Pub Date : 2022-04-19DOI: 10.37763/wr.1336-4561/67.2.280290
Arif Caglar Konukcu
The fracture behavior of southern yellow pine (Pinus taeda L.) was experimentally analyzed in the radial-longitudinal and the radial-tangential crack propagation systems using asingle-edge-notched bending test method in mode I loading condition. Three fracture parameters, the initial slope, the fracture toughness, and the specific fracture energy, were determined from the obtained load-deformation curves of each test sample. The results were statistically analyzed and compared with each other using the independent samples t-test. Theradial-longitudinal crack propagation system had a significantly greater fracture toughness than in the radial-tangential crack propagation system. The stiffness in the radial-longitudinal system was also significantly higher than in the radial-tangential system. It was observed that the crack growing in the tangential direction needed more energy per unit area to separate awood sample into two halves. However, there was no significant difference between thespecific fracture energy values of crack propagationsystems.
{"title":"DETERMINATION OF MODE I FRACTURE BEHAVIOR OF SOUTHERN YELLOW PINE (PINUS TAEDA L.) WOOD USING SINGLE-EDGE-NOTCHED BENDING TEST","authors":"Arif Caglar Konukcu","doi":"10.37763/wr.1336-4561/67.2.280290","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.2.280290","url":null,"abstract":"The fracture behavior of southern yellow pine (Pinus taeda L.) was experimentally analyzed in the radial-longitudinal and the radial-tangential crack propagation systems using asingle-edge-notched bending test method in mode I loading condition. Three fracture parameters, the initial slope, the fracture toughness, and the specific fracture energy, were determined from the obtained load-deformation curves of each test sample. The results were statistically analyzed and compared with each other using the independent samples t-test. Theradial-longitudinal crack propagation system had a significantly greater fracture toughness than in the radial-tangential crack propagation system. The stiffness in the radial-longitudinal system was also significantly higher than in the radial-tangential system. It was observed that the crack growing in the tangential direction needed more energy per unit area to separate awood sample into two halves. However, there was no significant difference between thespecific fracture energy values of crack propagationsystems.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47137910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-19DOI: 10.37763/wr.1336-4561/67.2.241253
D. Dukarska, Jakub Kawalerczyk, Justyna Włodarczyk
The conducted study was aimed at finding the phenol-formaldehyde adhesive formulation containing both the nanoclay and the tannin filler which allows to manufacture water-resistant plywood characterized by the improved properties. The research assumed the application of six experimental variants having a different proportions of the mentioned components which were compared with the mixture prepared according to the industrial recipe. Properties of liquid mixtures such as their gelation time and viscosity were investigated. Moreover, thedifferential scanning calorimetry (DSC) was performed. The manufactured plywood panels were tested in terms of bonding quality, bending strength and modulus of elasticity. Studies have shown that after the adjustment in components proportions it is possible to achieve the proper viscosity level of adhesive mixtures. The results also indicated that thesuitable amount of nanoclay can contribute to the acceleration of resin gel time, however, the DSC analysis showed no effect on its reactivity. The nanoclay concentrations ranging from 2 to 4 pbw (parts by weight) per 100 g of adhesive positively influenced the bonding quality of plywood. Furthermore, there was no clear tendency in case of the effect of applied formulation on the modulus of elasticity and bending strength of plywood. The mixture containing 3 pbw of nanoclay and 5.3 pbw of tannin filler was distinguished as the most beneficial taking intoaccount the improvement in theproperties of manufactured plywood.
