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Influencia del revestimiento en el fresado de piezas de aleación de aluminio de baja rigidez con sujeción local
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Robot Learning from Teleoperated Demonstrations: A Pilot Study Towards Automating Mastic Deposition in Construction Sites
Full text linkPublisher Copyright: © 2025 by the authors.The construction industry faces significant challenges due to the physically demanding and hazardous nature of tasks such as manual filling of expansion joints with mastic. Automating mastic filling presents additional difficulties due to the variability of mastic density with temperature, which creates a constantly changing environment that requires adaptive control strategies to ensure consistent application quality. This pilot study focuses on testing a new human–robot collaborative approach for automating the mastic application in concrete expansion joints. The system learns the task from demonstrations performed by expert construction operators teleoperating the robot. This study evaluates the usability, efficiency, and adoption of robotic assistance in joint-filling tasks compared to traditional manual methods. The study analyzes execution time and joint quality measurements, psychophysiological signal analysis, and post-task user feedback. This multi-source approach enables a comprehensive assessment of task performance and both objective and subjective evaluations of technology acceptance. The findings underscore the effectiveness of automated systems in improving safety and productivity on construction sites, while also identifying key areas for technological improvement.Peer reviewe
Corrigendum to “Corrosion behaviour of 316L stainless steel under stress in artificial seawater droplet exposure at elevated temperature and humidity” [Corros. Sci. 254 (2025) 113039] (Corrosion Science (2025) 254, (S0010938X2500366X), (10.1016/j.corsci.2025.113039))
No full textPublisher Copyright: © 2025 The AuthorsThe authors regret: In Fig. 3, after sensitisation at 550◦C for 150 h, carbide precipitation was not observed at the grain boundaries. However, visible topographical changes at the grain boundaries appeared as white ridges, which were revealed after etching the microstructure using the FIB XeF2 method. Additionally, impurities are depicted as black spots in Fig. 3(b). Despite the material being columnar grains, which could influence the corrosion resistance of 316 L stainless steel, are not evident. EBSD scans confirmed no columnar or preferential grain orientation related to the rolling direction, as shown in Fig. 4(a) and (b). However, the KAM maps in Fig. 4(c) and (d) demonstrate a clear distinction between samples stressed perpendicular to the rolling direction, where the proportion of mid- and high-angle grain boundaries (HAGBs) is greater compared to those stressed parallel to the rolling direction. This observation is further in Fig. 4(f), which is twice the amount shown in Fig. 4(e). Additionally, grain size analysis from EBSD scans show no significant variation across different surfaces for both non-sensitised and sensitised samples, as shown in Fig. 5. While the literature lacks a clear consensus on the impact of grain size on the corrosion resistance of 316 L stainless steel [41], the findings of Maric et al. suggest that mid- and high-angle grain boundaries influence corrosion penetration depth, a result consistentwith this study [44]. In Fig. 3, after sensitisation at 550◦C for 150 h, carbide precipitation was not observed at the grain boundaries. However, visible topographical changes at the grain boundaries appeared as white ridges, which were revealed after etching the microstructure using the FIB XeF2 method. Additionally, impurities are depicted as black spots in Fig. 3(b). Despite the material being columnar grains, which could influence the corrosion resistance of 316 L stainless steel, are not evident. The comprehensive work of Sidhom et al. further validates our choice of aging conditions. Their study demonstrated that 316 L stainless steel exhibits sensitization over a wide thermal exposure window—from 800◦C for 40 h to 500◦C for 40,000 h [46]. Our selected condition of 550◦C for 150 h falls at the lower end of this sensitization range. Microstructural analysis in our study confirmed the onset of intergranular attack at this exposure, affirming the relevance of Sidhom et al.’s thermal sensitivity mapping for predicting sensitization behaviour. The similarity in pit morphologies and evidence of preferential grain boundary attack further strengthens this connection. Corrected Text: In Figure 3, after sensitization at 550°C for 150 h, carbide precipitation was not observed at the grain boundaries. However, visible topographical changes at the grain boundaries appeared as white ridges, which were revealed after etching the microstructure using the FIB XeF2 method. Additionally, impurities are depicted as black spots in Figure 3 (b). Despite the material consisting of columnar grains, which could influence the corrosion resistance of 316 L stainless steel, these are not evident. EBSD scans confirmed no columnar or preferential grain orientation related to the rolling direction, as shown in Figure 4 (a) and (b). However, the KAM maps in Figure 4 (c) and (d) demonstrate a clear distinction between samples stressed perpendicular to the rolling direction, where the proportion of mid- and high-angle grain boundaries (HAGBs) is greater compared to those stressed parallel