The Characteristics of Glued Tensile Shear Strength Constituted of Wood Cut by CO_(2) Laser

查看全文 作　　者：Fatemeh [1,2]Rezaei;Milan [1,3,4]Gaff;Róbert [5]Nemeth;Jerzy [6]Smardzewski;Peter [7]Niemz;Haitao [8,9]Li;Anil Kumar [1,10]Sethy;Luigi [11]Todaro;Gourav [1]Kamboj;Sumanta [1]Das;Roberto [1]Corleto;Gianluca [1]Ditommaso;Miklós [5]Bak

机构地区：[1]Department of Wood Processing,Faculty of Forestry and Wood Sciences,Czech University of Life Sciences Prague,Prague,16521,Czech Republic;[2]Department of Wood Science and Engineering,Oregon State University,Corvallis,OR,USA;[3]Department of Furniture,Design and Habitat Brno,Mendel University in Brno,Brno,61300,Czech Republic;[4]Experimental Centre,Faculty of Civil Engineering,Czech Technical University in Prague,Prague,16629,Czech Republic;[5]Institute of Wood Technology and Technical Sciences,University of Sopron,Sopron,9400,Hungary;[6]Department of Furniture Design,Faculty of Forestry and Wood Technology,Poznan University of Life Sciences,Poznan,60637,Poland;[7]ETH Zurich,Institute for Building Materials,Lulea University of Technology,Zurich,CH,8093,Switzerland;[8]School of Civil Engineering,Nanjing Forestry University,Nanjing,China;[9]Joint International Research Laboratory of Bio-Composite BuildingMaterials and Structures,Nanjing Forestry University,Nanjing,China;[10]Wood Properties and Processing,Institute of Wood Science and Technology,Bangalore,560003,India;[11]School of Agricultural Forestry,Food,and Environmental Science,University of Basilicata,Potenza,85100,Italy

出　　处：《Journal of Renewable Materials》索引2023年第11卷第8期,共20页

摘　　要：The performance of engineered wood products is highly associated with proper bonding and an efﬁcient cutting method.This paper investigates the inﬂuence of CO_(2) laser cutting on the wetting properties,the modiﬁed che-mical component of the laser-cut surface,and the strength and adhesive penetration near the bondline.Beech-wood is cut by the laser with varying processing parameters,cutting speeds,gas pressures,and focal point positions.The laser-cut samples were divided into two groups,sanded and non-sanded samples.Polyvinyl acetate adhesive(PVAc)was used to bond the groups of laser-cut samples.After assembly with cold pressing,the tensile shear test was carried out.Numerical modelling was carried out to determine the partial elongation and shear strain of the glue line.Based on this,the shear modulus and linear elasticity of the glue line were estimated.Scan-ning electron microscopy was used to assess the adhesive penetration into the porosity structure of the laser-cut samples,and the depth of the heat-affected zone.The laser-cut surface was analysed by Fourier transform infrared spectroscopy.The wetting properties of the laser-cut surface were investigated by using a contact angle goni-ometer.The numerical model of the strain-stress curve conﬁrmed the experimental model.The highest modulus of the linear elasticity of the glue in the numerical calculation belongs to the joint containing laser-cut samples at a gas pressure of 21(bar).The penetration depth of PVAc adhesive into the porosity structure of the laser-cut sam-ples was similar to that of sawn samples.The deepest heat-affected zone in the laser-cut samples was 150µm.A PVAc drop disappeared immediately on the laser-cut surface without sanding,but gradually on the sanded surface.In contrast,the drop on the sawn surface remained with an angle of 32°–48°.The degradation of hemi-cellulose and lignin was proven by the lower intensity of the C=O and C-O Bonds,compared to the sawn surface. 关键词：CO_(2)laser cutting speed focal point position gas pressure glued tensile shear strength

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The Characteristics of Glued Tensile Shear Strength Constituted of Wood Cut by CO_(2) Laser

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