{"title":"PROPERTIES OF THE WATER-RESISTANT PLYWOOD GLUED WITH PF RESIN WITH THE ADDITION OF TANNIN FILLER AND NANOCLAY","authors":"D. Dukarska, Jakub Kawalerczyk, Justyna Włodarczyk","doi":"10.37763/wr.1336-4561/67.2.241253","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.2.241253","url":null,"abstract":"The conducted study was aimed at finding the phenol-formaldehyde adhesive formulation containing both the nanoclay and the tannin filler which allows to manufacture water-resistant plywood characterized by the improved properties. The research assumed the application of six experimental variants having a different proportions of the mentioned components which were compared with the mixture prepared according to the industrial recipe. Properties of liquid mixtures such as their gelation time and viscosity were investigated. Moreover, thedifferential scanning calorimetry (DSC) was performed. The manufactured plywood panels were tested in terms of bonding quality, bending strength and modulus of elasticity. Studies have shown that after the adjustment in components proportions it is possible to achieve the proper viscosity level of adhesive mixtures. The results also indicated that thesuitable amount of nanoclay can contribute to the acceleration of resin gel time, however, the DSC analysis showed no effect on its reactivity. The nanoclay concentrations ranging from 2 to 4 pbw (parts by weight) per 100 g of adhesive positively influenced the bonding quality of plywood. Furthermore, there was no clear tendency in case of the effect of applied formulation on the modulus of elasticity and bending strength of plywood. The mixture containing 3 pbw of nanoclay and 5.3 pbw of tannin filler was distinguished as the most beneficial taking intoaccount the improvement in theproperties of manufactured plywood.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49011902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-19DOI: 10.37763/wr.1336-4561/67.2.254267
Linda Makovická Osvaldová, Paulína Magdolenová, F. Markert, S. Zelinka, Louise Frederikke Enoksen, M. Klint
This paper models bench-scale experiments using computational fluid dynamics (CFD). The experiments measured the temperature profiles of fire-protectedcross laminated timber (CLT) specimens exposed to parametric fire curve. The bench-scale experiment specimen is 250 x 250 mm and consists of a CLT panel 100 mm with three layers of gypsum plasterboard 15.5 mm as thermal and fire insulation The specimens were exposed to a heat flux generated by aheat-transfer rate inducing system (H-TRIS) device. Two numerical models were created in order to copy the experiment conditions, one by using basic modelling techniques and one using advanced method. Comparing the layer temperature values of the experiment and basic model, a great difference was found. The difference between experimental and model temperatures increases the closer the analysed layer is to the heat source. The results show a good agreement between the model and the experiments, especially for the advanced numerical model.
本文使用计算流体动力学（CFD）对台架实验进行建模。实验测量了暴露于参数火灾曲线下的防火交叉层压木材（CLT）试样的温度分布。实验室规模的实验样品为250 x 250 mm，由一块100 mm的CLT面板和三层15.5 mm的石膏板组成，作为隔热和防火材料。样品暴露于热传递率诱导系统（H-TRIS）装置产生的热通量中。为了复制实验条件，创建了两个数值模型，一个使用基本建模技术，另一个使用高级方法。将实验和基本模型的层温值进行比较，发现差异很大。分析层离热源越近，实验温度和模型温度之间的差异就越大。结果表明，该模型与实验结果吻合良好，特别是对于先进的数值模型。
{"title":"MODELLING A CLT SPECIMEN PROTECTED WITH GYPSUM EXPOSED TO PARAMETRIC FIRE CURVE HEAT FLUX","authors":"Linda Makovická Osvaldová, Paulína Magdolenová, F. Markert, S. Zelinka, Louise Frederikke Enoksen, M. Klint","doi":"10.37763/wr.1336-4561/67.2.254267","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.2.254267","url":null,"abstract":"This paper models bench-scale experiments using computational fluid dynamics (CFD). The experiments measured the temperature profiles of fire-protectedcross laminated timber (CLT) specimens exposed to parametric fire curve. The bench-scale experiment specimen is 250 x 250 mm and consists of a CLT panel 100 mm with three layers of gypsum plasterboard 15.5 mm as thermal and fire insulation The specimens were exposed to a heat flux generated by aheat-transfer rate inducing system (H-TRIS) device. Two numerical models were created in order to copy the experiment conditions, one by using basic modelling techniques and one using advanced method. Comparing the layer temperature values of the experiment and basic model, a great difference was found. The difference between experimental and model temperatures increases the closer the analysed layer is to the heat source. The results show a good agreement between the model and the experiments, especially for the advanced numerical model.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43854287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-19DOI: 10.37763/wr.1336-4561/67.2.311325
Qianwen Hu, Xiaohe Li, Hai Fang, Qian Wan
By adopting the methods of PAD subjective emotion measurement and galvanic skin response physiological measurement, this study explores the differences in people's tactile perception evaluation of the surfaces of beech materialswith different roughness and shapes. The results show that females prefer beech samples with arc shapes, while males prefer thesamples with rectangle shapes; participants' emotional stability under a higher emotional arousal level can to a certain extentbe maintained due to the beech materials with arc shapes. The tactile perception of males for beech materials has a greater range of emotional arousal than that of females, but the arousal speed of males' emotions is lower than that of females' emotions. Moreover, a better tactile perception experience can be created for participants when theroughness of beech materials is limited within a certain range of conditions, and acertain sense of "anxiousness" will be brought to participants if the surface of beech materials is too rough.
