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Investigation of shear thickening fluid (STF) impregnated interlayer hybrid composites under low-velocity impact loading 低速冲击载荷下剪切增稠液(STF)浸渍层间混合复合材料的研究
IF 2.9 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-08-17 DOI: 10.1177/00219983241274552
Canan Saricam, Nazan Okur
This study deals with the development of interlayer hybrid composites with improved low-velocity impact response. In the composites produced using the hand lay-up technique, glass, carbon, and Kevlar woven fabrics were used as reinforcement materials and epoxy resin was used as the matrix material. Shear thickening fluid (STF) was impregnated into the fabric for enhancing their performance. The effect of hybridization with different stacking sequences and the impregnation of STF on the peak load, deflection at peak load, energy absorption, impact strength, and damage degree were investigated. All samples were subjected to 3.12 m/s and 4.42 m/s impact velocities using a drop-weight impact tester applying 200J and 400J impact energy levels, respectively. The results revealed that in samples containing neat fabrics, the performances of the pure Kevlar samples were much better in comparison to hybrid samples, especially under high impact energy. However, STF significantly improved the impact strength and energy absorption (up to 30 times) of all samples, including hybrid ones. On the other hand, as the impact energy increased, the use of a Kevlar reinforced plate on the impact surface was crucial, providing higher energy absorption, and no perforation was observed since most of the energy was required to initiate the damage. In the samples with Kevlar in the intermediate layer, however, the majority of the impact energy caused propagation and expansion of the damage. According to the findings, up to 50% cost savings were achieved in STF-impregnated hybrid samples containing Kevlar.
本研究涉及开发具有更佳低速冲击响应的层间混合复合材料。在采用手糊技术生产的复合材料中,玻璃纤维、碳纤维和凯夫拉纤维编织物被用作增强材料,环氧树脂被用作基体材料。织物中浸渍了剪切增稠液(STF),以提高其性能。研究了不同堆叠顺序的杂化和 STF 的浸渍对峰值载荷、峰值载荷挠度、能量吸收、冲击强度和损伤程度的影响。使用落锤式冲击试验机分别对所有样品施加 3.12 m/s 和 4.42 m/s 的冲击速度,并施加 200J 和 400J 的冲击能量水平。结果表明,在含有纯织物的样品中,纯 Kevlar 样品的性能要比混合样品好得多,尤其是在高冲击能量下。然而,STF 能显著提高所有样品(包括混合样品)的冲击强度和能量吸收能力,最高可达 30 倍。另一方面,随着冲击能量的增加,在冲击面上使用凯夫拉纤维加固板至关重要,可提供更高的能量吸收,而且由于大部分能量都需要用来引发破坏,因此没有观察到穿孔现象。然而,在中间层使用凯夫拉纤维的样品中,大部分冲击能量都会导致损坏的扩展和扩大。根据研究结果,含有 Kevlar 的 STF 浸渍混合样品最多可节省 50% 的成本。
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引用次数: 0
Effect of pre-curing on thermoplastic-thermoset interphases 预固化对热塑性塑料-热固性塑料相间性的影响
IF 2.9 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-08-14 DOI: 10.1177/00219983241271007
Adam Fisher, Arjun Radhakrishnan, Arthur Levy, Julie Teuwen, James Kratz
This study considered adhesion between thermoplastic and thermoset laminates through interdiffusion at the interface. The influence of the degree of cure of the thermoset at the start of the process was investigated through mechanical testing and microscopy. Increasing the initial degree of cure decreased both interlaminar fracture toughness and interphase thickness. Fracture toughness decreased disproportionately to interphase thickness, attributed to changes in interphase morphology and decreasing surface contact at the interface. A simplified model was developed using gel layer thickness measurement data to predict the level of interdiffusion with increasing initial degree of cure. Compared to thermoset-thermoset co-curing, there was superior bond strength at low initial degrees of cure and a predicted increased sensitivity to the initial degree of cure, suggesting a greater influence of process variability. Hence, for specific property critical applications, the trade-off between the potential manufacturing efficiency gains from semi-curing and the reduced performance would be an important consideration.
