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Forming Ability and Stress Distribution of Integral Stiffened Structure by Laser Peening Based on process strategy

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE 2025年 1-20页

作者： Jiang, Gaoqiang Zhou, Jianzhong Li, Qingjia Li, Chengwei Meng, Xiankai Huang, Shu Hu, Yongxiang Jiangsu Univ Sch Mech Engn Zhenjiang 212013 Peoples R China Shanghai Jiao Tong Univ Sch Mech Engn Shanghai 200240 Peoples R China Zhejiang Prov Innovat Ctr Laser Intelligent Equipm Wenzhou 325038 Peoples R China

A combination of simulation and experiment was employed to investigate the coordinated forming process, focusing on the forming ability and symmetry, of the integral stiffened structure (ISS) in both the UD and CD by laser peening (LP). The dynamic response process and forming ability of the ISS were systematically explored under various forming and scanning strategies. A comprehensive comparison and analysis of the stress evolution process and distribution state were conducted, identifying and harmonizing the optimal process strategy in the both directions. The coordinated forming process strategy for the ISS was validated through experimental means. The results reveal that "plate driving stiffener" forming strategy offers larger forming ability in the UD, whereas "stiffener driving plate" strategy exhibits increased forming ability in the CD. The deformation value achieved through "sequential forming" in the UD is maximum, while "symmetric interleaving forming" proves to be the most effective forming strategy in the CD. The forming strategy of "plate driving stiffener" demonstrates significant beneficial compressive stresses on both sides. The "sequential forming" scanning strategy results in a more uniform distribution of compressive stress, thereby enhancing material durability more effectively. By integrating the optimal process strategy, the curvature radius is 566.3 and 162.5 mm in the two directions, demonstrating a significant enhancement in forming ability.

关键词： forming ability integral stiffened structure laser peen forming process strategy stress distribution

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An Active Learning Exercise for Teaching process strategy Alignment and process Improvement

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TRANSPORTATION JOURNAL 2023年第4期62卷 458-477页

作者： Liu, Huiling Mackelprang, Alan W. Alabama State Univ Montgomery AL 36101 USA Georgia Southern Univ Statesboro GA 30458 USA

This hands-on active learning exercise uses an origami activity to teach students how to (1) achieve competitive priorities through process design and (2) monitor and evaluate process performance for potential improvement. Students are expected to explore current work processes for areas of improvement by focusing on process structure and resource management in process design and evaluation. Through the activity, students are exposed to linking process design with competitive priorities and challenged to evaluate their process for potential improvement. We provide several extensions of the activity that can be utilized to further its pedagogical utility.

关键词： active learning process strategy process improvement competitive priority supply chain management

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Component analysis and utilization strategy of brown macroalgae as promising feedstock for sugar platform-based marine biorefinery

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BIOTECHNOLOGY AND BIOprocess ENGINEERING 2024年第1期29卷 1-24页

作者： Lee, Jeongho Shin, Hyeonmi Lee, Kang Hyun Lee, Hyeseon Lee, Giwon Jang, Sungho Jung, Gyoo Yeol Yoo, Hah Young Park, Chulhwan Sangmyung Univ Dept Biotechnol Seoul 03016 South Korea Kwangwoon Univ Dept Chem Engn Seoul 01897 South Korea Dongyang Mirae Univ Dept Bioconvergence Engn Seoul 08221 South Korea Incheon Natl Univ Dept Bioengn & Nanobioengn Incheon 22012 South Korea Pohang Univ Sci & Technol Dept Chem Engn Pohang 37673 South Korea

Brown algae have gained attention as a sustainable feedstock for biorefineries due to their ability to sequester carbon dioxide, rapid growth, and high carbohydrate content. The carbohydrate content in brown algae has only been analyzed for a few species, and in most cases, access to fundamental data such as sugar composition is limited, which hinders the assessment of brown algal biomass-based biorefining potential. In this study, the carbohydrate composition of brown algae (Undaria pinnatifida, Saccharina japonica, Ecklonia cava, and Ecklonia stolonifera) was analyzed in detail and application directions were proposed. As a result, alginate and glucan were detected in all resources, and the contents (alginate and glucan wt%) were as follows: U. pinnatifida (39.6 and 4.9 wt%), S. japonica (34.0 and 6.3 wt%), E. cava (24.3 and 7.7 wt%), and E. stolonifera (39.1 and 9.7 wt%). All feedstocks contain trace amounts (2.9-4.9 wt%) or no xylan-mannan-galactan. Mannitol was detected only in S. japonica (26.7 wt%) in rich, showing high potential as a biorefinery feedstock. We highlight that the carbohydrate composition of E. cava and E. stolonifera was analyzed for the first time and the potential use of brown algal biomass in a biorefinery approach.

