Title: Study on Fatigue Performance of Automotive High-strength DP800 Steel
Abstract: A series of high cycle fatigue experiments of domestic DP800 steel plate with thickness of 1.5 mm were carried out. The fatigue test data were fit and the microstructure of the steel's scanning fatigue fracture was analyzed.The results show that: under the conditions of the loading frequency for 8 Hz and R=0, the fatigue limit of DP800 steel plate is 490 MPa. The fatigue strength is 0.6125 times higher than the tensile strength, that is σ0=0.6125σb; the fitted experience formula obtained by S-N curve is that: when σmax≥510MPa, it is N=±(739252.7448-1172.3673σmax); when σ0≤σmax≤510 MPa, it is N=±(16170275.66-31471.976σmax); there are the obvious fatigue banding in the fatigue fracture, the fatigue crack growth area is ductile fracture and the transient breaking area is brittle fracture.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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Cited By Count: 1
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