44676 2018 eng 04018016-1 04018016-8 4 144 article American Society of Civil Engineers 1 -- -- -- In order to study the time- and temperature-dependent long-term behavior of metal seals, experimental investigations on special metal seals have been carried out at five different temperatures in a temperature range between 20 and 150°C for more than 7 years. Experimental results indicate a noticeable change of relevant sealing properties like seal force and usable resilience depending on time and temperature. In this study, the metal seals are treated as a homogeneous material block so that the identified decrease in seal force can be treated as a material relaxation effect. For the time-dependent behavior of seal force, an enhanced power-law model is introduced for the first time and is compared with the currently used power-law model. Additionally, regarding the influence of temperature, the timetemperature superposition principle is applied to metal seals for the first time with a clearly defined process. Thus, possible mistakes in the application of principle could be avoided. The introduced method is widely available for different applications regarding effects the principle with time and temperature. Journal of Engineering Mechanics https://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0001424 0733-9399 10.1061/(ASCE)EM.1943-7889.0001424 12.04.2018 Linan Qiao Uwe Herbrich Sven Nagelschmidt eng uncontrolled Metal seals eng uncontrolled Relaxation eng uncontrolled Thermo-viscoplasticity eng uncontrolled Time-temperature superposition Angewandte Physik Verlagsliteratur Datei im Netzwerk der BAM verfügbar ("Closed Access")