to the rolling direction. This observation is further confirmed by the total amount of mid- and high-angle grain boundaries in Figure 4 (f), which is twice the amount shown in Figure 4 (e). Additionally, grain size analysis from EBSD scans shows no significant variation across different surfaces for both non-sensitized and sensitized samples, as shown in Figure 5. While the literature lacks a clear consensus on the impact of grain size on the corrosion resistance of 316 L stainless steel [41], the findings of Maric et al. [44] suggest that mid- and high-angle grain boundaries influence corrosion penetration depth, a result consistent with this study. The comprehensive work of Sidhom et al. [46] further validates our choice of aging conditions. Their study demonstrated that 316 L stainless steel exhibits sensitization over a wide thermal exposure window—from 800°C for 40 h to 500°C for 40,000 h. Our selected condition of 550°C for 150 h falls at the lower end of this sensitization range. Microstructural analysis in our study confirmed the onset of intergranular attack at this exposure, affirming the relevance of Sidhom et al.’s thermal sensitivity mapping for predicting sensitization behaviour. The similarity in pit morphologies and evidence of preferential grain boundary attack further strengthens this connection. The authors sincerely apologize for any inconvenience caused by the issue. We appreciate your understanding and are committed to addressing any concerns promptly
The Characterization and Delineation of the Material Cultural Heritage Sector in Europe
Full text linkPublisher Copyright: © 2025 by the authors.In recent decades, the European policy on material cultural heritage (MCH) has shifted from a primary focus on preserving heritage elements to emphasizing the value that can be derived from them. This trend has led to an interest in quantifying the impact of cultural heritage on economic activity. However, determining the magnitude of this impact is not feasible without first defining the range of activities included in the MCH sector. This article reports the findings of a study to delineate the MCH sector. Combining a tight alignment with economic statistics categories and explicit endorsements from sector experts, the novelty of this delineation lies in the systematic application of the principle of exhaustiveness—recognizing all activities related to MCH regardless of their artistic, historical, or cultural content—while its practicality is ensured by mapping directly onto the categories used to compile European official statistics. Finally, characterizing the activities that constitute the MCH sector is not merely a conceptual exercise, it has direct practical implications, providing the indispensable basis for rigorous sectoral accounting consistent with national accounts standards.Peer reviewe
Machinability of Waspaloy: an investigation of cutting forces and tool wear in turning
Full text linkPublisher Copyright: © The Author(s) 2025.The machinability of Waspaloy, a nickel-based superalloy widely used in aerospace applications due to its excellent mechanical and thermal properties, presents significant challenges during machining processes. This study experimentally investigates the influence of two heat treatment conditions (solution annealing and age hardening) as well as the effect of coolant pressure (conventional and high-pressure cooling) on cutting forces, tool wear, and chip morphology during the turning of Waspaloy. Quantitative and qualitative analyses were performed on tool wear types including rake face, flank, and notch wear, while chip morphology was also evaluated to gain deeper insight into the machinability behavior. The results show that high pressure cooling (HPC) improves machinability by reducing cutting forces and minimizing wear, particularly in solution-annealed, large grain samples. In contrast, age-hardened specimens with conventional cooling exhibited the highest wear and cutting forces due to increased hardness and insufficient thermal dissipation. Overall, the findings highlight that both coolant pressure and heat treatment significantly influence the wear mechanisms and cutting performance, with HPC and lower hardness conditions enhancing the machinability of Waspaloy. This work uniquely combines the effects of dual heat treatments and cooling pressures to comprehensively evaluate their combined impact on Waspaloy machinability, providing new insights into optimizing cutting performance and tool life for this challenging superalloy.Peer reviewe
Corrosion behaviour of 316L stainless steel under stress in artificial seawater droplet exposure at elevated temperature and humidity
Full text linkPublisher Copyright: © 2025 The AuthorsChloride-induced pitting corrosion and stress corrosion cracking could present potential damage mechanisms in high activity waste (HAW) containers made of austenitic stainless steels operating at room temperature, elevated temperature, and humidity. In this paper, atmospheric corrosion tests were conducted on cold-rolled 316 L stainless steel (SS) specimens—both sensitised and non-sensitised—subjected to varying levels of applied stress (ranging from 0 to 1.5 times the yield strength, σy) in the presence of 0.546 mol/L artificial seawater droplets. A subset of the samples was thermally sensitised at 550°C for 150 hours. The experiments were conducted at room temperature (RT) and humidity levels, and at 50°C and 60 % relative humidity (RH), using a custom-made environmental corrosion chamber for 672 hours. Stress was applied using a 4-point bending rig, and artificial seawater droplets were delivered via a SS 304 medical syringe needle. Correlative microscopy (SEM and EBSD), optical profilometry, and dry vapor etching techniques revealed pit initiation sites and growth predominantly occurring at grain boundaries along the rolling direction. Sensitisation and increased applied stress led to a rise in both the number and size of corrosion pits, as observed in experiments conducted both at room temperature and in the corrosion chamber.Peer reviewe
