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.
提出了一种用振动试验估算各桩圆杆质量的简便方法。试验中使用的标本为日本雪松(Cryptomeria ja ponica D. Don)圆杆(直径= 180 mm，长度= 2000 mm)，具有髓和后裂。进行了振动试验，研究了粘接位置对振动试验的影响。对各桩圆杆进行了振动试验，验证了附加质量振动法的估计精度。在粘贴上放置圆棒后，纵向振动的共振频率趋于稳定，弯曲振动的共振频率随着粘贴与试件端面距离的增加而减小，当粘贴与试件端面距离大于等于0.2 l (l:试件长度)时趋于稳定。当圆杆不粘贴时，弯曲共振频率无法识别，纵向振动的VAM估计精度依赖于试件。采用木胶粘接时，VAM对圆杆桩纵向振动的估计精度优于不使用粘接时的估计精度。VAM对弯曲振动的估计精度足够高。这些结果归因于减少了粘接和相邻圆杆之间的接触对振动的抑制。
{"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}
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.
{"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}
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.
{"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}
In or around 1972, an experimental building was constructed. One of the intents of the construction project was to demonstrate advancements in wood building construction design. In was value-engineered throughout. That is, its materials and systems were intended to function at or near design capacity. In 2019, part of the roof of the structure collapsed. This case study investigates two potential factors that led to the failure: stress concentration in excess of the allowable stress for 2 x 4 web members and insufficient plywood sheathing to support live loads caused by large rain events.
{"title":"Technical Note: Light Frame Wood Truss Roof Collapse in Mississippi, A Case Study","authors":"R. Shmulsky, Lon A. Yeary, J. Allen","doi":"10.22382/wfs-2021-22","DOIUrl":"https://doi.org/10.22382/wfs-2021-22","url":null,"abstract":"In or around 1972, an experimental building was constructed. One of the intents of the construction project was to demonstrate advancements in wood building construction design. In was value-engineered throughout. That is, its materials and systems were intended to function at or near design capacity. In 2019, part of the roof of the structure collapsed. This case study investigates two potential factors that led to the failure: stress concentration in excess of the allowable stress for 2 x 4 web members and insufficient plywood sheathing to support live loads caused by large rain events.","PeriodicalId":23620,"journal":{"name":"Wood and Fiber Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47587874","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}
C. Rozas, Marcia Vásquez, Patricia T. Vega, Arijit Sinha, Claudio Montero
The use of Eucalyptus nitens has diversified the Chilean lumber industry in unprecedented ways. However, growth-induced strains cause splitting and warping. The objective of this investigation was to determine the effect of the heat treatment applied to logs of Eucalyptus niten s on the reduction of growth stresses and improvement of quality in sawn wood. Logs were extracted at different heights of the tree for 15-yr and 20-yr-old trees. The sawmill process was allowed to obtain radial, mixed, and tangential plane pieces, at two thicknesses (25 and 50 mm). The evaluation of MC and warping was according to Chilean National Standards. The results obtained in this research suggest that by applying the heat treatment to Eucalyptus nitens logs, a significant reduction in growth strains can be achieved. Heat treatment also increased the quality of the pieces in terms of bow, crooking, and twisting. Therefore, there are substantial benefits of using heat treatments to reduce defects caused by growth strains and thus increase the quality of the wood and reduce its warp.
{"title":"Effect of Log Heat Treatment on Release of Growth Stresses in Eucalyptus Nitens","authors":"C. Rozas, Marcia Vásquez, Patricia T. Vega, Arijit Sinha, Claudio Montero","doi":"10.22382/wfs-2021-18","DOIUrl":"https://doi.org/10.22382/wfs-2021-18","url":null,"abstract":"The use of Eucalyptus nitens has diversified the Chilean lumber industry in unprecedented ways. However, growth-induced strains cause splitting and warping. The objective of this investigation was to determine the effect of the heat treatment applied to logs of Eucalyptus niten s on the reduction of growth stresses and improvement of quality in sawn wood. Logs were extracted at different heights of the tree for 15-yr and 20-yr-old trees. The sawmill process was allowed to obtain radial, mixed, and tangential plane pieces, at two thicknesses (25 and 50 mm). The evaluation of MC and warping was according to Chilean National Standards. The results obtained in this research suggest that by applying the heat treatment to Eucalyptus nitens logs, a significant reduction in growth strains can be achieved. Heat treatment also increased the quality of the pieces in terms of bow, crooking, and twisting. Therefore, there are substantial benefits of using heat treatments to reduce defects caused by growth strains and thus increase the quality of the wood and reduce its warp.","PeriodicalId":23620,"journal":{"name":"Wood and Fiber Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44711530","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}
The objective of this study was to determine the impact on termite feeding of wood ring count and MC in standard tests. Introduced species ( Coptotermes formosanus ) were tested in an American Wood Protection Association (AWPA) E1-97 standard laboratory test. Samples with a ring count in the range of 6 – 10 rings per inch (RPI) had a higher, but not significantly different, weight loss than the 4 – 6 RPI specified by E1-97. With respect to the MC, it was determined that a lower level of moisture than that currently specified by AWPA E1 would be preferred over the higher MC achieved in ASTM D3345. Sample placement on top of the sand was recommended over the burial procedure in ASTM D3345.
