几种钢焊接接头低周腐蚀疲劳da／dN方程
Low-cycle corrosion fatigue crack growth rate equations of welded joints for several steels
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摘要: 通过A537、A131,E36和15MnNi几种钢焊接接头进行在海水和空气中的疲劳试验。在双对数logda/dN,logΔK和logda/dN,logΔJ坐标图上,用一条或两条直线二拟合试验数据,因而得到da/dN=C(ΔK)m和da/dN=A(ΔJ)n (或da/dN=B(ΔJe)β;da/dN=D(ΔJp)γ)拟合方程式。用F检验和其他方法去评价拟合曲线,表明该统计结果的拟合是比较精确的,所得上述方程在工程应用是合理的和可行的。Abstract: As to the welded joints made of A537、A131、E36、15MnNi and other steels the fatigue testing has been executed in sea water and atmosphere. By using with the double-logarithmic coordinate system of log da/dN and log ΔK or log da/dN and log ΔJ the experimental data have been fitted with a straight line or two lines, thus the fitting equations da/dN=C(ΔK)m and da/dN=A(ΔJ)n(or da/dN=B(ΔJe)β and da/dN=D(ΔJp)γ)have been obtained. Having evaluated the fit curve by the F test and the others, the statistical results show that the fitting is relatively accurdte, so these equations are feasible and predical.
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Keywords:
- crack growth rate /
- welded joint /
- low-cycle corrosion fatigue
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