{"title":"THE TACTILE PERCEPTION EVALUATION OF WOOD SURFACE WITH DIFFERENT ROUGHNESS AND SHAPES: A STUDY USING GALVANIC SKIN RESPONSE","authors":"Qianwen Hu, Xiaohe Li, Hai Fang, Qian Wan","doi":"10.37763/wr.1336-4561/67.2.311325","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.2.311325","url":null,"abstract":"By adopting the methods of PAD subjective emotion measurement and galvanic skin response physiological measurement, this study explores the differences in people's tactile perception evaluation of the surfaces of beech materialswith different roughness and shapes. The results show that females prefer beech samples with arc shapes, while males prefer thesamples with rectangle shapes; participants' emotional stability under a higher emotional arousal level can to a certain extentbe maintained due to the beech materials with arc shapes. The tactile perception of males for beech materials has a greater range of emotional arousal than that of females, but the arousal speed of males' emotions is lower than that of females' emotions. Moreover, a better tactile perception experience can be created for participants when theroughness of beech materials is limited within a certain range of conditions, and acertain sense of \"anxiousness\" will be brought to participants if the surface of beech materials is too rough.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49182482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-19DOI: 10.37763/wr.1336-4561/67.2.231240
Vinícius Borges de Moura Aquino, Larissa Soriani ZANINI RIBEIRO SOARES, H. Ruthes, F. Arroyo, I. F. Fraga, A. Christoforo, H. F. dos Santos, E. Chahud, Luiz Antônio Melgaço Nunes Branco, F. A. Rocco Lahr
In order to analyze the influence of moisture content variation on Cedrella odoratawood specie on strength and stiffness properties, considering 12% moisture content up to fiber saturation point (FSP). Most of strength and stiffness properties analyzed were significantly influenced by moisture content according statistical analysis. ANOVA, Anderson Darling and Multiple comparison tests were used at 5% significance level. Considering that most of properties were affected by moisture content, the equations to estimate wood properties according moisture decrease are quite precise, but most of estimations were higher than experimental values at 12% moisture content, indicating the need of a standard review for such estimators, which may lead to an unsafe timber structure design.
{"title":"ANALYSIS OF MOISTURE CONTENT VARIATION ON STRENGTH AND STIFFNESS PROPERTIES OF CEDRELLA ODORATA WOOD SPECIES","authors":"Vinícius Borges de Moura Aquino, Larissa Soriani ZANINI RIBEIRO SOARES, H. Ruthes, F. Arroyo, I. F. Fraga, A. Christoforo, H. F. dos Santos, E. Chahud, Luiz Antônio Melgaço Nunes Branco, F. A. Rocco Lahr","doi":"10.37763/wr.1336-4561/67.2.231240","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.2.231240","url":null,"abstract":"In order to analyze the influence of moisture content variation on Cedrella odoratawood specie on strength and stiffness properties, considering 12% moisture content up to fiber saturation point (FSP). Most of strength and stiffness properties analyzed were significantly influenced by moisture content according statistical analysis. ANOVA, Anderson Darling and Multiple comparison tests were used at 5% significance level. Considering that most of properties were affected by moisture content, the equations to estimate wood properties according moisture decrease are quite precise, but most of estimations were higher than experimental values at 12% moisture content, indicating the need of a standard review for such estimators, which may lead to an unsafe timber structure design.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42909683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-19DOI: 10.37763/wr.1336-4561/67.2.268279
KANG ZHOU, Li Luo, B. Na
After flame retardant and enhancing treatment, fast-grown poplar face the problem of leaching of pharmacy, which affected the effective permanence of the retard and further use is limited. In this paper, we study the fixed effect of low molecule phenol-formaldehyde (PF) resin on nitrogen and phosphorus (N-P) inorganic flame retardant compositeunder the condition of high relative humidity. The change oflateralsizes and quality of the specimens were emphasized in the experiment. Results reveal that the greater the concentration of flame retardant was,the greater weight gain percentage of the samples was, and the more serious leach was in the test, after the specimen was modified with the flame retardant.When weight gain percentage of the specimens is same, the greater the concentration of PF resin test solution was,better effect of the leachresistant will be obtained with the concentration of PF test solution increased.The PF resin with 25% concentration had the best effect to reduce the leach of N-P inorganic composite retards. From the comparative analysis above, it was advisable to indicate the PF resin with 25% concentration had the best effect to reduce the leach of N-P inorganic composite retards.
