THREE-DIMENSIONAL FEM ANALYSIS OF STRESS-INTENSITY FACTOR IN PETROLEUM DRILL PIPE JOINT WITH SURFACE CRACK Ⅱ.SEMI-ELLIPTICAL SURFACE CRACK AT THE ROOT OF NUT SCREW
Zhao Hua, Li Zhonghua, Kuang Zhenbang, Zhang Yi, Li Helin
Editorial office of ACTA PETROLEI SINICA . 1992, (S1): 191 -202 .  DOI: 10.7623/syxb1992S1024

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