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Finite Element Simulation Of Creep Buckling Of Cipp Liners Under External Pressure, Qiang Zhao
Finite Element Simulation Of Creep Buckling Of Cipp Liners Under External Pressure, Qiang Zhao
Doctoral Dissertations
The problem of long-term structural behavior of CIPP liners under external hydrostatic pressure has been characterized as a structural instability problem which is induced by time-dependent material deformation or creep. It is also a contact problem since the liner deflection is externally constrained by the host pipe. The intrinsically nonlinear problem is investigated by means of finite element simulation, with emphases on (a) the essential structural behaviors and mechanisms of buckling, and (b) the influences of inelastic material properties (i.e. yield strengths and creep rates) and geometrical parameters on liner's buckling resistance.
A liner first deforms as a free pipe …