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Mechanical Character Analysis of Pineapple Fibre Epoxy Composite with Nanoclay Quantity Variation 纳米粘土用量变化下菠萝纤维-环氧树脂复合材料力学性能分析
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-10-03 DOI: 10.37358/mp.22.3.5614
P. Murthy, S. Bojan, S. Krishnasamy
Epoxy based hybrid composites are extremely wide used materials in the polymer engineering field and always have a demand for their versatile applications. Nano clay is yet another trending substance handled by many researchers due to their enhanced abrasion characteristics. This research was performed to investigate the effect of dispersing nanoclay into epoxy matrix and further coupled with pineapple fibers to fabricate a hybrid composite of excellent mechanical property. 4 layers of Pineapple fiber mats were compression moulded with epoxy nanoclay blend to obtain composite specimens of 4mm thickness. Nanoclay was added into epoxy resin at four different weight ratios (2%, 4%, 6%, and 8%) to form four different combinations of matrix materials into which pineapple fiber mats were reinforced individually at a constant weight ratio of 25%. The enhancement of mechanical and abrasion rate of the hybrid composites were matched with those of the neat Epoxy/Pineapple fiber composites that are currently being developed as alternatives for brake pads. Moisture absorption rate of the composites were analysed to ASTM D570 and Morphology was inspected using Field Emission Scanning Electron Microscope (FESEM). The results depicted optimum mechanical performance at 4 wt% nanoclay infused epoxy/pineapple fiber composite that had a tensile strength of 166.75 MPa, flexural strength of 801.15 MPa and impact strength of 148.76 kg/sq. m. The least abrasion rate was detected in the composite with 8 wt% nanoclay content, resulting in an abrasion rate of 0.1064 g/m.
环氧基杂化复合材料是聚合物工程领域中应用极为广泛的材料,对其多功能应用一直有需求。纳米粘土由于其增强的磨损特性,是许多研究人员处理的另一种趋势物质。本研究旨在研究将纳米粘土分散到环氧树脂基体中,并与菠萝纤维进一步偶联,制备出力学性能优异的杂化复合材料的效果。用环氧纳米粘土混合物对4层菠萝纤维垫进行模压,以获得4mm厚度的复合试样。将纳米粘土以四种不同的重量比(2%、4%、6%和8%)添加到环氧树脂中,以形成四种不同基质材料组合,其中菠萝纤维垫以25%的恒定重量比单独增强。混合复合材料的机械性能和耐磨性的提高与目前正在开发的纯环氧树脂/菠萝纤维复合材料相匹配,后者是刹车片的替代品。根据ASTM D570分析复合材料的吸湿率,并使用场发射扫描电子显微镜(FESEM)检查形态。结果表明,在4wt%纳米粘土注入的环氧树脂/菠萝纤维复合材料下,其最佳机械性能为166.75MPa的拉伸强度、801.15MPa的弯曲强度和148.76kg/sq.的冲击强度。m.在具有8wt%纳米粘土含量的复合材料中检测到最小的磨损率,导致0.1064g/m的磨损率。
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引用次数: 0
Study of the Vibrations of Some Composite Bars with Polypropylene Honeycomb Core and Carbon Fiber and Fiberglass Fabric Faces 聚丙烯蜂窝芯与碳纤维、玻璃钢面复合杆的振动研究
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-10-03 DOI: 10.37358/mp.22.3.5601
A. Bolcu, M. Stănescu, D. Bolcu, I. Ciuca, M. Bogdan, A. Diniță, N. Sârbu
The paper generalizes the Timoshenko model for thick bars, using a new model that is applied to the vibration study of multilayer composite bars. In the proposed mathematical model, three coefficients are introduced that take into account the non-uniformities of the tangential and normal stresses in the bar section. The vibrations of some composite bars with a polypropylene honeycomb core with a thickness of 10 mm, 15 mm and 20 mm are experimentally studied, on the faces of which one or two layers of carbon fiber, respectively glass fiber was poured. For each analysed bar, the stiffness and the equivalent modulus of elasticity are determined and the variation of the damping coefficient according to the length of the bar is studied.
