Computations using creep compliance

After the 100 s period, the creep compliance is computed from the equation given in AASHTO T 322 (2011), using the average values of thickness (mm), diameter (mm) and applied creep load (kPa) for the three replicates. 

Computations have been carried out using the creep compliance function in equation (6), with k = 0.1, for various values of the loading rate parameter A, where... 

The phenomenological language used here is the distribution of retardation times that determines the creep compliance J(t). Various mathematical models are employed to model the observed behavior, but this is still early in the game for this approach. There is still limited good data, and it is well before the more sophisticated computer approaches of the future. 

Two test cases are used to validate the linear viscoelastic analysis capability implemented in the present finite-element program named NOVA. In the first case, the tensile creep strain in a single eight-noded quadrilateral element was computed for both the plane-stress and plane-strain cases using the program NOVA. The results were then compared to the analytical solution for the plane-strain case presented in Reference 49. A uniform uniaxial tensile load of 13.79 MPa was applied on the test specimen. A three-parameter solid model was used to represent the tensile compliance of the adhesive. The Poisson s ratio was assumed to remain constant with time. The following time-dependent functions were used in Reference 49 to represent the tensile compliance for FM-73M at 72 °C ... 

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