共查询到19条相似文献,搜索用时 515 毫秒
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塑木复合材与木材主要力学性质的比较研究 总被引:9,自引:5,他引:4
分析了塑木复合材与木材的抗弯强度、抗弯弹性模量、抗压强度和抗剪强度之间的差异,结果表明,塑木复合材的抗弯性能远低于鹅掌楸(Liriodendron sp.)和速生杨木(Populussp.);纵向抗压强度也低于木材的顺纹抗压强度,横向抗压强度为木材横纹抗压强度的2.95倍(I-69杨)~3.74倍(鹅掌楸),纵向抗剪强度与木材的顺纹抗剪强度与木材相当.因此可采用降低密度、改进材料结构或改进材料成型方式来增加塑木复合材料的抗弯性能和纵向抗压性能,以扩大其应用范围. 相似文献
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目的研究塑料代替传统胶黏剂制得木塑复合材料的性能,及其在包装领域的应用特性。方法以桉木单板为原料,采用热压成形的方式,利用单因素分析热压温度和塑料种类对板材性能的影响,通过Ansys Workbench软件建立包装托盘的有限元模型,并分析其在静态弯曲条件下包装托盘的受力情况和承载特性。结果木塑复合板材的优化热压温度为180℃,此温度下所制得板材可满足II类胶合板的要求。9层复合板材制备的木塑托盘受到静载时托盘的上连板与中面板接触点的影响,左右两侧部位为破坏点,最大应力发生在上连板与中面板的接触位置。结论 HDPE和PVC等2种塑料薄膜代替传统胶黏剂所制备的板材符合国家标准,可应用于包装托盘的原材料。 相似文献
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根据纸质托盘结构及纸质运输包装材料的特点,提出了一种嵌入式底脚的纸质托盘结构。首先分析了嵌入式底脚与普通粘合式底脚的承载机理,研究发现,嵌入式底脚结构改善了普通粘合式底脚结构的承载方式。在横向载荷作用下,普通粘合式底脚承受剪切力作用只有一个承载面,总承载面积较小;嵌入式底脚承受多个面的剪切力及拉压力作用,承载总面积较大。随后,分别设计了开槽式、纸护角式两种嵌入式结构,并制备试样,对比分析了两种嵌入式底脚托盘与普通粘合式底脚托盘联结强度。研究表明,普通粘合式底脚横向承载能力较小;嵌入式底脚结构提高了底脚与托盘底板的胶粘面积及强度,能够承受更大的载荷及冲击力,新型结构是一种更可靠的纸质底脚与底板结合方式。 相似文献
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目的验证OSB板材能否用于托盘的制作,以及OSB板托盘在叉举过程中的应力应变情况。方法通过Solid Edge建立使用钢钉模型进行连接的OSB板托盘模型,并使用软件内的NX Nastran仿真模块对托盘模型进行有限元分析,得出托盘叉举工况下的应力应变分布图,同时对OSB板托盘进行叉举试验。结果通过对OSB板托盘进行有限元仿真分析和实际实验,得出在6.5 k N载荷下,仿真分析的最大变形量为16.75 mm,实际实验的最大变形量为18.2 mm,两者数值近似,验证了有限元分析的有效性。结论确认了OSB板托盘的实用性,以及在托盘设计阶段使用有限元法对托盘性能进行分析验证与优化的可行性。 相似文献
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木托盘受力性能理论分析及有限元模拟 总被引:2,自引:2,他引:0
目的对木托盘静载堆码时的力学性能进行理论分析和有限元模拟。方法建立木托盘顶铺板和纵梁板的力学模型,通过理论计算获得选用松木和杨木LVL 2种不同材料时的最大应力和最大挠度;按国家标准建立木托盘有限元模型,进行网格划分、施加载荷和约束后,获得选用松木和杨木LVL 2种不同材料时的最大等效应力值和最大变形量,并与理论分析结果进行对比。结果理论分析和有限元分析结果规律一致,最大应力均出现在中间纵梁板上,最大变形均发生在顶铺板上,且数值差距较小,2种分析方法均合理可行。结论该研究为木托盘的性能分析提供了有效的方法。 相似文献
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木托架由纵横木交错组合而成,主要用于冷轧薄钢板材的堆码和起吊,并且在起吊工况中易损坏。以冷轧薄钢板材的起吊工况为启示,分析了起吊工况下的三纵木冷轧薄钢钢板材托架的受力情况,论述了起吊动载荷对木托架弯曲强度的影响,在此基础上,得出了不同横木情况下,纵木的最大弯曲强度理论公式。为不同规格和载重的冷轧薄钢板木托架结构设计提供理论依据。 相似文献
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This paper presents the application of an innovative method of optimization to the design of an I-shape profile used in a wood–plastic composite (WPC) pallet. The pallet was made via assembling three WPC extruded profiles manufactured in the extrusion process. The middle profile was considered to be I-shaped, a design which known to have a high load bearing capability. However, due to the characteristics of WPC products, a delicate design and thus optimization is highly required. A multi-objective-optimization program of micro-genetic algorithm was developed in Visual Basic environment to accomplish the optimization task. By specifying the dimensional variables of the profile section and applying finite elements analysis on the profile and then using the optimization program, an optimal profile section was obtained. The objective was to withstand the maximum load while yielding the minimum deflection and mass. The optimized design was used to manufacture a die and then the product was produced to validate the design. The comparison of simulations and experimental results indicted that the given design method is reasonably reliable. The final mass of the produced pallet was less than 20 kg whereas its strength against bending and distributed smooth restraint loading were greater than 500 kg and 2000 kg, respectively. 相似文献
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薄钢板材包装用木托架的受力分析和结构优化 总被引:3,自引:3,他引:0
基于薄钢板材运输包装木托架的合理设计要求,分析了流通环境中的薄钢板材包装木托架的具体工况,进行了典型工况下木托架的受力分析,建立了相应的力学模型。根据力学模型对木托架的尺寸和结构进行了优化,初步获得了兼顾木托架承载性能与成本的设计方法。 相似文献
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Chandler Quesenberry Laszlo Horvath John Bouldin Marshall S. White 《Packaging Technology and Science》2020,33(12):547-558