本文对厚筋的Timoshenko模型进行了推广,提出了一种新的模型,并将其应用于多层复合筋的振动研究。在提出的数学模型中,引入了考虑杆截面切向应力和法向应力不均匀性的三个系数。对10 mm、15 mm和20 mm厚度的聚丙烯蜂窝芯复合棒的振动进行了实验研究,在蜂窝芯表面分别浇筑一层碳纤维和两层玻璃纤维。对所分析的每根杆确定了刚度和等效弹性模量,并研究了阻尼系数随杆长变化的规律。
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引用次数: 0
Quasi Static and Dynamic Mechanical Analysis of 3D Printed ABS and Carbon Fiber Reinforced ABS Composites 3D打印ABS及碳纤维增强ABS复合材料的准静态和动态力学分析
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-10-03 DOI: 10.37358/mp.22.3.5613
Vigneshwaran Karupaiah, V. Narayanan, Naresh Kakur
Fused Filament Fabrication (FFF) is the most popular and widely used additive manufacturing process for printing polymer and composite products. Various production factors influenced the strength and stiffness of the part manufactured by 3D printing. A comprehensive experimental analysis was conducted in this study to examine the effect of FFF process parameters (infill density, pattern, and layer thickness) on mechanical properties and failure mechanism. The tensile, flexural, and impact test specimens were printed using ABS and carbon fibre reinforced ABS filaments in accordance with ASTM standards. Furthermore, dynamic properties are studied using dynamic mechanical analysis to estimate the loss factor and glass transition temperature under the impact of temperature and frequency in addition to static properties. Further, the results showed the addition of carbon fiber in ABS increases the mechanical properties. The failure modes are studied using optical microscopy and Scanning Electron Microscopy images and it has been visualized that due to improper layer deposition, poor bonding between the previous layer and low infill density creates a void in the specimen which results in poor mechanical properties. The Dynamic Mechanical Analysis showed that at higher frequency the molecular movement decreases which in turn stabilizes the composite behavior and reduces the loss factor.
熔融长丝制造(FFF)是打印聚合物和复合材料产品中最流行和应用最广泛的增材制造工艺。各种生产因素会影响3D打印制造的零件的强度和刚度。本研究对FFF工艺参数(填充密度、花纹、层厚)对力学性能和破坏机理的影响进行了综合实验分析。拉伸、弯曲和冲击试验试样按照ASTM标准使用ABS和碳纤维增强ABS长丝进行打印。此外,除了静态性能外,还利用动态力学分析方法研究了在温度和频率影响下的损耗因子和玻璃化转变温度。结果表明,碳纤维的加入提高了ABS的力学性能。利用光学显微镜和扫描电镜图像研究了失效模式,可以看出,由于层沉积不当,前一层之间的结合不良,填充密度低,在试样中产生空洞,导致力学性能差。动态力学分析表明,在较高的频率下,分子运动减少,从而稳定了复合材料的行为,降低了损失因子。
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引用次数: 0
The Application of N, N -bis(Isonicotinic Acid) 1, 4-Naphthalenedicarboxylic Acid Dihydrazide in Biodegradable Poly(L-lactide): Crystalline Nucleation, Melting Behavior, Thermal Stability and Mechanical Properties N, N -二(异烟酸)1,4 -萘二羧酸二肼在可生物降解聚l -丙交酯中的应用:结晶成核、熔融行为、热稳定性和力学性能
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-10-03 DOI: 10.37358/mp.22.3.5617
H. Xia, Yan-Hua Cai, Jia-ling Wang, Hao Huang, Lisha Zhao
Improving the crystallization performance of poly(L-lactide) (PLLA) is necessary to adapt for various applications. In the current work, N, N -bis(isonicotinic acid) 1, 4-naphthalenedicarboxylic acid dihydrazide (NAIAH) was synthesized to be firstly aimed at promoting the crystallization of PLLA, and the NAIAH-nucleated PLLA materials were prepared using PLLA as a matrix material and NAIAH as a nucleating agent, and the crystalline nucleation, melting behavior, thermal decomposition and mechanical properties of PLLA/NAIAH samples were investigated by the relevant testing instruments. The results