{"title":"STUDY ON FLAME RETARDANT LEACH RESISTANT OF MODIFIED POPLAR WOOD","authors":"KANG ZHOU, Li Luo, B. Na","doi":"10.37763/wr.1336-4561/67.2.268279","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.2.268279","url":null,"abstract":"After flame retardant and enhancing treatment, fast-grown poplar face the problem of leaching of pharmacy, which affected the effective permanence of the retard and further use is limited. In this paper, we study the fixed effect of low molecule phenol-formaldehyde (PF) resin on nitrogen and phosphorus (N-P) inorganic flame retardant compositeunder the condition of high relative humidity. The change oflateralsizes and quality of the specimens were emphasized in the experiment. Results reveal that the greater the concentration of flame retardant was,the greater weight gain percentage of the samples was, and the more serious leach was in the test, after the specimen was modified with the flame retardant.When weight gain percentage of the specimens is same, the greater the concentration of PF resin test solution was,better effect of the leachresistant will be obtained with the concentration of PF test solution increased.The PF resin with 25% concentration had the best effect to reduce the leach of N-P inorganic composite retards. From the comparative analysis above, it was advisable to indicate the PF resin with 25% concentration had the best effect to reduce the leach of N-P inorganic composite retards.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42675980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-19DOI: 10.37763/wr.1336-4561/67.2.187197
Ying-Pe Chang, Chunlong Zheng, Xuejing Shao, Zhiyi Xia, Enhua Xi
This study describes the seasonal dynamic changes of heartwood transformation of Larix gmelinii by establishing the relationship between trunk radius, heartwood radius, sapwood width, trunk growth rings and heartwood growth rings in different heights during the growth season with regression analysis. The results showed that the initial age of heartwood formation was 7.25 years.Heartwood began to form when the trunk radius was greater than 2.6 cm, and then the heartwood radius grew 0.85 cm for every 1.00 cm growth of the trunk radius.It was also demonstrated that the significant change and growth rate of heartwood with month were higher than sapwood at the tree base and 1 m height, but lower than sapwood at 5m and 9 m height.The absolute content of heartwood and sapwood area decreased with tree height, however, the relative content of sapwood area increased with the tree height.
{"title":"SEASONAL DYNAMIC CHANGES OF SAPWOOD AND HEARTWOOD IN LARIX GMELINII","authors":"Ying-Pe Chang, Chunlong Zheng, Xuejing Shao, Zhiyi Xia, Enhua Xi","doi":"10.37763/wr.1336-4561/67.2.187197","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.2.187197","url":null,"abstract":"This study describes the seasonal dynamic changes of heartwood transformation of Larix gmelinii by establishing the relationship between trunk radius, heartwood radius, sapwood width, trunk growth rings and heartwood growth rings in different heights during the growth season with regression analysis. The results showed that the initial age of heartwood formation was 7.25 years.Heartwood began to form when the trunk radius was greater than 2.6 cm, and then the heartwood radius grew 0.85 cm for every 1.00 cm growth of the trunk radius.It was also demonstrated that the significant change and growth rate of heartwood with month were higher than sapwood at the tree base and 1 m height, but lower than sapwood at 5m and 9 m height.The absolute content of heartwood and sapwood area decreased with tree height, however, the relative content of sapwood area increased with the tree height.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43065155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-19DOI: 10.37763/wr.1336-4561/67.2.340347
M. Halaj, Š. Boháček, A. Pažitný, M. Stankovská, A. Russ
Nanofibrillated cellulose was prepared from distillery refuse based on maize starch using the extraction with NaOH and HCl involving centrifugation. SEM images of bleached kraft pulp with/without the addition of nanofibrillated cellulose were compared. Theresults showed that the application of nanofibrillated cellulose caused a visible reduction in the surface porosity. Conversely, mixing of the pulp with the nanofibrillated cellulose resulted in large pores among the fibres. The effect of the cationic retention aid on porosity was not significant, observed in the fines retention. A minimal difference in porosity was found among of fine and coarse fibres.When lyophilisationas drying method was used it yielded nanofibrillated cellulose with a size in the range of approximately 100 to 150 nm.
