共查询到19条相似文献，搜索用时 269 毫秒
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为扩大低质人工林木材在家具中的应用.笔者以杨木衣柜为研究对象,针对柜门角部的受力特点,研究了不同的接合形式对角部抗弯和抗扭强度的影响以及材料的混合使用对角部接合的增强作用。试验结果表明柜门角部接合形式对接合强度具有影响:①榫接合时,直角接合斜角接合,圆棒榫接合时,斜角接合直角接合;②抗弯强度:冒头与立挺齐平冒头盖立挺,抗扭强度:冒头与立挺齐平冒头盖立挺,而且两种不同的接合方式对抗扭强度影响比对抗弯强度的影响大;③榫接合开口情况对接合强度的影响是全开口榫半开口榫闭口榫;④双圆棒榫+不锈钢角码接合相比双圆棒榫接合有增强作用,但是效果有限;斜角接合水曲柳饼形榫增强效果较明显。 相似文献
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以南方速生脱脂马尾松松木为基材,以"L"型和"T"型构件为基本构件形式,采用力学实验方法 ,对理想使用状态——即在外力垂直荷载匀速加载的作用下使构件节点发生破坏或变形,测试构件节点破坏强度值及其破坏或变形形式。实验针对8种不同框架节点接合方式(贯通直角单榫接合、不贯通直角暗榫接合、双圆榫接合、倒刺螺母连接件接合、双圆榫与倒刺螺母共同接合、三件式偏心连接件接合,以及45°双圆榫斜角接合和45°不贯通榫斜角接合)的接合强度进行测定。实验结果表明:(1)对于直角连接构件,采用贯通直角单榫接合时的节点接合强度最大;双圆榫与倒刺螺母共同连接的节点接合强度次之;然后强度值从高到低依次为双圆榫接合、倒刺螺母螺杆连接件接合、不贯通直角单榫接合,接合强度最小的是偏心连接件接合;(2)对于45°斜角连接构件,采用45°不贯通榫斜角接合的节点强度大于45°双圆榫斜角接合的节点强度;(3)在相同条件下,"T"型实木构件的节点接合强度总体上大于"L"型实木构件的节点接合强度。研究表明:节点处的基本构件形式("L"型或"T"型)、角部构件的连接形式(直角构件或斜角构件),以及节点的接合方式等都不同程度地影响着马尾松松木家具框架节点的接合强度。 相似文献
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探索竹集成家具五金角接合处的接合性能特点以改善竹集成材家具角部五金接合,测试与比较竹集成材家具角部常用的四类五金接合形式的接合性能。结果表明:1)螺钉类与螺栓类的接合强度较高,但螺栓类破坏相对较少且能够多次拆装,分析可知螺栓类角接合性能相对较好;2)在螺栓类与不同类型预埋螺母配合时,存在预埋螺母易于拔出的问题,特别是尼龙胶塞,发现嵌入竹集成材板件困难的,抗拔力小,更易拔出;3)竹集成材家具角部在同一种五金角接合形式下的抗拉强度明显大于抗压强度,抗拉弯矩明显大于抗压弯矩,说明竹集成材家具角部在受到内向压力时比受外向拉力时更容易发生破坏。 相似文献
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文中从实木榫接合家具节点、构件和整体框架3个层面,总结、分析有限元法在实木榫接合家具结构设计中的应用现状,并对该领域存在的主要问题及未来研究趋势进行了阐释。目前主要存在以下问题:1）未形成系统性的有限元分析方法,不同研究者之间存在较大差异;2）分析准确度不高,大多研究仅为有限元软件的模拟分析,缺乏试验验证;3）未建立合理的榫接合节点有限元模型,通常将榫接合节点视为刚性节点处理。未来研究可围绕以下几方面开展:1）榫接合节点有限元模型的建立方法及简化方法;2）实木榫接合家具疲劳寿命的有限元分析方法;3）基于有限元法的实木榫接合家具结构优化设计方法;4）二次开发,在有限元分析软件的基础上,建立实木榫接合家具结构设计模块;5）实木榫接合家具智能设计与制造系统开发。将有限元法应用于实木榫接合家具的结构设计中,将有助于实木榫接合家具的结构优化设计、智能设计与制造。 相似文献
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以现代实木家具中常见的45°斜角接合结构为研究对象,以实现斜角接合结构可拆装,提高其接合强度为目的,分析了现有斜角接合结构的特征与不足,提出一种通过五金连接件与分体榫相结合的45°斜角可拆装改良方案;采用有限元分析方法,从应力分布角度对现有节点和改良节点进行对比分析;通过力学试验方法测试了两种结构的抗弯力学性能。结果表明:改良方案的极限承载力平均值比现有方案高18.7%,通过有限元分析方法获得的节点应力云图与试验中试件的破坏形式具有较好的一致性。改良方案实现了斜角接合节点的可拆装,提高了实木家具斜角接合节点的强度,为后续进一步开发实木家具隐藏式五金连接件及榫卯外观下的节点可拆装设计提供了依据及实现方法。 相似文献
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板式家具熔化喷射式角接合强度的研究 总被引：1，自引：0，他引：1
通过试验对柜类家具熔化喷射式角接合与常规圆榫接合的强度进行了比较分析，并用有限元法对各种角接合的柜体在受载时的变形进行了预测。 相似文献
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基于Abaqus有限元分析,对不同榫长的实木榫卯连接梁柱节点和榫长为75 mm的不同层数的正交胶合木(CLT)榫卯连接梁柱节点进行数值模拟,分析其受力状态并提取荷载-位移曲线,与使用金属连接件连接的梁柱节点承载力进行对比,探究将榫卯连接应用在现代木结构中的理论依据。研究表明:竖向荷载作用下,榫长75 mm的榫卯连接梁柱节点承载能力处于M8和M10螺栓连接梁柱节点的理论承载力之间;当榫长增大时,节点的最大承载力逐渐提高,榫长150 mm的榫卯节点承载力已经略微超过M12螺栓连接时的理论承载强度,说明榫卯连接梁柱节点在承载能力上可以满足现代木结构建筑的使用要求。由于榫卯节点的承载力主要受到顺纹抗压强度的影响,因此相比于实木连接榫卯节点,CLT榫卯节点的承载力无显著提高。 相似文献
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Antonio Pantaleo Domenico Ferri Achille Pellerano 《Wood material science & engineering》2016,11(1):25-35
The research focuses on the assessment of the performances of glued laminated wood corner joints for outdoor window profiles applications, proposing a methodology to appreciate the strength of 90° tenon mortise corner joints. The rationale relies on the potential damage (i.e. breaking of the frame) that can be caused by poor glueing processes and/or typology of adhesives. There is a number of standards for assessment of wood-adhesive bonds for outdoor windows; however, there is a lack of specific standards related to glueing assessment for outdoor wood frames, which can take into account all the factors influencing the glueing quality. The proposed methodology was tested on red oak window profiles. A commercially available polyvinyl acetate-based adhesive was used for corner joints. Bending strength of 90° tenon mortise corner joints was measured and compared with maximum admissible loads on the frame to limit its deformations within admissible ranges. The test results show that the 90° tenon mortise corner joints strength exceeds the admissible load to preserve the functionality of the frame. In order to appreciate the influence of conditioning processes on adhesion, shear strength tests of the flatwise glued joint samples (bond lines of lamellae) were carried out after different conditioning processes. 相似文献
