WE.1.E || Green-Lean-Digital

Dazer, Martin; Ostertag, Andreas; Herzig, Thomas; Albrecht, Stefan; Bertsche, Bernd

Technical systems in mechanical as well as civil engineering have to be designed in a way that the requirements regarding service life are met with high reliability. This is the only way to ensure safe product operation and a safe building use. In many cases the design is still based on single events, such as extreme load scenarios and additional safety factors from industrial standards in order to ensure reliability, which is accompanied by a high degree of oversizing. This means, that significantly more resources are consumed than actually needed. To prevent reliability from being ensured solely by oversizing, reliability criteria must be supplemented by the claim for sustainability starting at the product design. On one hand, profound reliability considerations concerning reliability assurance make safety factors obsolete, which neglect the scattering of the lifetime. On the other hand, oversizing is limited by the claim for sustainability. The overall result is a sustainable design that meets the requirements while ensuring reliability at the same time. Within this work, two case studies are introduced to show the trade-off in which the design has to be developed and how an overall solution proposal of the trade-off can look like. In one study the building design is addressed in civil engineering and in another the gear design, which represents the mechanical engineering sector. In both case studies, the enormous savings in terms of resources and greenhouse gases emitted is shown if both, reliability and sustainability are simultaneously considered starting in the early product design phase.