20.500.12556/RUL-177272 A cradle-to-cradle life cycle assessment framework linking machining parameters, tool life and part durability Machining operations influence sustainability not only through immediate energy and resource use but also through their effects on tool longevity and part durability. Conventional life cycle assessments (LCAs) of machining typically adopt gate-to-gate boundaries, overlooking how machining parameters affect surface integrity, fatigue life, and the frequency of cutting-tool and machined component replacement. This study develops a novel cradle-to-cradle LCA framework that incorporates machining-induced tool wear and part durability into system-level environmental impacts. The approach is demonstrated through a real case study of drilling the CFRP/Ti6Al4V stacks used for the Boeing 787 fuselage, comparing dry drilling with liquid carbon dioxide combined with minimum quantity lubrication (LCO₂+MQL). Experimental tests quantified energy demand, resource consumption, tool life, and hole quality, while part durability was evaluated via fatigue testing and finite element simulations. Results show that the cutting tool production was the dominant contributor to the overall environmental impact. Despite requiring additional auxiliary inputs, LCO₂+MQL drilling reduced overall environmental impacts by 60–70 % relative to dry drilling, due to extended tool life and improved component service life. These findings demonstrate that coolant-assisted machining, when durability and tool-life effects are considered, yields a net environmental benefit. The proposed framework provides a transferable method to expand LCAs beyond gate-to-gate boundaries by integrating the influence of machined part quality on durability and in-service repairs, enabling cradle-to-cradle assessments that better capture the system-level implications of machining decisions. life cycle assessment cradle-to-cradle sustainable manufacturing cryogenic machining part durability aeronautics composite/titanium stacks študija življenjskih ciklov od zibelke do zibelke trajnostnostna proizvodnja kriogensko obdelovanje življenjska doba komponent letalstvo kompozitno-titanovi laminati true false true Angleški jezik Slovenski jezik Članek v reviji 2025-12-19 10:04:01 2025-12-19 10:04:09 2025-12-30 13:22:30 0000-00-00 00:00:00 2025 0 0 16 str. Vol. 84 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 502.131.1:621 1878-6642 10.1016/j.jmsy.2025.11.021 262239235 RAZ_Rodriguez_Bogajo_Inigo_2025.pdf RAZ_Rodriguez_Bogajo_Inigo_2025.pdf 1 17BC60A18ED2BB041F83D847F5387C27 146aeff47a732fcddd18a559c435ed030c2d428d4fa8fbdeec823a2a232ccc1b 719c59c5-dcb9-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=224212 https://www.sciencedirect.com/science/article/pii/S0278612525002821?via%3Dihub 1 3cd4a748-dcb9-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=224211 Fakulteta za strojništvo 0 0 0