Wood and Fiber Science最新文献_第5页

Mass Estimation of Piled Round Bars through Vibration Tests 用振动试验估算圆桩质量

IF 1.4 4区工程技术

Wood and Fiber Science Pub Date : 2021-08-11 DOI: 10.22382/wfs-2021-21

Y. Kubojima, Satomi Sonoda, Hideo Kato

{"title":"Mass Estimation of Piled Round Bars through Vibration Tests","authors":"Y. Kubojima, Satomi Sonoda, Hideo Kato","doi":"10.22382/wfs-2021-21","DOIUrl":"https://doi.org/10.22382/wfs-2021-21","url":null,"abstract":"A simple method was developed to estimate the mass of each piled round bar using a vibration test. Specimens used in the tests were Japanese cedar ( Cryptomeria ja ponica D. Don) round bars (diameter = 180 mm, length = 2000 mm) with a pith and a back split. Vibration tests were conducted, and the effect of sticker positions on the vibration test was investigated. The vibration tests were conducted for each piled round bar and the estimation accuracy of the vibration method with additional mass (VAM) was examined. By placing the round bar on the stickers, the resonance frequency of the longitudinal vibration was stable while that of the bending vibration decreased with the increase in the distance between the sticker and the specimen end and stabilized when this distance was greater than or equal to 0.2 l ( l: specimen length). When the round bars were piled with no stickers, the bending resonance frequency could not be identified and the VAM estimation accuracy of the longitudinal vibration depended on the specimens. The estimation accuracy of VAM for the longitudinal vibration of the piled round bars while using stickers made of wood and rubber was superior to that without stickers. The estimation accuracy of VAM for the bending vibration was sufficiently high. These results were attributed to the reduction of the vibration restraint by the stickers and the contact between adjacent round bars.","PeriodicalId":23620,"journal":{"name":"Wood and Fiber Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45137108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Manufacturing and Interfacial Bonding Behavior of EVA Film Reinforced Flexible Decorative Veneer EVA膜增强柔性装饰单板的制备及界面粘接性能

IF 1.4 4区工程技术

Wood and Fiber Science Pub Date : 2021-08-11 DOI: 10.22382/wfs-2021-19

Lu Fang, Xinhao Zhang, Yu Zhang, Q. Tang

{"title":"Manufacturing and Interfacial Bonding Behavior of EVA Film Reinforced Flexible Decorative Veneer","authors":"Lu Fang, Xinhao Zhang, Yu Zhang, Q. Tang","doi":"10.22382/wfs-2021-19","DOIUrl":"https://doi.org/10.22382/wfs-2021-19","url":null,"abstract":"Polyethylene film reinforced flexible decorative veneer has attracted wide attention. However, its curling deformation has not been well solved due to the high processing temperature. Ethylene-vinyl acetate copolymer (EVA) has lower melting temperature and better flexibility than polyethylene. In this work, EVA film was selected to enhance Manchurian ash ( Fraxinus mandshurica) aimed at preparing flexible decorative veneer with high strength and low curling degree. Box-Behnken experimental design method was applied to determine the optimum processing parameters. The secondary overlaying performance of the flexible veneer was evaluated. Under optimum conditions the EVA reinforced veneer obtained a maximum transverse tensile strength of 2.42 MPa. EVA can form a continuous interface with the veneer, which was helpful to improve the flexibility of the veneer. Curling degree of the EVA film reinforced veneer was far less than that of the polyethylene reinforced veneer even at the same processing temperature. EVA reinforced flexible veneer was good to be used to decorate wood-based panels without additional adhesives. Both immersion peel strength and surface bonding strength of the prepared decorative panel can meet the requirements of GB/T 15104-2006.","PeriodicalId":23620,"journal":{"name":"Wood and Fiber Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45461724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Variation in Wood Properties of Hybrid Poplar Lumber by Radial and Vertical Position in Stem: A Case Study from Boardman, Oregon 杂交杨木木材的木材特性随树干径向和垂直位置的变化——以俄勒冈州Boardman为例

IF 1.4 4区工程技术

Wood and Fiber Science Pub Date : 2021-08-11 DOI: 10.22382/wfs-2021-17

A. Himes, S. Leavengood, A. Polinko

{"title":"Variation in Wood Properties of Hybrid Poplar Lumber by Radial and Vertical Position in Stem: A Case Study from Boardman, Oregon","authors":"A. Himes, S. Leavengood, A. Polinko","doi":"10.22382/wfs-2021-17","DOIUrl":"https://doi.org/10.22382/wfs-2021-17","url":null,"abstract":"Understanding of wood quality of hybrid poplar is critically important for manufacturers who want to know the suitability of the wood for specific products. To this end, lumber was milled from the merchantable stem of four hybrid poplar clones ages 10-11 yr., grown at single site near Boardman, OR. The vertical and radial position in the stem were recorded for each board and the boards were kiln dried, surfaced, and samples from each board tested to determine specific gravity (SG), dimensional stability, hardness, screw withdrawal, and bending strength and stiffness (modulus of rupture [MOR] and modulus of elasticity [MOE], respectively) from small clear specimens. Results show differences in wood properties relative to vertical and radial position in the stem. SG, hardness, screw withdrawal, and bending properties of lumber samples generally increased with height in tree. Tangential hardness, SG, and MOR varied significantly between different sides of the trees corresponding to predominant wind in the area. Boards milled from the center of the stem had lower MOE and MOR than boards milled from nearer the bark. The results of this study may be used to target specific stem locations for different end uses.","PeriodicalId":23620,"journal":{"name":"Wood and Fiber Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44611379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Technical Note: Light Frame Wood Truss Roof Collapse in Mississippi, A Case Study 技术说明：密西西比州轻型框架木特拉斯屋顶坍塌案例研究

IF 1.4 4区工程技术

Wood and Fiber Science Pub Date : 2021-07-31 DOI: 10.22382/wfs-2021-22

R. Shmulsky, Lon A. Yeary, J. Allen

引用次数: 0

Effect of Log Heat Treatment on Release of Growth Stresses in Eucalyptus Nitens 原木热处理对桉树生长应力释放的影响

IF 1.4 4区工程技术

Wood and Fiber Science Pub Date : 2021-07-29 DOI: 10.22382/wfs-2021-18

C. Rozas, Marcia Vásquez, Patricia T. Vega, Arijit Sinha, Claudio Montero

引用次数: 2

The Effect of Variables on Laboratory Termite Testing: Part 3 - Test Block Density and Moisture Content 变数对实验室白蚁测试的影响:第3部分-测试块密度和水分含量