TAILIEUCHUNG - Assessing Product Reliability_3

Tham khảo tài liệu 'assessing product reliability_3', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . Eyring ENGINEERING STATISTICS HANDBOOK hW tools raids lỉEÂtCH BACK Nixf 8. Assessing Product Reliability . Introduction . What are some common acceleration models The Eyring model has a theoretical basis in chemistry and quantum mechanics and can be used to model acceleration when many stresses are involved Henry Eyring s contributions to chemical reaction rate theory have led to a very general and powerful model for acceleration known as the Eyring Model. This model has several key features It has a theoretical basis from chemistry and quantum mechanics. If a chemical process chemical reaction diffusion corrosion migration etc. is causing degradation leading to failure the Eyring model describes how the rate of degradation varies with stress or equivalently how time to failure varies with stress. The model includes temperature and can be expanded to include other relevant stresses. J The temperature term by itself is very similar to the Arrhenius empirical model explaining why that model has been so successful in establishing the connection between the Ạ H parameter and the quantum theory concept of activation energy needed to cross an energy barrier and initiate a reaction . The model for temperature and one additional stress takes the general form for which S1 could be some function of voltage or current or any other relevant stress and the parameters a ỉhH B and C determine acceleration between stress combinations. As with the Arrhenius Model k is Boltzmann s constant and temperature is in degrees Kelvin. If we want to add an additional non-thermal stress term the model becomes http div898 handbook apr section1 1 of 3 5 1 2006 10 41 31 AM . Eyring and as many stresses as are relevant can be included by adding similar terms. Models with multiple stresses generally have no interaction terms -which means yoi can multiply acceleration factors due to different stresses Note that the general Eyring .

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