本研究考虑了热塑性塑料和热固性塑料层压板之间通过界面相互扩散产生的粘合力。研究通过机械测试和显微镜检查了热固性塑料在工艺开始时固化程度的影响。提高初始固化度会降低层间断裂韧性和相间厚度。断裂韧性的降低与相间厚度不成比例,这归因于相间形态的变化和界面表面接触的减少。利用凝胶体层厚度测量数据建立了一个简化模型,以预测随着初始固化度的增加,相互扩散的程度。与热固性-热固性共固化相比,低初始固化度下的粘接强度更佳,而且预测对初始固化度的敏感性更高,这表明工艺变异的影响更大。因此,对于特定的关键性能应用,如何权衡半固化可能带来的生产效率提高和性能降低是一个重要的考虑因素。
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引用次数: 0
Epoxy resin reinforced with carbonized chicken feathers: An innovative composite material with sustainable potentials 用碳化鸡毛增强环氧树脂:具有可持续发展潜力的创新复合材料
IF 2.9 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-08-13 DOI: 10.1177/00219983241276933
Segun I Talabi, Wonders Oladipo, Iyanuoluwa Odetoyinbo, Akash Phadatare, Sana Elyas, Uday Vaidya, Ahmed A Hassen
This article explores a novel method for enhancing the mechanical properties of epoxy resin composites by incorporating carbonized chicken feathers as a filler material. The fabrication process involves carbonizing chicken feathers at 600°C and incorporating 5-10 wt% of the fillers into an epoxy matrix. The composites showed enhanced mechanical properties and samples containing 10 wt% filler exhibit the best properties. The performance corresponds to 49% increase in tensile strength, 16% rise in Young’s modulus, 40% improvement in flexural modulus, and 57% in flexural strength. X-ray diffraction and scanning electron microscopy with energy dispersive spectroscopy were employed to characterize the filler. This characterization provides valuable insights into the structure and chemical composition of the pulverized carbonized chicken feathers that contributed to the attained improvement in composites’ properties. Microstructural examination of the developed composite under scanning electron microscope also provides insights into matrix-filler interface and dispersion of the fillers within the composite matrix. The study not only highlights the unique combination of carbonized feathers’ inherent strength and compatibility with the epoxy matrix but also underscores the eco-friendly nature of utilizing agricultural waste. The findings suggest promising applications in industries demanding lightweight, high-strength materials, which can contribute to sustainable engineering solutions.
本文探讨了一种通过加入碳化鸡毛作为填充材料来增强环氧树脂复合材料机械性能的新方法。制造过程包括在 600°C 下对鸡毛进行碳化,并在环氧基体中加入 5-10 wt%的填料。复合材料显示出更强的机械性能,而含有 10 wt% 填料的样品性能最佳。其性能相当于拉伸强度提高了 49%,杨氏模量提高了 16%,弯曲模量提高了 40%,弯曲强度提高了 57%。X 射线衍射和扫描电子显微镜与能量色散光谱法被用来表征填料。这种表征为了解碳化鸡毛的结构和化学成分提供了有价值的信息,而碳化鸡毛的结构和化学成分有助于提高复合材料的性能。在扫描电子显微镜下对所开发的复合材料进行的微观结构检查还有助于深入了解基体-填料界面以及填料在复合材料基体中的分散情况。这项研究不仅突出了碳化羽毛的固有强度和与环氧树脂基体的兼容性的独特组合,还强调了利用农业废弃物的生态友好性质。研究结果表明,这种材料有望应用于需要轻质高强度材料的行业,从而为可持续工程解决方案做出贡献。
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引用次数: 0
Characterisation of 3D woven textile composites in presence of minor weft tow undulations and cross-section variations 存在微小纬纱束起伏和截面变化的三维纺织复合材料的特性分析
IF 2.9 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-08-13 DOI: 10.1177/00219983241270939
Mingming Xu, Elena Sitnikova, Weiyi Kong, Jian Zhang, Shoufeng Hu, Shuguang Li
Weft tows in 3D woven composites are commonly approximated as perfectly straight, but their undulations are inevitable in reality, although the extent of undulations in the weft tows is not as pronounced as in the warp tows. Such minor undulations in weft tows have been simulated in this paper. A previously established parametrised modelling and analysis tool for 3D woven composites has been extended to reproduce the varying geometry of the weft tows. Two novel models have been proposed to introduce the undulations, allowing their effects to be simulated. The analysis reveals that, compared to the model with straight weft tows, the effective elastic properties can be affected by the weft tow undulations. In addition, the procedure for defining varying intra-tow fibre orientation was formulated and implemented, addressing lack of consistent and robust functionalities of this kind in modern finite element solvers.