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木构建筑的榫卯结构作为我国传统文化的瑰宝,在现代建筑中应用广泛。笔者通过对现存木构建筑中榫卯的作用以及种类的分析,归纳了木构建筑中的几种常用的榫卯及其应用方式。通过查阅资料以及实地考察,分析了国内外建筑中榫卯的应用方法,归纳出榫卯结构在现代建筑的应用现状与发展前景。从榫卯的材料和结构方面出发,介绍了现阶段榫卯的创新发展现状,结合其在建筑中应用的方法与未来发展方向,提出了榫卯的创新方向及趋势。对榫卯进行应用分析并为未来的发展提供大致的方向,为今后榫卯的再设计奠定坚实的基础,有利于对其进行更好的传承和发展。 相似文献
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The beams and columns in Chinese ancient wooden buildings were connected with mortise–tenon joints, which are semi-rigid due to the friction and squeezing deformation between mortise and tenon. In this paper, a friction constitutive model for the friction behavior between mortise and tenon was proposed based on the modern frictional theory. A series of surface topography and hardness tests were conducted to obtain some parameters used in the friction constitutive model. A finite element (FE) model of a Chinese ancient wooden frame with mortise–tenon joints under reversed cyclic loading was performed based on the proposed friction constitutive model, and a FE model using a constant friction coefficient was also carried out. Experimental results were used to validate the results modeled by the two models, and better agreement of the proposed model was observed. 相似文献
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Finite element analysis of stress and strain distributions in mortise and loose tenon furniture joints 总被引：1，自引：0，他引：1
We studied the effect of loose tenon dimensions on stress and strain distributions in T-shaped mortise and loose tenon （M＆amp;LT） furni-ture joints under uniaxial bending loads, and determined the effects of loose tenon length （30, 45, 60, and 90 mm） and loose tenon thickness （6 and 8 mm） on bending moment capacity of M＆amp;LT joints constructed with polyvinyl acetate （PVAc） adhesive. Stress and strain distributions in joint elements were then estimated for each joint using ANSYS finite element （FE） software. The bending moment capacity of joints increased significantly with thickness and length of the tenon. Based on the FE analysis results, under uniaxial bending, the highest shear stress values were obtained in the middle parts of the tenon, while the highest shear elastic strain values were estimated in glue lines between the tenon sur-faces and walls of the mortise. Shear stress and shear elastic strain values in joint elements generally increased with tenon dimensions and corre-sponding bending moment capacities. There was consistency between predicted maximum shear stress values and failure modes of the joints. 相似文献
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Strength performance of mortise and loose-tenon furniture joints under uniaxial bending moment 总被引：2，自引：0，他引：2
We determined the effects of adhesive type and loose tenon dimensions （length and thickness） on bending strength of T-shaped mor- tise and loose-tenon joints. Polyvinyl acetate （PVAc） and two-component polyurethane （PU） adhesives were used to construct joint specimens. The bending moment capacity of joints increased significantly with increased length and thickness of the loose tenon. Bending moment capacity of joints constructed with PU adhesive was approximately 13% higher than for joints constructed with PVAc adhesive. We developed a predictive equation as a function of adhesive type and loose tenon dimensions to estimate the strength of the joints constructed of oriental beech （Fagus orientalis L.） under uniaxial bending load. 相似文献