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Influence of Filler Precoating and printing parameter on Mechanical Properties of 3D Printed Acrylonitrile Butadiene Styrene/Zinc Oxide Composite

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POLYMER-PLASTICS TECHNOLOGY AND MATERIALS 2019年第1期58卷 1-13页

作者： Aw, Yah Yun Yeoh, Cheow Keat Idris, Muhammad Asri Teh, Pei Leng Elyne, Wan Nurshaznie Hamzah, Khairul Amali Sazali, Shulizawati Aqzna Malaysia Perlis Unimap Jejawi Sch Mat Engn Univ Perlis Malaysia

Acrylonitrile butadiene styrene (ABS)/zinc oxide(ZnO) composites have been fabricated via fused deposition modelling technique. The effect of filler precoating and printing parameters on mechanical properties of the composites are investigated. The incorporation of precoated fillers and increase of infill density improve the tensile strength, Young's modulus and hardness of the composites. printing pattern determines mainly the tensile properties of the composites but has no significant effect on the hardness. Based on experimental results, it is suggested that line pattern printed with precoated fillers at medium dispenser speed and 100% infill density has resulted improved mechanical properties. [GRAPHICS] .

关键词： ABS filler precoating fused deposition modelling hardness printing parameter tensile properties ZnO

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Investigate mechanisms of different printing parameters on the mechanical anisotropy of 3D concrete printing elements by using computed tomography scan and computational fluid dynamics methods

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ADDITIVE MANUFACTURING 2025年 103卷

作者： Liu, Zhenbang Li, Mingyang Wang, Xiangyu Wong, Teck Neng Tan, Ming Jen Nanyang Technol Univ Singapore Ctr 3D Printing 50 Nanyang Ave Singapore 639798 Singapore Nanyang Technol Univ Sch Mech & Aerosp Engn 50 Nanyang Ave Singapore 639798 Singapore

3D concrete printing (3DCP) elements show significant mechanical anisotropy. printing parameters can affect the mechanical anisotropy of 3DCP elements. However, most studies have focused on the effects of printing parameters on the interlayer bond strength at a macroscale level. The mechanisms of printing parameters on the mechanical anisotropy of 3DCP elements remain unclear. To fill research gaps, computed tomography (CT) scans, computational fluid dynamics (CFD) numerical simulations, and uniaxial compression tests (UCTs) were conducted with the printing parameters of the expansion state of the nozzle flow channel, overflow ratio, standoff distance, and flow rate involved. The results of CT scans, CFD simulations, and UCTs revealed the mechanism that the printing parameters affect porosity distribution and pore anisotropy by influencing the normalized local pressure at interlayer and fluid velocity gradients, respectively, which further results in the modification of the mechanical anisotropy of 3DCP elements.

关键词： 3D concrete printing Anisotropic performance Computed tomography scan Computational fluid dynamics simulation printing parameter

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Optimizing FDM 3D printing parameters for improved tensile strength using the Takagi-Sugeno fuzzy neural network

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MATERIALS TODAY COMMUNICATIONS 2024年 38卷

作者： Wei, Hanjun Tang, Lu Qin, Haolin Wang, Haodong Chen, Caihua Li, Ying Wang, Cunxian Chengdu Univ Inst Adv Study Chengdu 610106 Peoples R China Northwestern Polytech Univ Inst Extreme Mech Sch Aeronaut Xian 710072 Peoples R China Chengdu Univ Technol Sch Comp Sci & Cyber Secur Chengdu 610051 Peoples R China Chengdu Univ Sch Mech Engn Chengdu 610106 Peoples R China

3D printing is a popular technology for fabricating three-dimensional objects, and it is crucial to select appropriate printing parameters to enhance production quality, reduce costs, and purposefully control the performance of printed products. This study aimed to establish a predictive model for the tensile strength of different FDM 3D printing parameter combinations with polylactic acid (PLA) materials using a Takagi-Sugeno (T-S) fuzzy neural network model. The deposition layer thickness (d), printing temperature (T), printing speed (V), and filling density (rho) were selected as influential factors on the tensile strength. Based on the prediction results of the T-S fuzzy neural network model, three sets (the 4th, 32nd, and 58th) of predicted parameters were chosen for experimental validation. The results showed that the deposition layer thickness affects the morphology of the PLA fibers, and increasing the filling density reduces the air gaps, ultimately impacting the tensile strength of the test specimen. Furthermore, the relative error between the predicted and experimental test values of the tensile strength ranged from 5 % to 10 %. Therefore, the T-S fuzzy neural network model holds great potential for predicting the tensile strength of FDM 3D printed tests.