在三维编织复合材料中,纬向丝束通常被近似为完全平直的,但其起伏在现实中是不可避免的,尽管纬向丝束的起伏程度不如经向丝束明显。本文模拟了纬纱束中的这种微小起伏。以前建立的用于三维编织复合材料的参数化建模和分析工具已得到扩展,以再现纬向丝束的不同几何形状。本文提出了两个新模型来引入起伏,从而模拟其影响。分析表明,与直纬纱束模型相比,有效弹性特性会受到纬纱束起伏的影响。此外,还制定并实施了定义不同纬束内纤维取向的程序,解决了现代有限元求解器中此类功能缺乏一致性和稳健性的问题。
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引用次数: 0
Advancements in joining Al-Zn-TiC-Mg composites using friction stir welding process: Influence of traverse speed 使用搅拌摩擦焊工艺连接铝锌钛镁复合材料的进展:横移速度的影响
IF 2.9 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-08-07 DOI: 10.1177/00219983241274502
Amin Abdollahzadeh, Behrouz Bagheri Vanani, Abbas Masoudi Morghmaleki, Ahmad Ostovari Moghaddam, Ali Reza Eivani
In this article, dissimilar magnesium and aluminum alloys were welded with a Zn interlayer and TiC nanoparticles by friction stir welding. Optimal joining conditions were achieved by a combination of three traverse speeds (30, 45, and 60 mm/min) and constant rotational speeds (1050 rpm). The best microstructure evolution and mechanical properties were achieved for specimens joined at rotational and traverse speeds of 1050 rpm and 45 mm/min, respectively. The grain size decreases as the traverse speed increases from 30 to 45 mm/min due to a reduction in heat input, an improvement in reinforcing distribution, and high intermixing of materials, then increases from 45 to 60 mm/min due to inadequate heat input for recrystallization process. It was shown that the TiC particles play a prominent role in the microstructure modification and enhance mechanical properties of weld samples while the Zn foil interlayer plays a vital in avoiding the formation of Al-Mg IMC phases. The obtained result under optimal welding parameters indicates that MgZn2, Mg-Al-Zn compounds, Mg and Al solid solution, were the main detected common phases in the stir zone instead of the brittle and hard Al-Mg IMCs formation. The average hardness values of 232 Hv were achieved, while the strength of the weld specimen experiences the 189 MPa value. In addition, a combination of brittle and ductile modes was observed based on the fracture surface of the weld sample after the tensile test.
本文通过搅拌摩擦焊焊接了带有 Zn 夹层和 TiC 纳米粒子的异种镁铝合金。三种横移速度(30、45 和 60 毫米/分钟)和恒定转速(1050 转/分钟)的组合达到了最佳焊接条件。分别以 1050 转/分钟和 45 毫米/分钟的旋转和横移速度焊接的试样获得了最佳的微观结构演变和机械性能。随着横移速度从 30 mm/min 增加到 45 mm/min,晶粒尺寸减小,这是由于热量输入减少、增强分布改善以及材料混合程度高所致;然后,由于再结晶过程热量输入不足,晶粒尺寸从 45 mm/min 增加到 60 mm/min。结果表明,TiC 颗粒在焊接样品的微观结构改良和机械性能提高方面发挥了重要作用,而 Zn 箔夹层在避免形成 Al-Mg IMC 相方面发挥了关键作用。最佳焊接参数下获得的结果表明,MgZn2、Mg-Al-Zn 化合物、Mg 和 Al 固溶体是搅拌区中主要检测到的常见相,而不是脆而硬的 Al-Mg IMC。焊接试样的平均硬度值达到 232 Hv,强度值达到 189 MPa。此外,根据拉伸试验后焊接试样的断裂面,还观察到脆性和韧性模式的结合。
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引用次数: 0
An experimental investigation of nano clay and functionalized nano graphene oxide effects on ablation of carbon/phenolic nanocomposites 纳米粘土和功能化纳米氧化石墨烯对碳/酚类纳米复合材料烧蚀效应的实验研究
IF 2.9 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-08-07 DOI: 10.1177/00219983241270999
Seyed Ali Hosseini Kordkheili, HR Jafari
This work aims to study thermal stability and ablative behaviors of Carbon/Phenolic composites containing nano clay, nano graphene oxide and hybrid additives. To this end a detailed explained and illustrated process is involved to synthesize factionalized graphene oxide based on Hummers method. The XRD test result shows a major shift in basal plane reflection to below 2θ = 20° in the provided spectrum, which indicates achievement in the functionalization process. Prepared nanoparticles suspensions are then mixed by resol resin with desire wt% to outcome nanocomposites. An in-depth analysis of SEM images with focus on the dispersion, morphology, and interaction of the nanofillers with the resin matrix reveals that nanoparticles are dispersed properly with no agglomeration. 200 gr/m2 carbon woven fabric is then impregnated with prepared nanocomposites employing an own made prepreg machine to use to construct standard flexural as well as oxy acetylene test specimens. Using bending test, thermogravimetric analysis and oxyacetylene torch test, effects of different percentages of considered nanoparticles on the mechanical properties, thermal stability and ablative of carbon/phenolic composites are assessed and the results are reported. According to the results, adding only 0.1 wt% of nano graphene oxide increases char yield around 5% and remain back surface temperature under 100°C during flame test. Moreover samples with 0.2 wt% of nano clay and hybrid (0.05 wt% nano graphene oxide and 0.1 wt% nano clay) additives provides best reaming amount of solid.