from the non-isothermal melt-crystallization from the melt of 190oC indicated that the NAIHA could significantly accelerate PLLA�s crystallization, and played an efficient heterogeneous nucleation in PLLA�s crystallization. The effect of different final melting temperatures on PLLA�s melt-crystallization behavior showed that a relatively low final melting temperature was beneficial for the crystallization of PLLA, and the 170oC was the optimum final melting temperature in this study. An increase of cooling rate could weaken PLLA/NAIAH�s crystallization ability, but the NAIAH was still able to promote PLLA�s crystallization upon the fast cooling at 50oC/min, showing a powerful crystallization accelerating effect of NAIAH. PLLA/NAIAH�s melting behaviors after different crystallization conditions were affected by heating rate and crystallization temperature, and the double melting peaks appeared in melting DSC curves were assigned to melting-recrystallization. Thermal decomposition processes in air showed that the NAIAH decreased PLLA�s thermal stability, but the interaction of PLLA with NAIAH had an inhibition for a drop in onset decomposition temperature. Additionally, the introduction of NAIAH dramatically reduced PLLA�s tensile modulus and elongation at break.
提高聚L-丙交酯(PLLA)的结晶性能是适应各种应用的必要条件。在本工作中,首次以促进PLLA结晶为目标合成了N,N-双(异烟酸)1,4-萘二羧酸二酰肼(NAIAH),并以PLLA为基体材料和NAIAH为成核剂制备了NAIAH成核PLLA材料,利用相关测试仪器对PLLA/NAIAH样品的热分解和力学性能进行了研究。从190℃的熔体中非等温熔体结晶的结果表明,NAIHA可以显著加速PLLA�s结晶,并在PLLA中发挥了有效的非均匀成核作用�s结晶。不同终熔温度对PLLA的影响�s的熔融结晶行为表明,相对较低的最终熔融温度有利于PLLA的结晶,170℃是本研究中的最佳最终熔融温度。冷却速度的增加可能会削弱PLLA/NAIAH�的结晶能力,但NAIAH仍然能够促进PLLA�在50℃/分钟的快速冷却下结晶,显示出NAIAH强大的结晶加速作用。PLLA/NAIAH�s在不同结晶条件下的熔融行为受到加热速率和结晶温度的影响,熔融DSC曲线中出现的双熔融峰属于熔融再结晶。空气中的热分解过程表明NAIAH降低了PLLA�s的热稳定性,但PLLA与NAIAH的相互作用对起始分解温度的下降具有抑制作用。此外,NAIAH的引入大大降低了PLLA�s拉伸模量和断裂伸长率。
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引用次数: 0
Internal Pressure Test on HDPE Pipe Ring HDPE管环的内压试验
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-10-03 DOI: 10.37358/mp.22.3.5603
Ioana-Daniela Manu
The purpose of experiment was the highlight of the creep of ring from polyethylene pipe subjected to internal pressure. To create the internal pressure in the HDPE pipe ring, a weight of 4.5 kg was superimposed on it, in the form of a cylindrical plate. In order to evaluate the strains of the elastic element subjected to the tensile stress, respectively compression, tensometric marks 1 and 2 are placed on the outside, in the case of the circular section. The internal pressure test was performed to evaluate the strains of the material of a PE 100 polyethylene ring in two directions: one axial (longitudinal) and the other transverse (circumferential) in order to highlight the creep of the pipe material due to its structure. In a polyethylene pipe stressed at internal pressure, due to the symmetry the tangential stresses are zero. The axial strain initially showed a positive increase, followed by a decrease, reaching negative values towards the end of the experiment, while the circumferential strain recorded positive values, about 300 times higher than the initial ones. The principal stress changed approximately linearly. The circumferential stress recorded the maximum value of σ1=0.33 MPa (3.3 bar) after two and a half hours of experiment. Based on such this test could be calculate Poisson s ratio ν.
