Analysis on the Behavior of Nonpropagating Fatigue Cracks under Steep Stress Gradients

Table 2

Comparisons of predicted and tested data for two materials.

Material	𝜌 (mm)	Δ𝜎0 (MPa)	Δ𝐾0 (MPa√m)	𝐷 (mm)	Δ𝜎𝑛 (MPa)	𝑎𝑛𝑝𝑐0 (mm)			𝑎𝑛𝑝𝑐 (mm)	𝑎0	𝐾𝑓	𝐾𝑡
Mild steel [5]	0.25	400	12	10.16	42	0.1	0.2		>0.12	0.23	6.72	13.75
Mild steel [5]	0.25	400	12	10.16	57.8	0.4	0.5	0.6	>0.21; <0.85	0.23	6.72	13.75
Mild steel [5]	0.1	400	12	15	30.9	0.1			>0.1	0.23	8.14	25.5
Mild steel [5]	0.051	400	12	20.32	27.8	0.5	0.6	1.1	>0.1	0.23	9.45	40.9
Mild steel [5]	0.051	400	12	20.32	30.6	0.3	0.4		>0.12	0.23	9.45	40.9
Mild steel [5]	0.051	400	12	20.32	38.9	0.5	0.6		>0.2	0.23	9.45	40.9
Steel [11]	0.16	326	12.22	6	60.7	0.099			>0.018; <0.15	0.36	2.24	13.2
Steel [11]	0.16	326	12.22	6	69.3	0.28			>0.019; <0.15	0.36	2.24	13.2
Steel [11]	0.16	326	12.22	6	86.7	0.5			>0.05; <0.14	0.36	2.24	13.2
Steel [11]	0.16	326	12.22	6	88.4	1.41			>0.05; <0.14	0.36	2.24	13.2
Steel [11]	0.16	274	8.36	6	52	0.039			>0.018; <1.5	0.24	2.0	13.2
Steel [11]	0.16	274	8.36	6	60.7	0.25			>0.017; <0.63	0.24	2.0	13.2
Steel [11]	0.16	244	6.38	6	43.3	0.029			>0.02; <0.8	0.17	1.94	13.2
Steel [11]	0.16	244	6.38	6	52	0.125			>0.03; <1.4	0.17	1.94	13.2
Steel [11]	0.16	244	6.38	6	60	0.37			>0.1; <0.7	0.17	1.94	13.2