关键词： FDM 3D printing printing parameter T -S fuzzy neural network Tensile strength

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Research on printing parameters and salt frost resistance of 3D printing concrete with ferrochrome slag and aeolian sand

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JOURNAL OF BUILDING ENGINEERING 2024年 84卷

作者： Dong, Wei Wang, Junfeng Hang, Meiyan Qu, Shuqiang Inner Mongolia Univ Sci & Technol Coll Civil Engn Baotou 014010 Peoples R China Inner Mongolia Autonomous Reg Key Lab Civil Engn S Baotou 014010 Peoples R China Baotou City Anshun New Bldg Mat LLC Co Baotou 014010 Peoples R China

Aeolian sand (AS) and ferrochrome slag (FS), an industrial byproduct, are abundant in Inner Mongolia. Rational use of FS and AS resources can lead to better economic benefits. In this study, FS and AS were used as fine aggregates to prepare 3D printed concrete (3DPFAC). The effect of different printing parameters on the mechanical properties of 3DPFAC was investigated and the optimal printing parameters were determined. The durability of 3DPFAC in salt freeze -thaw cycle (FTC) environments was analyzed by FTC tests. The mass loss rate, relative dynamic elastic modulus, and compressive strength loss rate are used to characterize the performance degradation law of 3DPFAC and the mechanism of performance degradation is revealed by SEM, XRD, and bubble spacing analyzer. We conclude that the optimal printing parameters for 3DPFAC are 20 mm print nozzle diameter, 8 mm print layer height, 50 mm/s print travel speed, and consecutive print interval time. Under different production processes, the degree of damage and deterioration of concrete is 3D -Y (loading along the Y direction) > 3D -X (loading along the X direction) > JZ (pouring specimens). After 400 FTCs, the mass loss rates for JZ, 3D -X and 3D -Y were 3.02 %, 3.12 % and 3.56 %, respectively, the relative dynamic elastic modulus decreased to 71.78 %, 66.18 % and 58.64 %, respectively, with compressive strength loss rates of 21.0 %, 22.4 % and 24.0 %. Finally, the damage evolution equation for 3DPFAC is derived using the Weibull distribution model, and the lifetime prediction is performed based on the Weibull distribution damage model. The results can provide a theoretical basis for the application of FS and AS in the 3DPC domain.

关键词： 3D printing concrete Ferrochrome slag Aeolian sand printing parameter Freeze -thaw cycle

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Influence of printing parameters on 3D printing engineered cementitious composites (3DP-ECC)

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CEMENT & CONCRETE COMPOSITES 2022年 130卷

作者： Zhou, Wen Zhang, Yamei Ma, Lei Li, Victor C. Univ Michigan Dept Civil & Environm Engn Ann Arbor MI 48109 USA Southeast Univ Sch Mat Sci & Engn Nanjing 211189 Peoples R China

3D printing of engineered cementitious composites (3DP-ECC) serves as an effective means to enable digital and automated construction while removing the dependence of steel reinforcement typical in normal concrete construction. As generally recognized, process control in 3DP is as crucial as material constituents to the per-formance of the printed structure. printing parameters pose direct influence on the micro-structure of material, which further impacts the macro-scale properties of printed ECC. In this paper, the effects of different nozzle standoff distances and nozzle travelling speeds are investigated. It is found that lowering the nozzle standoff distance within a certain range increases the in-plane tensile strength and strain capacity of 3DP-ECC by 39% and 30%, respectively. The tensile performance is also enhanced by a moderate printing speed. In addition, a 141% increase in interfacial fiber bridging force is found with elevated nozzle standoff distance. Furthermore, the micro-structure observed via mu-CT correlates well with the printing parameters, micro-structure and macro-scale properties of 3DP-ECC.