关键词： Brown algae Carbohydrate Alginate Biorefinery process strategy Ecklonia

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Graph-based spot melting sequence for electron beam powder bed fusion

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ADDITIVE MANUFACTURING 2024年 91卷

作者： Kupfer, Tobias Breuning, Christoph Markl, Matthias Friedrich Alexander Univ Erlangen Nurnberg Chair Mat Sci & Engn Met Martensstr 5 D-91058 Erlangen Germany

Powder bed fusion processes are currently used to manufacture parts with high geometric complexity. However, achieving defect-free complex geometries with homogeneous properties using classic line-based melting strategies remains challenging. Electron beam powder bed fusion offers a promising solution through spot melting, which involves jumping from one melt spot to another at a very high velocity. The key concept is that homogeneous properties can be attained if all melt spots are thermally independent of each other. The corresponding sequence of these melt spots controls the temperature field, thereby influencing the microstructure and mechanical properties. The main challenge is to develop a spot-melting sequence that ensures thermal independence of the spots while adhering to other process constraints, such as machine- dependent jump lengths. In this study, we developed a new heuristic algorithm to generate a spot-melting sequence. This method is based on the subdivision of complex geometries into consecutive melted groups. The groups were transformed into graphs connecting the spots inside the groups with all possible jumps that met certain machine restrictions. A heuristic algorithm, adapted to identify the Hamiltonian paths, determines the final spot-melting sequence. We demonstrated the applicability of the heuristic algorithm to complex geometries using single layer of a fuel nozzle combined with temperature simulations.

关键词： Electron beam powder bed fusion Spot melting process strategy Numerical simulation Finite difference

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Investigating the Effect of Packed Structures on Filter Cake Compressibility

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CHEMICAL ENGINEERING & TECHNOLOGY 2021年第4期44卷 661-669页

作者： Bandelt Riess, Peter Michael Kuhn, Michael Foerst, Petra Briesen, Heiko Tech Univ Munich TUM Sch Life Sci Weihenstephan Chair Proc Syst Engn Gregor Mendel Str 4 D-85354 Freising Weihenstephan Germany

Packed beds used in absorption columns have shown to increase filter cake permeability during specific filtration processes. Their effect on filter cake compressibility is evaluated. Different model systems are characterized using dead-end filtration equipment and a modified universal testing machine. Compression experiments are conducted with different packings to assess the systems' response to compressive stress. The structural support of the packings reduces filter cake compressibility for the tested configurations. The extent of this effect depends on packing type, applied pressure, and material compressibility. These results help to understand the advantages of using packed beds as aids for filtration processes and represent a step further in designing tailored packings.

关键词： Cake filtration Compressibility Packed beds process strategy

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Assessing the Effects of Packed Beds on Lautering Performance and Wort Quality

BREWING SCIENCE

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BREWING SCIENCE 2021年第5-6期74卷 82-87页

作者： Riess, P. M. Bandelt Streit, J. A. Bertazzoni Kuhn, M. Briesen, H. Foerst, P. Tech Univ Munich Chair Proc Syst Engn TUM Sch Life Sci Weihenstephan Freising Weihenstephan Germany

The production in a brewery can be considerably affected by the lautering performance. To counteract inefficiencies and accelerate this operation, a novel process strategy is applied and evaluated. The incorporation of additional wall support by using different configurations of packed beds is studied in a laboratory setup. As a result, the compressibility of the filter cake is greatly reduced, and the wort flow through it is improved. Significant lautering time savings of 75% are achieved through a specific type of packing without sacrificing wort quality. These findings might help brewers to modernize the lauter tun and increase production capacity.

关键词： Lautering Mash Separation Packed Beds Cake Filtration process strategy

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Effect of heat accumulation on the single track formation during laser metal deposition and development of a framework for analyzing new process strategies

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JOURNAL OF LASER APPLICATIONS 2021年第1期33卷

作者： Heilemann, Markus Prakash, Vishnuu Jothi Beulting, Lorenz Emmelmann, Claus Fraunhofer Res Inst Addit Mfg Technol IAPT Schleusengraben 14 D-21029 Hamburg Germany Hamburg Univ Technol Inst Laser & Syst Technol Denickestr 17 D-21073 Hamburg Germany

Laser metal deposition (LMD) is getting more attention as a 3D printing technique recently. Compared to the cladding application, the process of building 3D structures is more challenging to control when it comes to complex structures. Changing heat transfer mechanisms over the building height and at critical part geometries can lead to instabilities during the process. This paper studies the effect of the surface temperature on single track geometry formation during the LMD process. The geometrical characteristic of the track formation is a key factor that needs to be controlled and monitored in any deposition process for a stable build job. To quantify the effect of the surface temperature on the track geometry, a stepwise preheated substrate from 25 to 500 degrees C is used, and the track height, width, and degree of dilution are evaluated. This experiment mimics the varying temperature of the prebuilt layers that occur during additive manufacturing of freeform structures with many layers. Understanding the influence of the surface temperature over the layer geometry gives an idea of build geometry variation due to the accumulated heat input along the build direction. This helps in defining process strategies and process parameters for the laser metal deposition of components with increased accuracy and reproducibility. Advanced process strategies that are essential for a successful build job need to be incorporated into a data preparation tool for robot code generation. Commercial software packages are available for regular additive path planning using industrial robots. However, when several process strategies and process parameters need to be adapted and varied along the build direction, one is pushed to the limits of the software capabilities. Therefore, an automated data preprocessing toolbox based on MATLAB has been developed for the implementation of process strategies through user-definable rules and algorithms. This eliminates manual robot code preparati