Optical waveguides fabrication on flexible PMMA substrate using aerosol-jet printing for automotive and aeronautical applications
No full textPublisher Copyright: © 2025 IEEE.Integrated photonic devices are powerful tools, offering advantages for many applications as data & telecommunications, biosensing, quantum computing, 6G networks, HPC…. However, traditional fabrication methods are costly limiting their commercial use. Recent studies on 3D additive fabrication have demonstrated rapid and automated one-step production of optical passive devices (waveguides, couplers…), allowing new opportunities for large-scale, eco-friendly and flexible photonic sub-systems [1]. For that, different deposition techniques have been developed such as fused deposition modeling (FDM), inkjet printing, stereolithography (SLA), and two-photon polymerization (2PP). 2PP presents high lateral resolution (∼ 100 nm) and enables to perform large-scale but time-consuming fabrication remains challenging. Ink-based printing methods provide a good balance between resolution and processing time [2].Peer reviewe
Toward Industry 5.0: A Neuroergonomic Workstation for a Human-Centered, Collaborative Robot-Supported Manual Assembly Process
No full textPublisher Copyright: © 1994-2011 IEEE.This article brings the concept of neuroergonomic workcell with its essential components (psychological and physical assessment, nonphysical, physical, and strategic support) for improving the well-being and productivity of workers at their workplaces. A proof-of-concept neuroergonomic human-centered workstation is demonstrated in a real factory environment for a typical industrial laborious task: assembly. The pilot workstation introduces a fully portable, noninvasive electroencephalogram (EEG)-based users' mental workload assessment, a nonobtrusive human-machine interface, illustrative graphical assembly guidelines, a collaborative robot assistant, and an intelligent task scheduler. The subjects' performance and workload were assessed using a NASA Task Load Index questionnaire, three EEG workload indices, hand gesture detection accuracy, the number of errors, and task duration. We identified a notable correlation between multiple EEG indices of workload and NASA score results. The new workstation boosts productivity with better performance and fewer errors on the assembly line while reducing mental demand. Its modular design ensures easy integration and adaptation into factory settings, optimizing manual assembly processes.Peer reviewe
Integration of Drone-Based 3D Scanning and BIM for Automated Construction Progress Control
Full text linkPublisher Copyright: © 2025 by the authors.The work progress control is a key aspect for correcting deviations in construction, but currently is a task still carried out very manually by personnel moved to the execution place. This work proposes to digitize and automate the procedure through the combination and contrast of digital models of the actual state of the work and the theoretical planning. The models of the real situation are generated from the laser scanning executed by drones, the theoretical planning is reflected in the BIM4D models of the project, and their combination is automated with Feature Manipulation Engine (FME) visual programming routines. A web-based digital twin platform allows access to the end user of the service in an agile way. The methodology developed has been validated with its application on a residential building in the structural erection phase in Helsinki (Finland).Peer reviewe
Advanced Battery Test Bench For Realistic Vehicle Driving Conditions Assessment
No full textPublisher Copyright: © 2025 IEEE.This study presents a battery test bench, adaptable to different battery types, designed to replicate real-world vehicle operating conditions but also constant charge and discharge configurations. It incorporates on-board communication via the Controller Area Network (CAN). Unlike conventional battery test setups, which typically focus on single cells and constant current profiles, this test bench evaluates battery packs under dynamic current loads, allowing simulation of real-world driving conditions such as the Worldwide Harmonized Light Vehicles Test Procedure (WLTP) or other driving cycles. The test bench also has an ambient temperature control from 5°C to 60°C. It provides accurate data acquisition of cell voltage and current, cell and ambient temperature, and resistance at multiple levels - pack, string, and individual cells for a more complete understanding of battery behavior. The system is controlled by a Python-based code that enables real-time monitoring and automation. The platform enables improved battery management system (BMS) validation, energy optimization strategies, and overall performance analysis. Although there are many battery cycling databases in the literature, there is a lack of databases that address the conditions that batteries must endure during realistic driving cycles.Peer reviewe