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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...
According to the shortcomings of the nonlinear cumulative damage models which are based on material physical properties degradation, these models ignored the effects of load interaction, but the effects of load interaction really play a very important role on fatigue damage by studying the theories accounting for load interaction effects. In this paper, a new model is proposed to consider the effects...
Design of complex system often involves a multitude of decision variables and parameters. In order to relieve the computational burden, manage the complexity in design processes, and achieve concurrent analysis and design, a complex system can oftentimes be decomposed into several subsystems with hierarchical relation according to their functional attributes, physical structures, or scale magnitudes...
Aiming to improve the predictive ability of Walker model for the life of turbine disc and taking an aircraft engine turbine disc made of GH4133 as the application example, this paper investigates the approach on probabilistic fatigue life prediction when considering parameters uncertainty inherent in the life prediction model, i.e. Walker model. Firstly, experimental data are used to update the model...
The residual life prediction of aero-engine is important for ensuring flight safety and reducing operating costs for airlines. Since there are varied performance parameters of aero-engine, it is difficult to use comprehensively these performance parameters to predict the residual life. This paper exploits Support Vector Regression Machine (SVR) in predicting the trend of varied performance parameters...
Key part failure of the vehicle engine often leads to its failure, while the cylinder liner failure is the main reason. In this paper, the basic theory of vehicle engine tribology was applied to analysis wear reasons and wear rules of cylinder liner. Meanwhile, the application of the ideal gas equation explored the relationship between the state of the cylinder liner wear and air leakage, which determined...
For the usual failure mode of structural components under variable loading, fatigue life prediction is very important for the selection, design, and safety assessments of these components. The linear damage model (Miner's rule) is used most widely for life prediction in practical engineering application. However, the fatigue damage caused by small loads cannot be ignored, especially when the load...
Many structures are subjected to variable amplitude loading in engineering practice. The foundation of fatigue life prediction under variable amplitude loading is how to deal with the fatigue damage accumulation in the case of two-level loading. A non-linear fatigue damage accumulation model which can explain the influence of loading sequences was proposed in earlier literature, but the model cannot...
Remaining useful life (RUL) is important to manage life circles of machineries and reduce maintenance cost. Support vector machine (SVM) is a promising algorithm for RUL prediction because of its advantages to deal with small size of training sets and multi-dimensional data. Recently, many methods of RUL prediction using SVM have been proposed. In this paper, a review over 60 references within the...
Engineering experience reminds us of the importance of uncertainty analysis in fatigue reliability based design. In the present paper, according to the procedure of fatigue reliability analysis, parameter uncertainty and model uncertainty are studied and the corresponding solutions are reviewed. The aim of parameter uncertainty analysis is to obtain reliability index to quantify uncertainties imported...
Improved fatigue life prediction methods will assist in reducing life cycle costs and increasing the availability of mechanical components. These methods include Stromeyer function, Basquin law, Manson-Coffin law, frequency modified damage function (FMDF) model, strain range partition (SRP) and so on. However, different models are applied to assess the life under high cycle fatigue (HCF) and low cycle...
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