这项工作旨在研究含有纳米粘土、纳米氧化石墨烯和混合添加剂的碳/酚复合材料的热稳定性和烧蚀行为。为此,对基于 Hummers 方法合成派生氧化石墨烯的过程进行了详细解释和说明。XRD 测试结果表明,在所提供的光谱中,基底面反射主要转移到 2θ = 20° 以下,这表明功能化过程已经完成。然后将制备好的纳米颗粒悬浮液与浓度为 0.5%的可溶性树脂混合,得到纳米复合材料。通过深入分析扫描电镜图像,重点观察纳米填料的分散、形态以及与树脂基体的相互作用,发现纳米粒子分散良好,没有团聚现象。然后用自制的预浸料机将 200 克/平方米的碳纤维织物浸渍在制备好的纳米复合材料中,用于制作标准的弯曲和氧乙炔试样。通过弯曲试验、热重分析和氧乙炔炬试验,评估了不同比例的纳米颗粒对碳/酚醛复合材料的机械性能、热稳定性和烧蚀性的影响,并报告了结果。结果表明,仅添加 0.1 wt% 的纳米氧化石墨烯就能提高约 5%的炭产量,并在火焰测试中将背面温度保持在 100°C 以下。此外,添加了 0.2 wt% 纳米粘土和混合添加剂(0.05 wt% 纳米氧化石墨烯和 0.1 wt% 纳米粘土)的样品可提供最佳的固体铰孔量。
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引用次数: 0
Evaluation of drilling by induced delamination of hybrid biocomposites reinforced with natural fibers: A statistical analysis by RSM 天然纤维增强混合生物复合材料的钻孔诱导分层评估:RSM 统计分析
IF 2.9 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-08-07 DOI: 10.1177/00219983241271035
Abdelmalek Elhadi, Salah Amroune, Mohamed Slamani, Mohammad Jawaid, Ugur Koklu, Tarek Bidi
Studying the drilling of a hybrid jute/palm composite material offers significant contributions to sustainable material development. Incorporating renewable jute and palm fibers represents an innovative, eco-friendly approach compared to synthetic composites. This research aims to optimize drilling parameters to reduce defects and evaluate the performance of different drilling tools, crucial for industrial applications. Drilling is performed via three different types of drills bit: High-Speed Steel, HSS-Co5 coated high-speed steel with 5% cobalt, and carbide. The drilling process involves adjusting the feed and rotational speed. Response Surface Methodology (RSM) was used to select drilling settings by validating experimentally obtained data and predicting the behavior of the structure based on cutting circumstances. The findings indicated that the most effective cutting parameters for minimizing delamination are achieved using the HSS drill bit, namely at lower feed and rotational speeds. Delamination remains below the threshold of 1.106 when the feed is 0.04 mm/rev and the rotational speed is 1592 rpm. The analysis of the results obtained using the response surface methodology indicates that the R2 coefficient for cylindricity is 0.96%. In contrast, the rate of delamination is 0.79% and the rate of circularity is 0.89%.
