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Hoffman 3,c 1 School of Materials Science and Engineering, University of New South Wales Sydney, NSW 2052, Australia 2 Iplex Pipelines Australia Ltd, Chipping Norton, NSW a z3145562@student.unsw.edu.au, balan.whittle@iplexpipelines.com.au, c mark.hoffman@unsw.edu.au Keywords: Fatigue threshold, PVC-U, PVC-M, air, water, fibrillar structure, nodules structure Abstract: The cyclic fatigue threshold value (∆Kth) of PVC materials with (PVC-M) and without (PVC-U) impact modifier was determined and compared in air and water environments.
(a) (b) Fig. 1: The fatigue crack growth rate of PVC-U at (a) 1 Hz and (b) 7Hz in air and water (a) (b) Fig.2: The fatigue crack growth rate of PVC-M at (a) 1 Hz and (b) 7Hz in air and water Fig. 3: The fatigue crack growth rate of PVC-U and PVC-M at 20 Hz in air Table 1: The fatigue threshold values of PVC-U and PVC-M in water and air medium Fatigue Threshold [MPa.m 1/2] Author Material Specimen Form R-ratio [R=Kmin/Kmax] Frequency [Hz] air water 1 0.19 0.22 7 0.22 0.24 Present Work PVC-M CT 0.1 20 0.24 - 1 0.22 0.23 7 0.24 0.23 Present Work PVC-U CT 0.1 20 0.24 - 0 - 0.5 5 0.25-0.15 [1] PVC-U SEN ≥0.5 5 0.15 - [3] PVC-U SEN 0.1 and 0.5 5 0.21 0.15 (a) (b) Fig. 4: FESEM micrographs of (a)PVC-U and (b)PVC-M at ∆K < 0.26 MPa.m1/2 in air at 7Hz (a) (b) Fig. 5: FESEM micrographs of (a)PVC-U and (b)PVC-M at ∆K < 0.26 MPa.m1/2 in water at 7Hz
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