During unitized shipment, the components of unit loads are interacting with each other. During floor stacking of unit loads, the load on the top of the pallet causes the top deck of the pallet to bend, which creates an uneven top deck surface resulting in uneven or asymmetrical support of the corrugated boxes. This asymmetrical support could significantly affect the strength of the corrugated boxes, and it depends on the top deck stiffness of the pallet. This study is aimed at investigating how the variations of pallet top deck stiffness and the resulting asymmetric support affect corrugated box compression strength. The study used a scaled-down unit load compression test on quarter-scale pallet designs with different deckboard thicknesses using four different corrugated box designs. Pallet top deck stiffness was determined to have a significant effect on box compression strength. There was a 27%–37% increase in box compression strength for boxes supported by high-stiffness pallets in comparison with low-stiffness pallets. The fact that boxes were weaker on low-stiffness pallets could be explained by the uneven pressure distribution between the pallet deck and bottom layer of boxes. Pressure data showed that a higher percentage of total pressure was located under the box sidewalls that were supported on the outside stringers of low-stiffness pallets in comparison with high-stiffness pallets. This was disproportionately loading one side of the box. Utilizing the effects of pallet top deck stiffness on box compression performance, a unit load cost analysis is presented showing that a stiffer pallet can be used to carry boxes with less board material; hence, it can reduce the total unit load packaging cost. 相似文献
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Eduardo Molina Laszlo Horvath Marshall S. White 《Packaging Technology and Science》2018,31(10):653-663
Considering the effect of packages during pallet design will reduce costs and improve the sustainability of supply chains. Currently, many mechanical interactions between the pallet and the package product are not being considered during the pallet design process. This study investigates the effect of the magnitude and type of interlocking between layers of packaged products. The bending of the pallet supporting a unit load of corrugated boxes was measured under four common support conditions, warehouse rack storage spanning the pallet width and length, fork tine support across the pallet width, and floor stacking. Five different pallet stacking patterns were analyzed from column stacking to fully interlocked stacking. It was determined that interlocking packages reduces pallet deflection up to 53%. This is more significant for lower stiffness pallets and when the payload carried by the pallet is greater than the rated load capacity of the pallet. Increasing the magnitude of the interlocking reduces the deflection of the pallet by 11.6%. These results provide a guideline on improving pallet design and help further the understanding of the interaction between pallets and the orientation of packaged products placed on the pallet. 相似文献
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目的 以木质平托盘为对象,通过有限元仿真和试验分析影响木质平托盘抗冲击性能的主要因素。方法 用SolidWorks建立木质平托盘的3D模型,利用Abaqus有限元软件,以GB/T 4996—2014为依据进行角跌落试验仿真,分析木质平托盘上木质构件以及托盘钉上产生的应力和位移。为了进行对比,在实验室进行木质平托盘产品的角跌落试验,观察木质平托盘的破坏形式,并测量其对角线长度。结果 有限元仿真与实验室实物试验结果相吻合,验证了有限元仿真分析的正确性和有效性。有限元仿真分析发现钉孔处木质构件和托盘钉产生应力集中并逐渐发生塑性变形,且应力和变形数值随跌落次数的增加而增大,仿真和试验均表明跌落侧纵梁向内侧凹陷且变形最为明显,木质平托盘对角线变化量受跌落次数逐渐变大。结论 木质平托盘抗冲击性能随跌落次数的增加而下降。木质平托盘中木质构件、托盘钉的性能,以及托盘钉紧固件与木质构件的连接强度是决定木质平托盘抗冲击性能的关键因素。 相似文献