a Wood Composite Sandwich Panel
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DOI：
10.3390/f11060624
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发表时间：
2020-06-01
期刊：
影响因子：
2.9
通讯作者：
Cofer, William
中科院分区：
文献类型：
--
作者：
Mohammadabadi, Mostafa;Jarvis, James;Cofer, William
由小直径的美国黑松和黄松木材制成的股线被用来制造复合夹层结构，作为传统建筑围护材料（如屋顶）的替代品。这是有益的，开发模型，验证预测这些夹层结构的行为下，典型的服务负载。当用于建筑围护结构时，这些结构板在其使用寿命期间由于风、雪、活荷载和静荷载而受到弯曲。摘要本研究旨在建立一理论及有限元素分析模式，以评估双轴瓦楞芯材夹芯板之弹性弯曲行为。剪切变形的影响被证明是可以忽略不计的应用两个理论模型，欧拉-伯努利梁理论和Zerishenko梁理论。进行拉伸试验以获得材料特性作为模型的输入。使用Euler-Bernoulli，Eulshenko和FE模型预测的夹层板的弯曲刚度与实验结果分别相差3.6%，5.2%和6.5%。使用有限元和理论模型，进行了敏感性分析，以探讨弯曲刚度的变化，由于木材复合材料的材料特性的内在变化的影响。
Strands produced from small-diameter timbers of lodgepole and ponderosa pine were used to fabricate a composite sandwich structure as a replacement for traditional building envelope materials, such as roofing. It is beneficial to develop models that are verified to predict the behavior of these sandwich structures under typical service loads. When used for building envelopes, these structural panels are subjected to bending due to wind, snow, live, and dead loads during their service life. The objective of this study was to develop a theoretical and a finite element (FE) model to evaluate the elastic bending behavior of the wood-strand composite sandwich panel with a biaxial corrugated core. The effect of shear deformation was shown to be negligible by applying two theoretical models, the Euler-Bernoulli and Timoshenko beam theories. Tensile tests were conducted to obtain the material properties as inputs into the models. Predicted bending stiffness of the sandwich panels using Euler-Bernoulli, Timoshenko, and FE models differed from the experimental results by 3.6%, 5.2%, and 6.5%, respectively. Using FE and theoretical models, a sensitivity analysis was conducted to explore the effect of change in bending stiffness due to intrinsic variation in material properties of the wood composite material.