Procedia CIRP最新文献

{"title":"Investigating the reparability of fusion bonded metal-plastic composites for improved circularity","authors":"Christian Gundlach ,&nbsp;Klaus Dilger ,&nbsp;Sven Hartwig","doi":"10.1016/j.procir.2024.09.018","DOIUrl":"10.1016/j.procir.2024.09.018","url":null,"abstract":"<div><div>Multi-material structures have long been established for various components in the automotive industry in the context of lightweight construction, with metal and fiber-reinforced plastic in particular being advantageously joined together in the form of so-called hybrid designs. The joining technology plays a decisive role here with regard to the hybrid component's performance and aging resistance. However, the complexity of component manufacture and the feasibility of subsequent repair, reprocessing and recycling concepts are largely determined by the choice of joining technology. The aim of the present work is to investigate the reparability of joints produced fusion bonding on a fundamental level. Lap shear specimens consisting of a laser-structured, metallic joining partner and a fiber-reinforced thermoplastic (FRTP) sheet are used as a basis for evaluation. The test sequence comprises an initial joining and three consecutive repair processes of the joint by means of fusion bonding, with a destructive lap shear test taking place after each joining process. Two repair approaches (with and without an additional polyamide-6 film) are investigated. Over three repair processes, a slightly decreasing trend in lap shear strength is found if the repair is carried out without additional polyamide-6 film. Using a polyamide-6 film during the repair leads to higher strength in every case tested. Thermal analysis and microindentation on the FRTP substrate takes place in order to quantify the influence of the heating required for repair. A negative effect on the degree of crystallinity and the strength of the polyamide-6 matrix close to the steel-FRTP interface is found. Nevertheless, based on the criteria derived from DIN EN 45554, the conclusion is drawn that the reparability of metal-FRTP joints produced by fusion bonding is possible on a sample scale. For future work, a more in-depth study of the joining surfaces, especially the metal part, as well as the inclusion of an aging step before each lap shear test should be considered.</div></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":"131 ","pages":"Pages 113-118"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"From goals to actions: Insights on how European SMEs plan and implement sustainability projects","authors":"Nelli Kononova ,&nbsp;Max Juraschek ,&nbsp;Claudia Franzè ,&nbsp;Clara Behrend ,&nbsp;Jaione Agirre ,&nbsp;Oscar Revilla ,&nbsp;Gabriela Ventura Silva ,&nbsp;Christoph Herrmann","doi":"10.1016/j.procir.2024.12.069","DOIUrl":"10.1016/j.procir.2024.12.069","url":null,"abstract":"<div><div>Rising energy and material costs, new reporting requirements, limited resources, increasing product quality demands as well as higher customer expectations on climate action and social standards urge the manufacturing industry to continuously take action. Especially small and medium-sized enterprises (SMEs) are challenged by the need to identify the relevant action fields for their sustainable transition in the midst of political initiatives such as the “Green Deal”.</div><div>In practice, sustainability projects experience different consecutive stages and their goals and content might change over the course of the project. Based on data from the EU-funded “greenSME” fast-track sustainability projects, a self-assessment of the sustainability pathway of European SMEs is developed and conducted. This includes development of the action plan and the final implementation of the actions. Within the actions, companies could have decided to concentrate on one or several sustainability dimensions with the help of advanced technologies, social innovation or environmental services. Findings reveal discrepancies between the initial self-assessment goals and the practical implementation outcomes among European manufacturing SMEs. The highest implementation rates were observed in areas such as worker skills and training (105%), Life Cycle Assessment (85%), resource management (42%), and Internet of Things (39%).</div></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":"135 ","pages":"Pages 588-593"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strategies and action plans for Scandinavian municipalities and their climate goals relating to circular economy","authors":"Thea Mork Kummen ,&nbsp;Rolf André Bohne ,&nbsp;Jardar Lohne ,&nbsp;Freja Nygaard Rasmussen","doi":"10.1016/j.procir.2024.12.071","DOIUrl":"10.1016/j.procir.2024.12.071","url":null,"abstract":"<div><div>The building and construction sector is responsible for extracting half of the virgin materials produced, and one-third of global greenhouse gas emissions. The public sector and municipalities account for a significant part of the building stock and can influence the building sector’s emission reductions and resource uses. This study aims to investigate strategies and action plans