实验的目的是突出聚乙烯管环在内压作用下的蠕变。为了在HDPE管环中产生内部压力,将4.5kg的重量以圆柱形板的形式叠加在其上。为了评估弹性元件在分别受到拉伸应力和压缩的情况下的应变,在圆形截面的情况下,在外侧放置张力标记1和2。进行内压试验以评估PE 100聚乙烯环材料在两个方向上的应变:一个轴向(纵向),另一个横向(周向),以突出管道材料由于其结构而产生的蠕变。在内部压力下受力的聚乙烯管道中,由于对称性,切向应力为零。轴向应变最初显示出正增加,然后下降,在实验结束时达到负值,而周向应变记录到正值,比初始应变高出约300倍。主应力近似线性变化。在两个半小时的实验后,周向应力记录了σ1=0.33 MPa(3.3 bar)的最大值。在此基础上,可以计算泊松比。
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引用次数: 0
Effect of Certain Hydrocarbon Compounds on High-density Polyethylene Water Pipes 某些碳氢化合物对高密度聚乙烯水管的影响
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-10-03 DOI: 10.37358/mp.22.3.5608
Antypas Imad Rezakalla, Dyachenko Alexey Gennadyevech
Plastic pipes are being more widely used in various industries, as they combine both a rather light weight and quite high physical mechanical performance characteristics. The present article materials are devoted to the researches, relating to the determination of the various hydrocarbon compounds effect on some mechanical properties reduction degree of samples cut from HDPE pipes, represented by characteristic values of curves (strength - tensile strain) as an absorption result. In the course of the research, the gasoline presence in material structure of the pipe samples was noted to make the process unstable, and the curves representing a change in the characteristic values under study, depending on the immersion time in diesel fuel, tended to decrease throughout the entire immersion period. The experiments have shown that in the study of samples absorbing capacity a full saturation was obtained when immersed in diesel fuel and, despite large difference in absorbance values, the volume of absorbed hydrocarbons caused decline close to the studied characteristic values. Motor oils produced the most significant effect on the HDPE samples studied characteristics at the relatively low absorption values.
由于塑料管道具有重量轻、物理机械性能高的特点,因此在各个行业中得到了越来越广泛的应用。本文研究了各种碳氢化合物对HDPE管材切割样品的某些力学性能降低程度的影响,以曲线特征值(强度-拉伸应变)作为吸收结果。在研究过程中,注意到汽油存在于管道样品的材料结构中,使过程不稳定,并且所研究的特征值随柴油浸泡时间的变化曲线在整个浸泡期间呈下降趋势。实验表明,样品浸泡在柴油中吸收能力达到完全饱和,尽管吸光度值差异较大,但吸收的碳氢化合物体积在接近研究特征值时下降。在相对较低的吸收值下,机油对HDPE样品特性的影响最为显著。
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引用次数: 0
High-density Polyethylene - Expanded Perlite Composites: Structural Oriented Analysis of Mechanical and Thermomechanical Properties 高密度聚乙烯-膨胀珍珠岩复合材料:机械和热机械性能的结构取向分析
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-10-03 DOI: 10.37358/mp.22.3.5605
M. Barczewski, A. Hejna, P. Kosmela, O. Mysiukiewicz, A. Piasecki, Kamila Sa�asi�ska
As part of this work, research was carried out on the effect of the addition of expanded perlite (PR) on the mechanical and thermomechanical properties of high-density polyethylene (PE) composites. Composites containing from 1 to 10 wt% of the inorganic filler were produced. Polyethylene-based composites manufactured by twin-screw extrusion and formed in the compression molding process were subjected to mechanical, thermomechanical, and structural analyses. The structure of polymer composites and filler was analyzed using scanning electron microscopy (SEM). It has been correlated with the static tensile tests and results of dynamic thermomechanical analysis (DMA). As part of the work, several thermomechanical parameters were calculated, and the obtained results were discussed with the evaluation of interfacial adhesion based on microscopic analysis. The research showed that despite introducing a 10 wt% of particle-shaped filler, the composites show increased stiffness without noticeable deterioration in tensile strength, simultaneously reducing toughness and brittleness. The analysis of the thermomechanical properties showed the lack of significant effects of the filler influence on the polymer matrix.
