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Assessment of products for optimal lifetime
CIRP Annals, 2008Sustainable manufacturing requires products to be developed with a predetermined useful life, which will minimise resource usage and environmental impact based on their intended End-of-Life strategy. Long term implementation of this concept requires this objective to be incorporated as another target during the early product development so that each ...
S. Kara +3 more
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Lifetime Assessment of Aging Materials
MTZ worldwide, 2018Materials subjected to high-temperature service conditions will change their microstructure with time. Associated with this aging process is a change of mechanical properties as well as a change of damage mechanisms. Within the scope of the FVV project Aging and Lifetime, Fraunhofer IWM in Freiburg and BAM in Berlin (both Germany) experimentally ...
Philipp von Hartrott +3 more
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Lifetime assessment of engineering thermoplastics
International Journal of Engineering Science, 2012Abstract The life expectancy of thermoplastics in durable applications varies from about 10 years to 50 and even 100 years in certain cases. It calls for an accelerated testing of material and structures. The challenges of accelerated testing for lifetime are (a) to reproduce the mechanisms of field failures and (b) to develop a reliable procedure ...
Alexander Chudnovsky +3 more
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Assessment of lifetime of railway axle
International Journal of Fatigue, 2013Abstract Main laws of influence of stress ratio on fatigue crack growth rate in the material of railway axles were revealed and statistical distributions of characteristics of cyclic crack’s resistance for steel were determined. The technique of modelling of fatigue crack growth in the material of railway axle under regular and random loading was ...
O. Yasniy +4 more
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Assessment of Lifetime Participation in Cognitively Stimulating Activities
Journal of Clinical and Experimental Neuropsychology, 2003Cognitively stimulating experience is thought to contribute to cognitive reserve. We constructed a questionnaire consisting of 25 items about frequency of participation in cognitive activities across the life span and administered it to two groups of older persons.
Robert, Wilson +2 more
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Psychometric Properties of the Lifetime Assessment of Violent Acts
Violence and Victims, 2017The Lifetime Assessment of Violent Acts (LAVA) inventory provides estimates of the frequency, triggers, and consequences (including injuries to others) of historic acts of aggression. The LAVA also identifies the situational contexts in which prior violence was triggered and allows classifications based on past reactive, intimate partner, alcohol ...
Alan R, King +2 more
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Lifetime assessment method based on step-stress accelerated lifetime test
2017 Prognostics and System Health Management Conference (PHM-Harbin), 2017For the old product with the field using period, the single-stress & timing-conversion step-stress accelerated life test (SSALT) is carried out to derive the product's lifetime by using the field using data and accelerated life data. The product's lifetime is assumed to obeying to Weibull distribution with double parameters.
Cai Zhongyi +3 more
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Lifetime Assessment at High Temperatures
1998A classical power plant was generally expected to last for about 20 years or more (nuclear plant for 35–40 years). It would not normally be in operation continuously throughout the whole of this time, however, and the design was usually based on a life of 100000 hours, which is about 11 years.
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Strength Degradation and Lifetime Assessment
2017The failure mode of composite cylinder depends on the competition of all parallel running degradation and failure mechanisms. In time-lapsing test procedures under laboratory conditions, these mechanisms behave differently from those under real operational conditions. For this, the main features of degradation are discussed as a phenomenon in Sect. 4.1.
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Assessment of vacuum lifetime in nL-packages
2005 7th Electronic Packaging Technology Conference, 2005Vacuum wafer bonding technology provides a number of very effective techniques to produce low-cost, hermetic sealed packages for micromachined sensors and actuators. Beside the protection of the device from outside environmental stresses, the package must also provide a cavity ambient compatible with the device performance and reliability.
W. Reinert, D. Kahler, G. Longoni
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