Time-dependent probability analysis pipes

Time-dependent probability analysis of fiber-reinforced polymer rehabilitated pipes... 

The probabilistic analysis presented in this chapter is not restricted to a specific fabrication approach but rather presents results as a function of the fiber volume fraction and can be applied to a wide range of pipe rehabilitation methods. The time-dependent failure probability analysis is illustrated for specific fiber volume fractions and can be repeated for any fiber volume fraction depending on the manufacturing process of interest. Typical fiber volume fractions of 30% and 40% are selected conservatively for example probability analysis conducted in the chapter. Recent efforts to measure fiber volume fractions used in composite pipe applications report fiber volume fraction values ranging from 47.6% to 54% for filament-wound composite pipes (Abdalla et al., 2008), and Chin and Lee (2005) measured volume fractions of 47% for unidirectional laminates manufactured via resin transfer molding in a trenchless rehabilitation scheme. 

The result of the deterministic-probabilistic structural integrity analysis is the estimates q, i = 1,. .., 8, of pipe rupture (failure) probability with in case of different defected zone thickness b = 0.1, 0.5, 1, 2, 3, 4, 5, 6, mm (presented in Fig. 3). Rupture probability (per year) dependence on piping operating time t was calculated using corrosion rate r = 0.2 mm/year, conservatively (the worst case) q, b => q, /= ,...,8. 

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