{"title":"METHODS OF PREPARATION OF NANOFIBRILLATED CELLULOSE FOR SPECIAL FILTER PAPERS WITH EFFECTIVE AIR FILTRATION. SHORT NOTES","authors":"M. Halaj, Š. Boháček, A. Pažitný, M. Stankovská, A. Russ","doi":"10.37763/wr.1336-4561/67.2.340347","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.2.340347","url":null,"abstract":"Nanofibrillated cellulose was prepared from distillery refuse based on maize starch using the extraction with NaOH and HCl involving centrifugation. SEM images of bleached kraft pulp with/without the addition of nanofibrillated cellulose were compared. Theresults showed that the application of nanofibrillated cellulose caused a visible reduction in the surface porosity. Conversely, mixing of the pulp with the nanofibrillated cellulose resulted in large pores among the fibres. The effect of the cationic retention aid on porosity was not significant, observed in the fines retention. A minimal difference in porosity was found among of fine and coarse fibres.When lyophilisationas drying method was used it yielded nanofibrillated cellulose with a size in the range of approximately 100 to 150 nm.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42554461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-19DOI: 10.37763/wr.1336-4561/67.2.178186
E. Jang, C. Kang
The article deals with the effects of bulk density on thermal conductivity in specimens of 15Korean woods (Zelkova serrata, Pinus densiflora, Cornus controversa, Betula schmidtii, Betula platyphylla var. japonica, Ginkgo biloba L.,Cedrela sinensis A. Juss., Fraxinus mandshurica, Ulmus davidiana var. japonica, Prunus sargentii Rehder, Paulownia tomentosa (Thunb.) Steud., Larix kaempferi (Lamb.) Carrière, Robinia pseudoacacia, Kalopanax septemlobus and Tilia amurensis).The results of this study were compared with previous studies performed on wood specimens fromChina, India, and Turkey. Consistent with these previous studies, bulk density and thermal conductivity were positively correlated in Korean woods, and a simple regression model with a very high correlation of R2(94%) was obtained. Interestingly, we observed some variation between our simple regression models and those generated by previous researchers who had examined non-Korean woods.
{"title":"THE RELATIONSHIP BETWEEN BULK DENSITY AND THERMAL CONDUCTIVITY IN VARIOUS KOREAN WOODS","authors":"E. Jang, C. Kang","doi":"10.37763/wr.1336-4561/67.2.178186","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.2.178186","url":null,"abstract":"The article deals with the effects of bulk density on thermal conductivity in specimens of 15Korean woods (Zelkova serrata, Pinus densiflora, Cornus controversa, Betula schmidtii, Betula platyphylla var. japonica, Ginkgo biloba L.,Cedrela sinensis A. Juss., Fraxinus mandshurica, Ulmus davidiana var. japonica, Prunus sargentii Rehder, Paulownia tomentosa (Thunb.) Steud., Larix kaempferi (Lamb.) Carrière, Robinia pseudoacacia, Kalopanax septemlobus and Tilia amurensis).The results of this study were compared with previous studies performed on wood specimens fromChina, India, and Turkey. Consistent with these previous studies, bulk density and thermal conductivity were positively correlated in Korean woods, and a simple regression model with a very high correlation of R2(94%) was obtained. Interestingly, we observed some variation between our simple regression models and those generated by previous researchers who had examined non-Korean woods.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41750188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-19DOI: 10.37763/wr.1336-4561/67.2.291301
Mingbin Liu, Nan Su, Xiurong Zhu
As the preferable lateral resistance system of a wood shear wall is attributedto the good lateral performance of nail connection, this paper aims at investigating the pull-out and shear performances of framing members’ nail connection in wood shear walls under monotonic loading. It was found that the main failure mode of the pull-out behavior of nail connection was the withdrawal of threaded nails from framing members. In addition, the shear behavior of nail connection was characterized by plastic hinge of threaded nails, local tear of spruce-pine-fir(SPF)on the top of nails, and nail caps that were obliquely embedded into the surface of SPF. The average ultimate load and displacement of shear mode were 1.48 times and 5.12 times higher than those of pull-out mode, respectively.According to the research results, thecorresponding exponential numerical model was established, which provided basic data for the lateral performance research and finite element simulation analysis of wood shear walls nail connection.
{"title":"DESIGN AND PERFORMANCE OF NAIL CONNECTION IN WOOD FRAMING SHEAR WALLS","authors":"Mingbin Liu, Nan Su, Xiurong Zhu","doi":"10.37763/wr.1336-4561/67.2.291301","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.2.291301","url":null,"abstract":"As the preferable lateral resistance system of a wood shear wall is attributedto the good lateral performance of nail connection, this paper aims at investigating the pull-out and shear performances of framing members’ nail connection in wood shear walls under monotonic loading. It was found that the main failure mode of the pull-out behavior of nail connection was the withdrawal of threaded nails from framing members. In addition, the shear behavior of nail connection was characterized by plastic hinge of threaded nails, local tear of spruce-pine-fir(SPF)on the top of nails, and nail caps that were obliquely embedded into the surface of SPF. The average ultimate load and displacement of shear mode were 1.48 times and 5.12 times higher than those of pull-out mode, respectively.According to the research results, thecorresponding exponential numerical model was established, which provided basic data for the lateral performance research and finite element simulation analysis of wood shear walls nail connection.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46208134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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