Abaqus FEA model

In particular, the LS-Dyna finite viscoelastic relationship [175] takes into accotmt rate effects through linear viscoelasticity by a convolution integral. The model corresponds to a Maxwell fluid consisting of dampers and springs in series. The Abaqus FEA model is reminiscent of, and similar to, a well-established model of finite viscoelasticity, namely the Pipkin-Rogers model [161]. This model, with an appropriate choice of the constitutive parameters, reduces to the Fung (QLV) model [173, 177]. 

A numerical comparison between the QLV and the Abaqus FEA model for the simple shear and uniaxial extension case has been performed to further highlight the differences between the two models. 

Ciambella J, Destrade M, Ogden RW (2009) On the ABAQUS FEA model of finite viscoelasticity. Rubber Chem Technol 82 184-193... 

With this aim we introduce the ABAQUS FEA finite viscoelasticity constitutive relation 1 and we investigate the resulting material behavior by means of two prototype experiments. Section 4.8.2 of the ABAQUS Theory Manual [173] gives the constitutive relation for modeling nonlinear viscoelastic effects in the form ... 

The NRPCT determined Finite Element Analysis (FEA) models using ABAQUS 6.5-3, would help increase the familiarity with the behavior of the three Primary Support Structure configurations. 

The commercial finite element program, Abaqus [17], was used to calculate the stress distribution in an edge delamination sample. A fully three-dimensional model of the combinatorial edge delamination specimen was constructed for the finite element analyses (FEA). For clarity, some of the FEA results and schematics are presented as two-dimensional configurations in this paper (e.g.. Fig. 1). The film and substrate were assumed to be linearly elastic. The ratio of the film stiffness to the substrate stiffness was assumed to be 1/100 to reflect the relative rigidity of the substrate. This ratio also represents a typical organic... 

Hbaieb et al. [24] compared the utility of modeling polymer-montmorillonite nanocomposites by finite element analysis (TEA) in relation to the Mori-Tanaka model. The three-dimensional finite element model (FEM) was found to be superior to the two-dimensional one. For the calculations, the aspect ratio (A) was chosen to be 50, YfjYp = 100, the Poisson ratio for the polymer (Pp) was assumed to be 0.35, and the Poisson ratio for the montmorillonite was assumed to be Pf = 0.2. The FEA was performed using the commercial package, ABAQUS. The morphology of the montmorillonite was assumed to be disk-shaped. The limitations of this assumption are exposed in the discussion above by Lee and Paul. 

ABAQUS is the Naval Reactors program standard FEA code it was verified with a suite of problems at the time of installation. Several simple models were created and tested for comparison to hand calculations for qualification. In addition, the class of problems analyzed is similar to the dynamic models used in the Naval Reactors program. 

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