Thermo-mechanical and superimposed high-cycle fatigue interactions in compacted graphite iron
نویسندگان
چکیده
The e ect of adding a superimposed high-frequent strain load, denoted as a high-cycle fatigue strain component, upon a strain-controlled thermomechanical fatigue test has been studied on a compacted graphite iron ENGJV-400 for di erent thermo-mechanical fatigue cycles and high-cycle fatigue strain ranges. It is demonstrated that the successive application of an high-cycle fatigue load has a consistent e ect on the fatigue life, namely the existence of a constant high-cycle fatigue strain range threshold below which the fatigue life is una ected but severely reduced when above. This e ect on the fatigue life is predicted assuming that microstructurally small cracks are propagated and accelerated according to a Paris law incorporating an experimentally estimated crack opening level.
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تاریخ انتشار 2016