towards emission reductions related to circular economy initiatives in Scandinavian municipalities. Further, the study identifies effective practices and hindrances towards these circularity goals. The method of this study combines qualitative and quantitative research methods. Data was collected through analysis of existing climate strategies. The data was analyzed and sorted into categories, and further sorted with goals, tools and focus areas. The study reveals an increased focus and inclusion of circular economy principles and measures. Initiatives in strategies are mainly focused on waste management and recycling, rather than concrete measures for reuse. The study also showed that there is significant variation in the structure and content of different strategic documents. Recommendations for municipalities to improve the circular economic measures through action plans are provided. Additionally, the study underscores the importance of using Key Performance Indicators (KPIs) to ensure the implementation of circular goals in municipal strategies.</div></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":"135 ","pages":"Pages 600-605"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Copyright Page","authors":"","doi":"10.1016/S2212-8271(25)00665-1","DOIUrl":"10.1016/S2212-8271(25)00665-1","url":null,"abstract":"","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":"135 ","pages":"Page ii"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design interventions to reduce embodied emissions and in-use energy losses of radial switched reluctance motors for electric vehicles","authors":"Frederick Follows ,&nbsp;Julian M. Allwood","doi":"10.1016/j.procir.2025.04.002","DOIUrl":"10.1016/j.procir.2025.04.002","url":null,"abstract":"<div><div>The transport sector is rapidly electrifying, so the emissions of vehicles in-use will reduce in line with the grid. The embodied emissions of motor manufacture are therefore gaining more attention. This work investigates design interventions for an automotive switched reluctance motor (SRM), with the aim of improving its environmental performance compared to permanent magnet (PM) machines. The components investigated are the coils, stator, case, and rotor components (magnetic pole pieces, frame and shaft), considering the materials, manufacturing processes, and scrap waste. The effect of design choices on embodied emissions and in-use energy losses over a vehicle lifetime are determined from a representative duty cycle. In both categories significant savings are identified. Individual changes may reduce embodied emissions by 33% and in-use losses by 26%, while combining interventions can at best lead to savings of 80% and 55% respectively.</div></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":"135 ","pages":"Pages 21-26"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Proposal of a design tool combining performance criteria and circularity potential – A flexible film packaging application","authors":"Celina V. de Melo ,&nbsp;Talissa G. Albertini ,&nbsp;Alex C. Bottene ,&nbsp;Daniel G. da Costa","doi":"10.1016/j.procir.2024.12.009","DOIUrl":"10.1016/j.procir.2024.12.009","url":null,"abstract":"<div><div>The increasing production of plastic worldwide requires different alternatives to prevent this material from polluting the planet. Flexible polymeric packaging, for food applications holds a significant share, mainly due to the associated linear usage cycle. Therefore, developing new products with the potential for circularity is a goal of suppliers in this important supply chain. This paper proposes a packaging design methodology that considers performance criteria and the circularity potential of the final product in its conceptual phase. The developed tool combines the material selection methodology proposed by Ashby [8] and the circularity indicator MCI [7], proposed by Ellen MacArthur Foundation. The result is a decision flowchart, consisting of the stages: gathering packaging requirements (mechanical and protection), selecting materials that meet the requirements, constructing the matrix of possibilities, proposing packaging concepts, evaluating circularity potential, and ranking according to cost criteria. The tool was evaluated using a case study methodology, conducted in partnership with a representative company of the flexible packaging supply chain. Thus, technical and processing decision attributes were included in the flowchart, bringing industrial contributions to this design tool and proving the feasibility of its use in the development process of new packaging for food applications.