关键词： laser metal deposition process strategy track geometry multidirectional slicing additive manufacturing

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Research progress on modification of phenolic resin

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MATERIALS TODAY COMMUNICATIONS 2021年 26卷

作者： Tang, Kaihong Zhang, Ailing Ge, Tiejun Liu, Xiaofeng Tang, Xiaojun Li, Yongjiang Shenyang Univ Technol Sch Environm & Chem Engn Shenyang 110870 Peoples R China Shenyang Univ Chem Technol Plast Engn Res Ctr Shenyang 110142 Peoples R China Liaoning Polymer Mat Engn & Technol Res Ctr Shenyang 110142 Peoples R China Yingkou Sounrun New Mat Engn Technol Co Ltd Yingkou 115000 Peoples R China

With the widening of the application fields of phenolic resins, many types of modifiers have been used to modify the molecular structure of phenolic resins. In recent years, more and more researchers have focused on the discussion of the properties of modified phenolic resins and gradually ignored the research on the synthesis processes that can affect the molecular structure and properties of phenolic resins. This review covers the synthesis processes used to prepare chemically modified phenolic resins and classifies and summarizes them. The types of modifiers, the timing in adding modifiers, and the advantages and disadvantages of different synthesis processes are considered. A possible synthesis process strategy for the preparation of different modified phenolic resins is provided, and this has a certain guiding significance for the research on high-performance phenolic resins.

关键词： Phenolic resin Chemical modification process strategy In-situ polymerization modification Pre-polymerization modification

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A Study On The Mechanical Properties Of Hybrid Parts Manufactured By Forging And Wire Arc Additive Manufacturing 23

A Study On The Mechanical Properties Of Hybrid Parts Manufac...

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23rd International Conference on Material Forming (ESAFORM)

作者： Hirtler, Markus Jedynak, Angelika Sydow, Benjamin Sviridov, Alexander Bambach, Markus Brandenburg Univ Technol Cottbus Senftenberg Chair Mech Design & Mfg Konrad Wachsmann Allee 17 D-03046 Cottbus Germany

Additive manufacturing (AM) processes such as Wire-Arc Additive Manufacturing (WAAM) are highly flexible and particularly suited for manufacturing complex geometries in small batch-sizes. In the case of large batch-sizes, the low production rate of WAAM is a bottleneck, and therefore forming processes with higher production rates are more suitable. However, forming processes such as closed die forging require dedicated tooling and hence lack the flexibility needed to produce product variants. The current study proposes to combine additive manufacturing with forging to form hybrid components with high complexity and acceptable production rates. This is particularly advantageous for parts that are produced in variants. However, the main challenge in achieving a combination of these manufacturing technologies is the design of the process chain, ensuring that the final properties meet the specifications of the part. In this regard, the process sequence of forming followed by WAAM is investigated. The base material EN AW-6082 was formed to a preform by forging, followed by the deposition of different aluminum alloys by WAAM. The evolution of mechanical properties such as hardness and microstructure was analyzed. Based on the experimental observations, strategies to improve the performance of the hybrid components are presented. (c) 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the 23rd International Conference on Material Forming.

关键词： Hybrid parts WAAM Forging process strategy

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Effect of single pulsed picosecond and 100 nanosecond laser cleaning on surface morphology and welding quality of aluminium alloy

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OPTICS AND LASER TECHNOLOGY 2020年 127卷 106197-000页

作者： Zhou, Cong Li, Honggeng Chen, Genyu Wang, Gang Shan, Zizhao Hunan Univ State Key Lab Adv Design & Mfg Vehicle Body Changsha 410082 Hunan Peoples R China Hunan Univ Laser Res Inst Changsha 410082 Hunan Peoples R China Cent South Univ State Key Lab High Performance Complex Mfg Changsha 410083 Peoples R China

Removing the oxide film and dirt on the surface of the aluminium alloy can improve the welding quality of the aluminium alloy. In this paper, the characteristics of picosecond and 100 nanosecond pulsed laser cleaning aluminium alloys are explored by changing the average laser power, spot overlap ratio and scanning trajectory overlap rate. The results show that the oxide laser removal depth and diameter are related to the average power. As the average laser power increases, the depth and diameter of the ablation pit increase. At the same average power, the nanosecond laser ablation depth is greater than the picosecond laser. To achieve good surface quality, the nanosecond laser requires a higher overlap rate than the picosecond laser. The high overlap rate results in a nanosecond laser cleaning efficiency that is much lower than that of a picosecond laser. More importantly, the surface quality obtained by picosecond laser cleaning is much better than nanosecond laser cleaning. In addition, the welding experiment shows that the laser cleaning pre-treatment can effectively improve the welding quality.

关键词： Picosecond laser Laser cleaning Surface micromorphology process strategy Welding quality

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