A rapid evaluation method for low-cycle fatigue performance of ultra-thin automotive steel plates
A low-cycle fatigue, automotive steel plate technology, applied in the direction of strength characteristics, instruments, and the use of repetitive force/pulse force to test the strength of materials, etc., can solve the problems of the accuracy of the test results, the increase of material consumption, etc., to achieve a simple test process. Fast and cost-effective experimental material
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Embodiment 1
[0090] Carry out cantilever beam symmetrical bending fatigue loading on a DP590 steel sheet with an original thickness of 2 mm, determine the thickness range of the cantilever beam bending fatigue loading sample according to step S1, and design the thin foil size according to step S11: 1:11mm, l 0 : 3mm, w: 3.5mm, measure the average grain size of ferrite as d=9.5μm; calculate the number of grains passing through the first stage of fatigue crack propagation by step S12, Y≈1, σ y '≈400MPa, Δσ value is about 400~450MPa, calculated as i=3~4; from step S13, if the plate is subjected to tension-compression symmetric fatigue loading, calculate the number of grains that the crack propagates through in the second stage j≈2000 / 9.5≈210; combined with steps S14, S15 and S16, the value range of m is 2.5-4, and the calculated thickness range of the thin foil sample is t=60-160 μm. Then proceed to step S2, from step S21, select the thin foil thickness as 50 μm, 100 μm, 150 μm, 200 μm; est...
Embodiment 2
[0092] Carry out cantilever beam symmetrical bending fatigue loading on a DP steel sheet for automobiles with an original thickness of 2mm and a martensite volume fraction of 14%, determine the thickness range of the cantilever beam bending fatigue loading sample according to step S1, and design according to step S11 Thin foil size: l: 11mm, l 0 : 3mm, w: 3.5mm, measure the average grain size of ferrite as d=9.5μm; calculate the number of grains passing through the first stage of fatigue crack propagation by step S12, Y≈1, σ y '≈400MPa, Δσ value is about 400~450MPa, calculated as i=3~4; from step S13, if the plate is subjected to tension-compression symmetric fatigue loading, calculate the number of grains that the crack propagates through in the second stage j≈2000 / 9.5≈210; combined with steps S14, S15 and S16, the value range of m is 2.5-4, and the calculated thickness range of the thin foil sample is t=60-160 μm. Then proceed to step S2, from step S21, select thin foil th...
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