</div></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":"135 ","pages":"Pages 95-100"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative Environmental Impact Analysis of Friction-based Additive Manufacturing Techniques","authors":"Simone Amantia ,&nbsp;Kirill Kalashnikov ,&nbsp;Giuseppe Ingarao ,&nbsp;Rosa Di Lorenzo ,&nbsp;Gianluca Buffa ,&nbsp;Livan Fratini","doi":"10.1016/j.procir.2024.12.043","DOIUrl":"10.1016/j.procir.2024.12.043","url":null,"abstract":"<div><div>In this work, two variants of solid-state friction-based additive processes, Friction Surfacing Deposition and Friction Stir Additive Manufacturing, were compared in terms of their environmental impact. A comparative Life Cycle Assessment analysis was performed, alongside experimental quantification and analysis of energy and resource flows for each process. The energy analysis revealed that the friction stir additive manufacturing is a more energy-consuming technology than surfacing process due to the significantly lower tool feed rate required to produce sound welds. It was determined that the most significant contributor to the environmental impact of both methods is the process scrap. Strategies to reduce material waste were proposed for each technology, tailored to the specific characteristics of their implementation. Furthermore, an additional LCA model was developed to evaluate strategies for minimizing FSAM process scrap.</div></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":"135 ","pages":"Pages 456-461"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal simulations in additive manufacturing using machine learning","authors":"Shradha Ghansiyal ,&nbsp;Svenja Ehmsen ,&nbsp;Matthias Klar ,&nbsp;Jan C. Aurich","doi":"10.1016/j.procir.2024.12.029","DOIUrl":"10.1016/j.procir.2024.12.029","url":null,"abstract":"<div><div>Thermal simulations are critical in additive manufacturing to ensure product quality, structural integrity, and optimized designs without the need for repeated real experiments. Conventionally, these simulations utilize numerical-based methods, which can often be time-consuming and resource-intensive, especially as the problem domain expands. To address these limitations, a data-driven framework is proposed. In this work, a methodology to train and validate machine learning-based models for thermal simulation tasks is outlined. For this purpose, an exemplary 2D simulation scenario in laser-based powder bed fusion is considered. Furthermore, the developed framework is utilized in parameter selection with the aim to obtain an energy-efficient process.</div></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":"135 ","pages":"Pages 344-349"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A data augmentation algorithm for surface inspection in point cloud data","authors":"Daan Büchner ,&nbsp;Ole Schmedemann ,&nbsp;Thorsten Schüppstuhl","doi":"10.1016/j.procir.2025.02.142","DOIUrl":"10.1016/j.procir.2025.02.142","url":null,"abstract":"<div><div>Due to the high standards in aircraft maintenance, high resolution sensors, such as white light interferometers, are needed. Those sensors scan surfaces in nanometer scale and generate point clouds. This data can be used to detect surface defects. Such anomalies should be identified during the inspection process to assess the current condition of the workpiece. Deep learning algorithms can be used to evaluate the data. However, in the domain of 3D data, the challenge of obtaining training data is amplified due to the time-consuming labeling process. Therefore, this work introduces an algorithm that combines surface features, like cracks, into surface data to generate new labeled training data. The resulting dataset is then used to train a deep learning algorithm to segment the cracks in the point cloud data. The results indicate that the augmented data enhances the training process.</div></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":"134 ","pages":"Pages 437-442"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144291044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing Assembly Instruction Generation for Cognitive Assistance Systems with Large Language Models","authors":"Benedikt Kelm ,&nbsp;Paul Hubert Haas ,&nbsp;Simon Jochum ,&nbsp;Lennard Margies ,&nbsp;Rainer Müller","doi":"10.1016/j.procir.2025.03.010","DOIUrl":"10.1016/j.procir.2025.03.010","url":null,"abstract":"<div><div>Cognitive Assistance Systems enhance manual assembly by shortening learning cycles and allowing workers to handle a wider range of products. However, generating assembly instructions remains time-consuming, particularly in environments with high product variability. This paper presents a novel approach to automate and streamline this process using MTM-based standardized instruction texts and Large Language Models via the OpenAI API. By deriving instructions from MTM analyses, a unified syntax and structure can be realized, improving consistency and efficiency. The integration of GTP-4o further enables the automatic generation of context-specific warnings and error notifications. Model fine-tuning and prompt engineering play a pivotal role in this approach, allowing the generation of precise instructions. The evaluation, based on the BLEU and METEOR scores, focuses on the assessment of the technical functionality and the quality of the generated outputs and shows promising results that highlight the potential of this approach for improving the automated generation of standardized assembly instructions for Cognitive Assistance Systems.</div></div>","PeriodicalId":20535,"journal":{"name":"Procedia CIRP","volume":"134 ","pages":"Pages 7-12"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}