{"title":"The Effect of Variables on Laboratory Termite Testing: Part 3 - Test Block Density and Moisture Content","authors":"G. B. Lindsey, T. Amburgey, H. M. Barnes","doi":"10.22382/WFS-2021-11","DOIUrl":"https://doi.org/10.22382/WFS-2021-11","url":null,"abstract":"The objective of this study was to determine the impact on termite feeding of wood ring count and MC in standard tests. Introduced species ( Coptotermes formosanus ) were tested in an American Wood Protection Association (AWPA) E1-97 standard laboratory test. Samples with a ring count in the range of 6 – 10 rings per inch (RPI) had a higher, but not significantly different, weight loss than the 4 – 6 RPI specified by E1-97. With respect to the MC, it was determined that a lower level of moisture than that currently specified by AWPA E1 would be preferred over the higher MC achieved in ASTM D3345. Sample placement on top of the sand was recommended over the burial procedure in ASTM D3345.","PeriodicalId":23620,"journal":{"name":"Wood and Fiber Science","volume":"53 1","pages":"89-94"},"PeriodicalIF":1.4,"publicationDate":"2021-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45119594","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}
This study aimed to estimate the design value for mortise and tenon joints. In this respect, the design value for static load tests was determined using lower tolerance limit methods. A lower tolerance limit value at 0.99/0.99 confidence/proportional level was chosen as a design value (199.05 N.m) to secure higher joint reliability in a furniture frame. A side frame of a simple wooden chair was theoretically analyzed to obtain internal forces acting on joints, whereas the load of 1000 N was applied in the vertical direction on the top of the front leg. A full-frame chair with mortise and tenon joints would not be overstressed when a chair is under static load while not exceeding 2000 N. By applying this method, all chairs should survive static load up to 2000 N. While performing cyclic front-to-back load test, all tested chairs met the American Library Association requirements for light-duty service load, specified for household chairs. This study demonstrates that a joint failure could be prevented under expected loads specified by the standard if the joint design value is known.
{"title":"Evaluating Design of Mortise and Tenon Furniture Joints Under Bending Loads by Lower Tolerance","authors":"M. Uysal, E. Haviarova","doi":"10.22382/WFS-2021-13","DOIUrl":"https://doi.org/10.22382/WFS-2021-13","url":null,"abstract":"This study aimed to estimate the design value for mortise and tenon joints. In this respect, the design value for static load tests was determined using lower tolerance limit methods. A lower tolerance limit value at 0.99/0.99 confidence/proportional level was chosen as a design value (199.05 N.m) to secure higher joint reliability in a furniture frame. A side frame of a simple wooden chair was theoretically analyzed to obtain internal forces acting on joints, whereas the load of 1000 N was applied in the vertical direction on the top of the front leg. A full-frame chair with mortise and tenon joints would not be overstressed when a chair is under static load while not exceeding 2000 N. By applying this method, all chairs should survive static load up to 2000 N. While performing cyclic front-to-back load test, all tested chairs met the American Library Association requirements for light-duty service load, specified for household chairs. This study demonstrates that a joint failure could be prevented under expected loads specified by the standard if the joint design value is known.","PeriodicalId":23620,"journal":{"name":"Wood and Fiber Science","volume":"53 1","pages":"109-125"},"PeriodicalIF":1.4,"publicationDate":"2021-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68378012","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}
Tyloses are extruded cell contents of adjoining parenchyma cells that result in the obstruction of vessels. The function of tyloses in live trees is uncertain, but it has been proposed that they increase the natural durability of the wood by limiting water movement and the probing of fungal hyphae. Chestnut oak ( Quercus montana , aka Quercus prinus ) is inconsistent in producing tyloses; an initial study indicated a wide variation in the frequency of tyloses within and between trees of chestnut oak from three different states: VA, TN, and PA. This naturally occurring variation in tylosis abundance provides an opportunity to evaluate the impact of tyloses on natural durability. In this study, samples were further examined for extractive content, rate of wetting, and natural durability, to determine if these properties were related to the prevalence of tyloses. Tylosis abundance was not related to the density or extractive content but appeared to reduce water uptake, and fungal decay in laboratory tests. The mechanism of tyloses’ role in reducing decay is unclear but may include