对黄麻/棕榈混合复合材料的钻孔研究为可持续材料开发做出了重大贡献。与合成复合材料相比,加入可再生黄麻和棕榈纤维是一种创新的生态友好型方法。这项研究旨在优化钻孔参数以减少缺陷,并评估不同钻孔工具的性能,这对工业应用至关重要。钻孔是通过三种不同类型的钻头进行的:高速钢、HSS-Co5(含 5%钴)涂层高速钢和硬质合金。钻孔过程包括调整进给量和转速。通过验证实验数据并根据切削情况预测结构行为,采用响应面方法(RSM)选择钻孔设置。研究结果表明,使用高速钢钻头,即以较低的进给量和转速进行钻孔时,可获得最有效的切削参数,从而最大限度地减少分层。当进给量为 0.04 mm/rev,转速为 1592 rpm 时,分层仍低于 1.106 的临界值。采用响应面方法对结果进行分析后发现,圆柱度的 R2 系数为 0.96%。相比之下,分层率为 0.79%,圆度为 0.89%。
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引用次数: 0
Compaction behaviour of flax-preforms during forming for composites 亚麻预成型材料在复合材料成型过程中的压实性能
IF 2.9 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-08-05 DOI: 10.1177/00219983241266928
Rishad Rayyaan, Zeshan Yousaf, Mahmudul Akonda, Prasad Potluri, William Richard Kennon
Flax reinforced composites are becoming popular in automotive and civil industries due to their green production and recycling, and for good specific strength. To manufacture composites, firstly a multi-layer of flax preforms undergo compressive pressure before resin impregnation that causes nesting, wherein, fibres of one layer fit into the adjacent layers. This debulking of the preforms under compression is an important feature that determines the fibre volume fraction of composites. In this study, four flax structures such as: nonwoven tapes, unidirectional fabric, hopsack fabric, and nonwoven tape with glass veils were investigated for compaction behaviour under pressures between 1 and 10 bars, in single and multi-layer states, in dry and wet states, under different loading cycles, and in different ply orientations (0°/0° and 0°/90°). Nesting has been calculated for single- and multi-layer stacks. It was observed that the nonwoven structures shown greater thickness reduction compared to woven structures. Nesting factor was found to be higher than 1 for the nonwoven structures under compaction, indicating lower nesting, compared to the woven structures. In terms of thickness under repeated compaction, the reduction was the highest during first compressions, compared to the 2nd and 3rd compressions, for all the structures. When wettability was examined, thickness reduction for wet plies was higher for all the structures, compared to the dry phase. Finally, a comparative study was shown to evaluate fibre volume fractions of the composites.
亚麻增强复合材料因其绿色生产、可回收利用以及良好的比强度而在汽车和民用工业中越来越受欢迎。制造复合材料时,首先要对多层亚麻预型件施加压缩压力,然后进行树脂浸渍,从而造成嵌套,即一层纤维与相邻层纤维嵌合。预制构件在压缩过程中的这种分层是决定复合材料纤维体积分数的一个重要特征。在这项研究中,研究了四种亚麻结构,如:无纺布带、单向织物、啤酒花织物和带玻璃纤维纱的无纺布带,在 1 到 10 巴的压力下,在单层和多层状态下,在干燥和潮湿状态下,在不同的加载周期下,以及在不同层取向(0°/0° 和 0°/90°)下的压实行为。对单层和多层堆叠的嵌套进行了计算。结果表明,与编织结构相比,无纺结构的厚度减薄幅度更大。与编织结构相比,压实下无纺布结构的嵌套系数大于 1,表明嵌套程度较低。就反复压实下的厚度而言,在所有结构中,第一次压实时的厚度减幅最大,而第二次和第三次压实时的减幅最小。在对湿润性进行研究时,与干燥阶段相比,所有结构的湿层厚度减少幅度都更大。最后,对复合材料的纤维体积分数进行了比较研究。
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引用次数: 0
Insights into morphology and mechanical properties of architected interpenetrating aluminum-alumina composites 深入了解构架互穿氧化铝复合材料的形态和机械性能
IF 2.9 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-08-05 DOI: 10.1177/00219983241271054
Carlos Matos, Simão Santos, Isabel Duarte, Susana M Olhero, Georgina Miranda
Additive manufacturing (AM) technologies are unleashing the restrictions imposed by conventional manufacturing, allowing the production of innovative designs tailored to improve properties or performance. AM techniques in ceramic production allow the application of novel designs to ceramic parts, opening new opportunities for combining technologies aiming to obtain architected interpenetrating phase composites (IPCs). In this study, alumina structures with different architectures and Computer Aided Design (CAD) structure porosity oriented unidirectionally or bidirectionally, were fabricated by vat photopolymerization technique, namely Digital Light Processing. Afterwards, these structures were infiltrated with an aluminum alloy through investment casting, thus obtaining aluminum-alumina IPCs. Under compression, the IPCs presented a ductile behavior, conversely to the fragile ceramic counterparts. The IPCs compressive strength and absorbed energy were expressively higher than their ceramic counterparts. Comparing the bidirectional IPCs with the unidirectional ones, a significant increase in compressive strength and absorbed energy was observed, from 36.2% to 42.3% and from 164.8% to 358.1%, respectively, due to the greater amount and interconnection of the metal inside the ceramic structure. This study demonstrates the feasibility of this manufacturing route, combining two distinctive technologies, for the fabrication of metal-ceramic architected IPCs, allowing to tailor their mechanical properties and energy absorption capacity for a given application.
