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Improve regression-based models for prediction of internal-bond strength of particleboard using Buckingham's pi-theorem

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Journal of Forestry Research 2013年第4期24卷 735-740页

作者： akbar rostampour haftkhani Mohammad Arabi Department of Wood & Paper Science and Technology Faculty of Natural ResourcesUniversity of Tehran

Internal bond （IB） strength is one of the most important me- chanical properties that indicate particleboard quality. The aim of this study was to find a simple regression model that considers the most important parameters that can influence on IB strength. In this study, IB strength was predicted by three kinds of equations （linear, quadratic, and exponential） that were based on the percentage of adhesive （8%, 9.5%, and 11%）, particle size （＋5, -5 ＋8, -8 12, and -12 mesh）, and density （0.65, 0.7, and 0.75 g/cm3）. Our analysis of the results （using SHAZAM 9 software） showed that the exponential function best fitted the experi- mental data and predicted the IB strength with 18~,/0 error. In order de- crease the error percentage, the Buckingham Pi theorem was used to build regression models for predicting IB strength based on particle size,

关键词： Buckingham's Pi theorem intemal bond strength particle-board screw withdrawal resistance.

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Analysis of factors affecting diagonal tension and compression capacity of corner joints in furniture frames fabricated with dovetail key

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Journal of Forestry Research 2013年第1期24卷 155-168页

作者： Mosayeb Dalvand Ghanbar Ebrahimi akbar rostampour haftkhani Sadegh Maleki Department of Wood and Paper Science and Technology Faculty of Natural ResourcesUniversity of TehranKarajIran.

This study was conducted to analyze the effect of joint type, and numbers and types of dovetail keys on diagonal tension and compression performance of corner joints in a furniture frame. Joint members were cut from white fir lumber. Butted and mitered joints were constructed with one and two dovetail key（s） with butterfly and H shapes. Joints were glued by polyvinyl acetate （PVAc） and cynoacrylate （CA）. Compression capacity of joints was higher than diagonal tension. Mitered joints were stronger than butted ones. Butterfly dovetail keys were superior to H shape keys. Double keys performed better than single key. Experimental joints glued with PVAc were stronger than those glued with CA glue and control specimens. In terms of strength, butterfly dovetailed joints were comparable with doweled joints.

关键词： diagonal tension diagonal compression dovetail key joints lumber

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