13th International Conference on Fracture June 16–21, 2013, Beijing, China Table 2; where hk and hb are the longitudinal dimension, mk and mb are the depth of the external and internal failures (gouges and holes), respectively, furthermore d is the diameter of the artificial holes (holes and through holes). Table 2. The important characteristics of the investigated pipeline sections Mark Details of Pipeline Section Reinforcing Groups of externally reinforced pipeline sections A_e1 111 girth weld, „NOT PASSED” quality – A_e2 111 girth weld, „NOT PASSED” quality CFRPMC B_a1 base (unwelded) pipe – B_a3 141/111 and 111 girth welds, „PASSED” quality – B_a4 111 girth weld, „NOT PASSED” quality – B_b1 base (unwelded) pipe – B_b2 141/111 girth weld, “NOT PASSED” quality – B_b3 114/111 girth weld, “NOT PASSED” quality CFRPMC B_b4 114/111 girth weld, “NOT PASSED” quality CFRPMC B_b5 114/111 girth weld, “NOT PASSED” quality CFRPMC B_b6 artificial longitudinal gouge (hk = 75 mm, mk = 2 mm), circumferential gouge (hk = 85 mm, mk = 4,1 mm and interacting circumferential gouges (hk = 2*75 mm, mk = 3,2 mm) – B_b7 artificial longitudinal gouge (hk = 75 mm, mk = 2 mm), circumferential gouge (hk = 100 mm, mk = 2,9 mm and interacting circumferential gouges (hk = 2*75 mm, mk = 3,2 mm) CFRPMC B_b8 artificial failure: longitudinal gouge (hk = 70 mm, mk = 2 mm) – C_d1 artificial longitudinal gouge (hk = 100 mm, mk = 3 mm), circumferential gouge (hk = 150 mm, mk = 4,7 mm and interacting circumferential gouges (hk = 2*130 mm, mk = 4 mm) – artificial longitudinal gouge (hk = 100 mm, mk = 3 mm) – new artificial longitudinal gouge (hk = 100 mm, mk = 3,1 mm) – C_d2 artificial longitudinal gouge (hk = 100 mm, mk = 3 mm), circumferential gouge (hk = 150 mm, mk = 4,7 mm and interacting circumferential gouges (hk = 2*130 mm, mk = 4 mm) CFRPMC artificial longitudinal gouge (hk = 100 mm, mk = 3 mm) CFRPMC CS_a1 111 girth weld, „NOT PASSED” quality CS CS_b1 111 girth weld, „NOT PASSED” quality – CS_b2 111 girth weld, „NOT PASSED” quality CS CS_b3 111 girth weld, „NOT PASSED” quality CS CS_b4 111 girth weld, „NOT PASSED” quality CS D_c1 seam weld, “NOT PASSED” quality – Group of internally reinforced pipeline sections E_o4 artificial holes (d = 4, 8, 10, 12, 16 and 20 mm, mb = 4 mm) – E_o1 artificial longitudinal gouge (hb = 70 mm, mb = 3,2 mm) GFRPMC E_o2 artificial through holes (d = 4, 8, 10, 12, 16 and 20 mm) GFRPMC E_o3 artificial holes (d = 4, 8, 10, 12, 16 and 20 mm, mb = 4 mm) GFRPMC 3. Results of the full-scale investigations Fig. 1 demonstrates the internal pressure vs. time diagrams of the investigated DN 200 pipeline sections in the B_a and B_bi testing groups (see Table 1 and Table 2) during their burst tests. Fig.1 -4-
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