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Showing 1 to 10 of 10 for “"User Material Subroutine"”.
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Structural Behavior of Nitinol Microflaps
… DMA specimens were created by incorporating a user material subroutine SMA-UMAT in ABAQUS. Model results were verified by correlation with the DMA experimental results. The structural behavior of a SMAT microflap was then analyzed and the results were correlated with experimental observations …
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Creep predictions for turbomachinery components
… during tensile creep testing. The creep-damage material model is extended to multidimensional situations. A refinement, whereby no damage accumulates in compression, is incorporated. A User-Material subroutine for this constitutive model has been formulated, and incorporated into the ABAQUS FEM …
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A yield function to simulate earing in the deep drawing of aluminium
… is caused by plastic anisotropy of the blank material and anisotropy induced during the drawing process. It is the result of crystallographic textures or preferred grain orientations that develop during the sheet rolling process. In polycrystalline materials it may be modelled via either …
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Constitutive modeling of the thermo-mechanics associated with crystallizable shape memory polymers
This research addresses issues central to material modeling and process simulations. Here, issues related for developing constitutive model for crystallizable shape memory polymers are addressed in details. Shape memory polymers are novel material that can be easily formed into complex shapes, …
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A new constitutive model for the finite element analysis of metal powder compaction
… constitutive theories based on elastic-plastic material models. Most of the work has concentrated on the use of quadratic yield surfaces but experimentation has shown that this type of yield surface does not always correctly represent metal powder behaviour (Brown, 1994 ). This thesis details …
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Three-Dimensional Finite Element Analysis of Flexible Pavements Considering Nonlinear Pavement Foundation Behavior
… deformation behavior of pavement foundation geomaterials, i.e., fine-grained subgrade soils and unbound aggregates used in untreated base/subbase layers, due to repeated wheel loading. This nonlinear behavior is commonly characterized by stress dependent resilient modulus material models that …
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Development and validation of thermo-mechanically coupled finite elements for the simulation of the nonlinear time response of multi-layered shape memory alloy beams
… elements of ABAQUS commercial software through a user material subroutine (UMAT). In the second part of the dissertation, beam FEs are developed that incorporate the developed SMA constitutive model and provide significant computational advantages compared to the continuum FEs. The new FEs …
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Constitutive modeling of glassy memory polymers
… is to develop constitutive models for non-linear materials. Here, issues related for developing constitutive model for glassy shape memory polymers are addressed in detail. Shape memory polymers are novel material that can be easily formed into complex shapes, retaining memory of their original …
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Experimental and Numerical Analysis of Damage in Notched Composites
… to implement the damage evolution model via a user-defined material subroutine. Damage initiation has been assessed using Hashin's failure criteria and the Matzenmiller model was adopted for damage evolution. A second finite element model was developed using Abaqus and Autodesk Simulation …
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Studying the Effects of Thermo-oxidative Aging on the Mechanical, Tribological and Chemical Properties of Styrene-butadiene Rubber
… quantify the effects of aging. In this study, a material aging model that can predict the hyperplastic response of styrene-butadiene rubber (SBR) was mathematically developed using an integrated testing and continuum damage model framework. Coupling between the mechanical changes of SBR to the …