作为这项工作的一部分,研究了膨胀珍珠岩(PR)的加入对高密度聚乙烯(PE)复合材料的机械和热机械性能的影响。复合材料含有1 ~ 10 wt%的无机填料。通过双螺杆挤压和压缩成型工艺制造的聚乙烯基复合材料进行了力学、热力学和结构分析。利用扫描电子显微镜(SEM)分析了聚合物复合材料和填料的结构。它与静态拉伸试验和动态热力分析(DMA)结果相关联。作为工作的一部分,计算了几个热力学参数,并对所得结果与基于微观分析的界面附着力评价进行了讨论。研究表明,尽管引入了10 wt%的颗粒状填料,复合材料的刚度增加而抗拉强度没有明显下降,同时降低了韧性和脆性。热力学性能分析表明,填料对聚合物基体的影响不明显。
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引用次数: 1
Metal-containing Ionic Liquids as Catalyst in PET Glycolysis 含金属离子液体在PET糖酵解中的催化作用
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-10-03 DOI: 10.37358/mp.22.3.5612
Robert Țincu, A. Slabu, C. Stavarache, M. Duldner, Emeric Barth, F. Teodorescu
Metal-containing ionic liquids with general formula [Rmim]+MX3- (R=n-butyl or n-lauryl; M=Zn, Cd; X=Cl, Br) were synthesised and then characterized by nuclear magnetic resonance spectroscopy and infrared spectroscopy. The catalytic activity was tested in glycolysis of poly(ethylene terephthalate) (PET) with ethylene glycol (EG) with the main product being bis-2-hydroxyethyl terephthalate (BHET). The following parameters were varied: the catalyst type, the catalyst loading and the molar ratio between PET and EG. For every reaction conversion and selectivity were calculated. All these reactions arose with high selectivity in the desired product, the conversion of PET being quasi-total.
合成了通式为[Rmim]+MX3-(R=正丁基或正十二烷基;M=Zn,Cd;X=Cl,Br)的含金属离子液体,并用核磁共振光谱和红外光谱对其进行了表征。研究了聚对苯二甲酸乙二醇酯(PET)与乙二醇(EG)的糖酵解反应,主要产物为对苯二甲酸二-2-羟基乙酯(BHET)。以下参数是可变的:催化剂类型、催化剂负载量以及PET和EG之间的摩尔比。对于每个反应,计算转化率和选择性。所有这些反应在所需产物中以高选择性产生,PET的转化率为准全。
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引用次数: 1
CONTENTS Nr. 3 / 2022 总目录第3/2022号
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-10-03 DOI: 10.37358/mp.22.3.5600
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引用次数: 0
The Tribology of Composite Materials Used for Manufacturing Brake Shoes 制造刹车片用复合材料摩擦学研究
IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2022-10-03 DOI: 10.37358/mp.22.3.5602
F. Bucur, A. Socalici, A. B. Berghian, C. B. Baneasa, L. Pascu
The paper presents the results obtained after the tribology of composite materials with organic components intended for the manufacturing of brake shoes for motor and towed rolling stock. We analyzed the tribological behaviour of the samples of experimental composite material in comparison to the phosphorous cast iron frequently used for manufacturing brake shoes.
本文介绍了用于制造汽车和牵引车辆制动蹄片的有机成分复合材料的摩擦学研究结果。我们分析了实验复合材料样品的摩擦学行为,并与经常用于制造制动蹄片的磷铸铁进行了比较。
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引用次数: 1
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