Numerical Analysis of the Stress Distribution and Concentration Factors of the Tool Joint of the Directional Drill Pipe

Table 3

Orthogonal analysis results.

Serial number	Ta	Th (Degree)	Maximum stress (MPa)	k
1	1 : 22	24	581.30	1.56
2	1 : 22	29	581.62	1.57
3	1 : 22	34	580.15	1.48
4	1 : 25	24	582.08	1.58
5	1 : 25	29	581.63	1.47
6	1 : 25	34	580.91	1.56
7	1 : 30	24	581.81	1.61
8	1 : 30	29	580.72	1.50
9	1 : 30	34	574.71	1.55