| Citation: | SUN Jie, LI Min, SUN Binet al. Brittle fatigue damage model including initial damage and model verification[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(12): 2416-2421. doi: 10.13700/j.bh.1001-5965.2016.0869(in Chinese)
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Failure caused by fatigue damage is one of the most common failure modes of engineering structures. By using irreversible thermodynamics and microscopic damage mechanics, a new model of brittle fatigue damage based on brittle damage mechanism was proposed. A strict and detailed derivation of the new model including initial damage by using the stress amplitude and the characteristic parameters of damaged material as the dominating variables was given. An experiment on 12Cr1MoV steel was performed as an example. It is shown that the new model including the initial damage variable can be used to estimate the initial damage of the materials; the new model has significant advantages compared with similar fatigue damage models at the beginning of the fatigue process when the damage is very small, and meanwhile the new model can be applied in life prediction of the brittle material fatigue damage; the new model is simple, has small amount of parameters, and is in better agreement with the experimental results than similar models of fatigue damage.
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