{"title":"Role of Tyloses in the Durability of Chestnut Oak","authors":"W. Ruppitsch, S. Lebow, P. Lebow, Adam M. Taylor","doi":"10.22382/WFS-2021-14","DOIUrl":"https://doi.org/10.22382/WFS-2021-14","url":null,"abstract":"Tyloses are extruded cell contents of adjoining parenchyma cells that result in the obstruction of vessels. The function of tyloses in live trees is uncertain, but it has been proposed that they increase the natural durability of the wood by limiting water movement and the probing of fungal hyphae. Chestnut oak ( Quercus montana , aka Quercus prinus ) is inconsistent in producing tyloses; an initial study indicated a wide variation in the frequency of tyloses within and between trees of chestnut oak from three different states: VA, TN, and PA. This naturally occurring variation in tylosis abundance provides an opportunity to evaluate the impact of tyloses on natural durability. In this study, samples were further examined for extractive content, rate of wetting, and natural durability, to determine if these properties were related to the prevalence of tyloses. Tylosis abundance was not related to the density or extractive content but appeared to reduce water uptake, and fungal decay in laboratory tests. The mechanism of tyloses’ role in reducing decay is unclear but may include","PeriodicalId":23620,"journal":{"name":"Wood and Fiber Science","volume":"53 1","pages":"126-146"},"PeriodicalIF":1.4,"publicationDate":"2021-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46669304","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}
This paper presents a method which allows to assess the wettability of thermomechanical pulp (TMP) with thermoplastic. The method is based on the usage of laboratory sheets made of TMP and plastic granules which form drops under heat. The contact angle of the drops after re-solidification on the surface of the laboratory sheets serves as the wetting characteristic. This method enables a direct and evaluable testing of wood fiber thermoplastic combinations. The exemplary results indicate that wood species, pulping temperature and mercerization influence the wettability of TMP with thermoplastic.
{"title":"TECHNICAL NOTE: A Method to Determine the Wetting of Wood Fibers with Thermoplastic","authors":"S. Barth, T. Schmid, Andreas Michanickl","doi":"10.22382/WFS-2021-16","DOIUrl":"https://doi.org/10.22382/WFS-2021-16","url":null,"abstract":"This paper presents a method which allows to assess the wettability of thermomechanical pulp (TMP) with thermoplastic. The method is based on the usage of laboratory sheets made of TMP and plastic granules which form drops under heat. The contact angle of the drops after re-solidification on the surface of the laboratory sheets serves as the wetting characteristic. This method enables a direct and evaluable testing of wood fiber thermoplastic combinations. The exemplary results indicate that wood species, pulping temperature and mercerization influence the wettability of TMP with thermoplastic.","PeriodicalId":23620,"journal":{"name":"Wood and Fiber Science","volume":"53 1","pages":"157-159"},"PeriodicalIF":1.4,"publicationDate":"2021-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47530844","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}
C. Rozas, Arijit Sinha, Claudio Montero, P. V. Gutierrez, Marcia Vásquez
The objective of this research was to develop regression models, with the purpose of estimating the growth stresses and end splitting, in 12-yr-old Eucalyptus nitens trees located in the province of Valdivia, Chile. A total of 40 trees were samples. Their longitudinal residual strain (LRS) was measured using the CIRAD-Foret method and compared with the Council of Scientific and Industrial (CSIR) index and with a new index proposed in this investigation, called the splitting index. Physical and dendrometric properties of each selected tree were measured to identify possible correlations between these variables. These predictors were analyzed statistically, allowing the development of regression models, which showed a coefficient of determination (r 2 ) of 0.783 and 0.770 to predict the LRS and CSIR indexes, respectively. Finally, a relatively robust regression model was developed to predict end splitting in logs using LRS and physical and dendrometric parameters.
{"title":"Prediction of End Splitting in Log of Eucalyptus Nitens (H. Deane & Maiden) Maident through Regression Models Using Longitudinal Residual Strain, Physical and Dendrometric Properties","authors":"C. Rozas, Arijit Sinha, Claudio Montero, P. V. Gutierrez, Marcia Vásquez","doi":"10.22382/WFS-2021-10","DOIUrl":"https://doi.org/10.22382/WFS-2021-10","url":null,"abstract":"The objective of this research was to develop regression models, with the purpose of estimating the growth stresses and end splitting, in 12-yr-old Eucalyptus nitens trees located in the province of Valdivia, Chile. A total of 40 trees were samples. Their longitudinal residual strain (LRS) was measured using the CIRAD-Foret method and compared with the Council of Scientific and Industrial (CSIR) index and with a new index proposed in this investigation, called the splitting index. Physical and dendrometric properties of each selected tree were measured to identify possible correlations between these variables. These predictors were analyzed statistically, allowing the development of regression models, which showed a coefficient of determination (r 2 ) of 0.783 and 0.770 to predict the LRS and CSIR indexes, respectively. Finally, a relatively robust regression model was developed to predict end splitting in logs using LRS and physical and dendrometric parameters.","PeriodicalId":23620,"journal":{"name":"Wood and Fiber Science","volume":"53 1","pages":"79-88"},"PeriodicalIF":1.4,"publicationDate":"2021-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49629760","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}
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