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This paper mainly studies the creep characteristic of nickel-base superalloy GH4169 under high temperature. From the perspective of modeling methods, based on the continuum damage mechanics, a creep life prediction model was proposed to predict the creep life of metal materials in both uniaxial stress state and multiaxial stress state, and experimental verification is done. Moreover, from the perspective...
Many imperfect maintenance models have been developed to mathematically characterize the efficiency of maintenance activity from various points of view. However, the adequacy of an imperfect maintenance model must be validated before it is used in decision making. The most adequate imperfect maintenance model among the candidates to facilitate decision making is also desired.
To better describe the reality that repaired systems are neither in “as good as new” nor “as bad as old” conditions, many imperfect maintenance models have been developed in the past decades to mathematically characterize the maintenance quality from various points of view. However, without complete knowing the potential physics of failures and the mechanism of improvement from repair, but only with...
Based on some practical problems in industrial engineering, a species of two-unit parallel repairable system model is introduced in this paper. The prominent feature of the model is described as follows: if a repair time is sufficiently short (less than some threshold value) that does not affect the system operation, i.e. the effect could be ignored, the system can be considered as being operating...
Many mechanical components exhibit more than one failure mode; and not all components under study have been exposed to similar operating conditions. For example, components may have been used in different operating environments or there may be differences in design and/or material. In these cases, life time data of components would not fall on a straight line on a Weibull probability paper (WPP),...
Grid computing is a newly developed technology. Although the developmental tools and techniques for the grid have been extensively studied, the reliability of grid service can not satisfy the real-world application requirements. To resolve this problem, this paper introduces a fault recovery mechanism into grid nodes and gives a constraint on recovery amount. Moreover, a multi-objective optimization...
Many existing software reliability models are based on the assumption of statistical independence among successive software failures. In reality, this assumption could be easily violated. In recent years, efforts have been made to relax this unrealistic assumption and a software reliability modeling framework considering failure correlation was developed by Goseva-Popstojanova and Trivedi. However,...
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