关键词： Engineered cementitious composites (ECC) 3D printing Mechanical properties Micro-structure printing parameter

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Polymer-metal powders melt extrusion printing to produce high-density, high-conductivity pure copper components

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JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 2025年 35卷 1323-1334页

作者： Guo, Xiuhu Liu, Junnan Li, Lu Cui, Xiaoying Hayat, Muhammad Dilawer Cao, Peng Yuan, Zhentao Wang, Xiao Chen, Xiulin Kunming Univ Sci & Technol Fac Mat Sci & Engn Kunming 650093 Peoples R China Kunming Univ Sci & Technol Res Ctr Anal & Measurement Kunming 650093 Peoples R China Univ Waikato Fac Engn Hamilton New Zealand Kunming Univ Sci & Technol City Coll Kunming 650051 Peoples R China Soloman Alloy New Mat Co Ltd Changzhou 215000 Peoples R China

In this study, we utilized material extrusion (MEX) molding additive manufacturing and debinding sintering technology to create pure copper parts with high density and exceptional conductivity. This was achieved using self-developed MEX raw materials with pure copper powder accounting for 60 vol %. The macroscopic and microscopic characteristics of green, debound and sintered parts were comprehensively characterized. The relationship between density and different sizes of nozzles and different layer heights was examined. After immersing the green body in an n-hexane solution at 40 degrees C for 12 h, a debinding rate of 95 % was achieved. The debounded parts were then sintered at 1050 degrees C in argon-hydrogen (H similar to 10 vol %) mixed gas. The results show that the copper parts produced with a 0.6 mm nozzle and 0.1 mm layer height exhibited the best performance, achieving a density greater than 98 %, conductivity of similar to 93 % IACS, ultimate tensile strength of 198 MPa, and elongation at break of 34 %. This study offers a novel MEX printing approach for the additive manufacturing of pure copper, focusing on raw material formulation and optimizing experimental parameters.

关键词： Material extrusion Copper printing parameter Conductivity Density

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Additive manufacturing of novel lightweight insulation refractory with hierarchical pore structures by direct ink writing

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CERAMICS INTERNATIONAL 2024年第7期50卷 11469-11476页

作者： Li, Saisai Xin, Jiaxuan Chen, Ruoyu Wen, Haiming Anhui Univ Technol Adv Ceram Res Ctr Sch Mat Sci & Engn Maanshan Peoples R China Anhui Univ Technol Sch Met Engn Maanshan 243002 Anhui Peoples R China Missouri Univ Sci & Technol Dept Mat Sci & Engn Rolla MO 65409 USA

A direct ink writing process using fly ash foaming slurries was employed for the additive manufacturing of lightweight mullite insulation refractory with hierarchical pore structures. The viscosity, thixotropy, and shear thinning behavior of the inks were analyzed to investigate the effect of the inorganic binder and dispersant of the foaming inks. A slurry exhibiting excellent rheological characteristics was identified, consisting of 45 wt% fly ash floating beads, 55 wt% water, 3.0 wt% additional dispersant, and 6.0 wt% additional binder. Furthermore, through the optimization of printing parameters such as printing pressure and printing speed, notable enhancements were achieved in the pore structure and properties of the final insulation refractory. Upon heating the lightweight insulation refractory to 1300 C, the bulk density, compressive strength, and thermal conductivity were determined to be 0.61 g/cm3, 1.01 MPa, and 0.13 W/(m & sdot;K), respectively. The direct ink writing technique demonstrates substantial potential in manufacturing lightweight refractories that possess superior thermal insulation and reliable usage strength.

