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On the basis of the continuum damage mechanics, a new low cycle fatigue damage accumulation model, which takes the coupling effect of damage and strain into account, is proposed. The model has some practical values because of its clear physical meanings. With the analysis of low-cycle test data for a kind of material often used in aero engine, we know that the prediction data derived from this new...
This paper presents a new non-linear fatigue damage accumulation model based on continuum damage mechanics. The proposed model has been formulated to take into account the damage evolution of material under different loading levels and the effects of loading sequence on fatigue life. In additional, the model has also considered the mean stress in its damage evolution with fewer parameters. Experimental...
The paper presents a possibility of observation of singular values evolving in time as quantities carrying diagnostic information. To prove the usefulness of singular values for this purpose many numerical simulations have been conducted. It has been proved that when observing changes of singular values obtained from SVD during the lifetime of a machine, the appearance of reversal points must be taken...
This paper presents a method for determining a minimal cost of a multi-state system subject to a corrective maintenance. The minimal cost is achieved by finding an optimal load distribution from a sequence of possible combinations. The cost considered is a combination of downtime cost (loss of productivity) and repair cost. The former is affected by a penalty value. The element failure rate depends...
In order to study the operating life of structural components under the condition of load, the tensile damage experiments of carbon/epoxy composite are done in this paper. Then the mathematic model of the damage development of carbon/epoxy composite is built based on the experimental signal parameters, and then the reliability of carbon/epoxy composite is also discussed in this paper. Finally, the...
Silicon is one of the most commonly used materials for functional structure of microelectromechanical system. Its application is seriously restricted by reliability problems. To study the mechanical properties of silicon microstructures, an off-chip test device is designed, mainly consisting of piezoelectric drive, force sensor and displacement sensor. Secondly, a microstructure for bending test is...
In today's global environment, accelerated life testing is becoming a competitive advantage when time spent from conceptual stage to the final product development needs to be minimized (project costs and development time) in order to be successful. Using accelerated life testing techniques for mechanical and structural applications have strong challenges when defining the actual operational loading...
Combining a nonlinear damage accumulation model, a probabilistic S-N curve and one-to-one probability density functions transformation technique, a general probabilistic methodology for modeling damage accumulation is developed to analyze the fatigue reliability in this paper. The damage accumulation is characterized as a distribution in a general degradation path, which captures a nonlinear damage...
The methods of the reliability prediction and optimization of complex technical systems related to their operation processes are presented. The general model of the reliability of complex technical systems linking the semi-Markov modeling of their operation processes with the multi-state approach to their reliability analysis and the linear programming are applied to the reliability and risk prediction...
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...
Due to blade cracks existing on a worldwide scale and to the lack of system method for hydraulic turbine during their lifetime, it is necessary to develop a system method to evaluation their reliability. This work presents a simple and efficient framework for fatigue reliability assessment of a blade. The paper makes a study on dynamic characteristic, statistical characteristics of stress load, fatigue...
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