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Foundation ::
Crack Growth and Fatigue Analysis ::
CDA
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CDA
Cyclic Damage Accumulation Life Prediction System
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SOURCE CODE AVAILABLE
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CDA (Cyclic Damage Accumulation) performs high temperature, low cycle fatigue life prediction for materials analysis. It was designed to account for the effects on creep-fatigue life of complex loadings such as thermomechanical fatigue, hold periods, waveshapes, mean stresses, multiaxiality, cumulative damage, coatings, and environmental attack. Several features of the model make it practical for application to actual component analysis using modern finite element or boundary element methods. Although it has been developed for use in predicting the crack initiation lifetime of gas turbine engine materials, it can be applied to other materials as well.
The CDA model is based on continuously cycled isothermal fatigue testing and includes many features that make it well suited for use with modern high temperature materials. It uses total strain rather than inelastic strain for the basic life prediction. This is especially important for the design of gas turbine engines, since typical components have small inelastic strains when they are designed for useful lives in the thousands of cycles. Ratios are used with respect to reference conditions, rather than absolute levels for stresses and other calculated quantities. This helps to reduce the sensitivity to the accuracy of the constitutive modeling. CDA was designed to predict crack initiation, not total failure, with the definition of initiation being the development of detectable cracks with size of at least 0.030 in. (0.76 mm) at the location being considered.
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Copyright (c) K.K. Gupta 2010, 2011. All rights reserved.
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