La possibilitià di realizzare simulazioni ad elementi finiti con gli opprotuni modelli di materiale che correttamente descrivano il comportamento stress-strain dei propri materiali è una funzionalità chiave per poter simulare correttamente fenomeni e/o maeriali particolari quali non-linearità o elastomeri. midasNFX offre una estesa libreria di modelli di materiali e di materiali attraverso i quali è possibile simulare quasi la totalità dei fenomeni meccanici.
Midas NFX provides a database of more than 1000 linear material models, which helps to simulate behavior of almost any kind of material.
Based on the characteristics, materials can be further divided in to linear, elasto-plastic, hyper-elastic, nonlinear-elastic and temperature dependent materials.
Based on directional behavior, materials can be defined as isotropic, orthotropic, anistotropic materials.
Composites materials are supported too both for 2D and 3D elements.
The elasto-plastic material is used when stress is between the elastic limit of a material and its yield strength. And the material exhibits both elastic and plastic properties.
midas NFX support elasto-plastic material model via stress-strain curve, plastic hardening curve and perfect plastic curve.
Nonlinear-elastic material model can simulate the nonlinear but elastic behavior of some materials.
The nonlinear stress-strain relationship is given by a multi-linear curve that is defined by a set of points (s-e curve)
midas NFX support different types of Hyper-elastic models to simulate rubbers. Mooney-Rivlin, Ogden, Blatz-Ko, and more are the material models implemented.
Both models parameters input and direct input of test data are supported. A tool for interpolation of material model coefficients is available, working on single tensile test and/or on full test set of experimental data. The tool allows also material model evaluation and identification of model stability limits.
midas NFX support material models depending on temperature through the input of different material curves.
Temperature dependent materials are useful to investigate applications where material properties are highly dependent on working temperature (i.e. pressure vessels, plastics, …)
Composites materials are supported both for 2D and 3D elements.
Composite lamina is defined by orthotropic 2D or 3D formulation and while the laminate is defined with an intuitive lay-up tool that applied to both 2D laminate and 3D laminate elements. Laminate element stiffness properties are evaluated by the Classical Lamination Theory (CLT).
Strength is evaluated according to most common failure theories (LaRC, Tsai-Hill, Tsai-Wu, …)