快速成型制造(AM)技术正在打破传统制造工艺的限制,允许生产为改善特性或性能而量身定制的创新设计。陶瓷生产中的快速成型技术允许将新颖的设计应用于陶瓷部件,为旨在获得结构互穿相复合材料(IPC)的技术组合带来了新的机遇。在这项研究中,采用大桶光聚合技术,即数字光处理技术,制造了具有不同结构和计算机辅助设计(CAD)结构孔隙率的单向或双向定向氧化铝结构。然后,通过熔模铸造将铝合金渗入这些结构,从而获得铝氧化铝 IPC。在压缩条件下,IPC 具有韧性,这与易碎的陶瓷材料截然不同。IPC 的抗压强度和吸收能量都明显高于陶瓷。双向 IPC 与单向 IPC 相比,抗压强度和吸收能量都有显著提高,分别从 36.2% 提高到 42.3%,从 164.8% 提高到 358.1%,这是因为陶瓷结构内部的金属量更大,相互连接更紧密。这项研究证明了这一制造工艺的可行性,它结合了两种独特的技术,可用于制造金属陶瓷结构的 IPC,从而针对特定应用定制其机械性能和能量吸收能力。
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引用次数: 0
An efficient pre-analysis and optimization generation method for reference curves of automated fiber placement path planning 自动光纤铺设路径规划参考曲线的高效预分析和优化生成方法
IF 2.9 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-08-04 DOI: 10.1177/00219983241270958
Fuhong Yang, Hong Xiao, Yugang Duan, Feng Wang, Jiahua Lou, Feng Yang, Shanshan Tang, Haojun Wang
Complex curved composite components often rely on multiple reference curve algorithms for path planning in automated fiber placement. However, the reference curves are typically manually drawn. Moreover, designing the reference curves follows an iterative planning-analysis-improvement process, which can be inefficient. A new approach for the automatic pre-analysis and optimized generation of reference curves for fiber placement is proposed in this paper to enhance the efficiency of reference curve analysis and generation. Firstly, a pre-analysis algorithm for reference curves based on triangular meshes is proposed. This algorithm analyzes the theoretical geodesic curvature and angular deviation of the path before its planning. Subsequently, a comprehensive evaluation index for reference curve generation is formulated based on the pre-analysis algorithm, and the reference curve is optimized using genetic algorithms. The results demonstrate that the pre-analysis algorithm accurately computes the steering radius distribution of the path. Areas with over-limit steering radius can be eliminated while maintaining angular deviations within 10° by utilizing optimized reference curves for path planning.
复杂的曲面复合材料组件在自动纤维铺放过程中通常需要依靠多参考曲线算法进行路径规划。然而,这些参考曲线通常都是人工绘制的。此外,参考曲线的设计需要遵循 "规划-分析-改进 "的迭代过程,效率可能很低。为了提高参考曲线分析和生成的效率,本文提出了一种自动预分析和优化生成光纤铺放参考曲线的新方法。首先,本文提出了一种基于三角形网格的参考曲线预分析算法。该算法在路径规划前分析路径的理论大地曲率和角度偏差。随后,基于预分析算法制定了参考曲线生成的综合评价指标,并利用遗传算法对参考曲线进行了优化。结果表明,预分析算法能准确计算路径的转向半径分布。利用优化的参考曲线进行路径规划,可以消除转向半径超限的区域,同时将角度偏差保持在 10° 以内。
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引用次数: 0
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