Fatigue surface crack growth in cylindrical specimen under combined loading
作者： R. Citarella , M. Lepore , V. Shlyannikov , R. Yarullin
DOI: 10.1016/J.ENGFRACMECH.2014.08.017
关键词: Composite material 、 Compact tension specimen 、 Crack closure 、 Stress intensity factor 、 Crack growth resistance curve 、 Paris' law 、 Structural engineering 、 Stress concentration 、 Crack tip opening displacement 、 Materials science 、 Steel bar
摘要: Abstract The subject for studies is a steel bar of circular cross-section with straight-fronted edge notch undergoing fatigue loads. Both the optical microscope measurements and crack opening displacement (COD) method are used to monitor investigate both depth length during tests. variation growth behavior studied under cyclic axial combined tension + torsion loading. Results show that Mode III loading superimposed on I leads life reduction. In parallel experimental activity, numerical calculations performed based three-dimensional DBEM analysis determine stress intensity factors along curvilinear surface front prediction. results obtained from round specimens have been compared predictions. computational found be in satisfactory agreement findings.
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