关键词： Additive manufacturing Hierarchical pore structures Lightweight insulation refractory Rheology printing parameter

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Mechanics-guided manufacturing optimization framework to enhance the strength of architected lattice made from recycled plastic wastes

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ADDITIVE MANUFACTURING 2024年 81卷

作者： Ma, Wenqian Dong, Qing Zhao, Haiyang Li, Xuanyou Xiong, Lu Hu, Nan South China Univ Technol Sch Civil Engn & Transportat Guangzhou 510641 Peoples R China South China Univ Technol Sch Architecture Guangzhou 510641 Peoples R China State Key Lab Subtrop Bldg & Urban Sci Guangzhou 510641 Peoples R China Pazhou Lab Guangzhou 510335 Peoples R China

Improving the built quality of printed objects is commonly tackled from a material composition or manufacturing processing perspective, but mechanics also play a critical role in controlling performance of the printed parts. In this study, we investigate lattices that are manufactured with recycled PLA (Polylactic Acid) using a mechanicsguided approach, which assigned optimal printing parameters to specific struts according to a possible tensile, compressive, and flexural stress state. We identify the optimal combinations of nozzle temperature, printing speed, and layer heights using standard test specimens for each loading scenario, The strengths of specimens with optimal parameters are up to 23% higher than those with default parameters. Guided by simulations and experiments, we then compared the compressive strength and energy absorption of recycled PLA lattices fabricated by programmable printing parameter sets against those with default parameter sets without considering mechanical features. Strength and energy-absorbing ability can be improved by up to 25.52% and 140.22% respectively. Overall, we validate the role of mechanics in fabricating a 3D-printed object and envision that our approach is universal and applicable to improving the mechanical properties of any given geometries printed by other methods and with other base materials.

关键词： printing parameter Optimization Fused deposition modeling Lattice Recycled polylactic acid

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Exact forming for additive manufacturing using an irregular element-based compensating approach: Simulation, experiment, and detection

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MECHANICS OF ADVANCED MATERIALS AND STRUCTURES 2024年第26期31卷 7567-7578页

作者： Bai, Ruqing Pu, Huayan Liang, Guan Naceur, Hakim Coutellier, Daniel Du, Yangkun Zhao, Jinglei Yi, Jin Li, Xueping Yuan, Shujin Luo, Jun Lin, Jun Chongqing Univ State Key Lab Mech Transmiss Chongqing Peoples R China Valenciennes INSA Hauts de France CNRS UMR 8201 LAMIH Valenciennes France Univ Glasgow Sch Math & Stat Glasgow Lanark Scotland Shandong Univ Sch Mat Sci & Engn Jinan Shandong Peoples R China

During the additive manufacturing, the shape of workpieces is influenced by printing parameters. To achieve the desired shape of the workpiece, an optimization algorithm is often used to determine an effective combination of printing parameters. Although multiparameter optimization can improve structure quality, they are very time-consuming. In this article, we propose a timesaving irregular element-based compensating approach, which allows a more precise fitting of the geometric boundaries without needing additional computing resources. Finally, we demonstrate that the proposed approach can accurately shape the workpiece to fulfill the expected computer-aided design geometry by experimental verification and error comparison analysis.

关键词： AM Ti-6Al-4V slender cylinder printing parameter compensating approach irregular discretization

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Experimental study on buildability and mechanical properties of 3D printing cob

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CONSTRUCTION AND BUILDING MATERIALS 2024年 453卷

作者： Wu, Xikai Shi, Qingxuan Huo, Jian Zhao, Yu Zhu, Lingli Tao, Yi Xian Univ Architecture & Technol Sch Civil Engn Xian 710055 Peoples R China Henan Polytech Univ Sch Civil Engn Jiaozuo 454000 Peoples R China Henan Polytech Univ Sch Mat Sci & Engn Jiaozuo 454000 Peoples R China Xian Univ Architecture & Technol State Key Lab Green Bldg Xian 710055 Peoples R China

The application of 3D printing technology to earth buildings conforms to the development concept of low carbon, green and intelligent construction. The key issue lies in the development of earth material with both favorable buildability and sufficient mechanical properties. In this study, the printing parameters of mixture for 3D printing with different water contents were optimized. The optimum water content of 3D printing cob was determined based on the buildability. The result shows that when the flow spreading diameter is between 140 mm and 160 mm, 3D printing cob has good buildability performance. The optimum water content is 24.6 %. In addition, anisotropic performance was analyzed by compressive strength tests from three orthogonal directions. In particular, according to the test results of single printing limit height and yield stress, the buildability of 3D printing cob wall was analyzed. The building strategy of the printing divided into multiple times was obtained.

关键词： 3D printing cob printing parameter Buildability Mechanical anisotropy

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