Investigation of Stress Concentration and Casing Strength Degradation Caused by Corrosion Pits

Table 1

Results of photoelastic experiment.

Category	Center distance ratio	Outer edges			Pits bottom			Junction
				Average			Average
Single pit	0	1.22	1.20	1.21			1.93		1.93
Double pits	1.0	1.72	1.65	1.68	2.26	2.26	2.26	2.40	2.40
	1.5	1.75	1.72	1.74	2.42	2.37	2.40	2.83	2.83
	2.0	1.55	1.52	1.54	2.22	2.23	2.23	2.79	2.79
	3.0	1.50	1.45	1.48	2.05	2.12	2.09	1.30	2.09