ANSYS Mechanical comes with many different licenses to choose from, and choosing the right one can be difficult. Therefore, a description of the most common licenses comes here:
ANSYS Professional NLS
NLS means Non Linear Structural, and this license gives you access to much of ANSYS non linear capabilities. This includes non-linear contact with constant friction, bilinear plasticity and large deflection (non linear geometry). You can also do steady state thermal analysis with this license, and use the results as loads in structural analysis.
ANSYS Professional NLT
NLT means Non Linear Thermal, and the license gives access to Steady State and Transient thermal analysis. You can also perform structural analysis with limited access to non-linear capabilities. Transient thermal analysis means that you can analyse temperatures over time, so that heating and cooling of structures can be analysed. The analysis is carried out over several time steps, and each step can be linked to a structural analysis.
ANSYS Structural
This license gives access to all ANSYS linear and non linear structural capabilities. That means more advanced material models, elements and frictional models, in addition to completely non-linear transient analyses.
Advanced frictional models include orthotropic friction, meaning that the frictional coefficient depends on the direction. This capability is used for analysis of pipe lines. You can also model friction that depends on contact pressure, temperature and sliding distance.
Advanced material models include multilinear plasticity, hyperelasticity and creep. Multilinear plasticity lets you model the plastic behavior of metals more accurately, so that you can get more accurate results and be less conservative in non linear buckling analyses. Hyperelasticity is needed to model large strains in polymers like rubber, while creep is needed to model behavior over time for metals used in high temperatures and stresses.
Debonding is a contact analysis type that lets you simulate surfaces that are initially bonded, but that will break apart if the forces get high enough. That can for example be surfaces that are glued together.
Element birth/death means that elements can be taken in and out of an analysis. That can for example be used to model a welding process, where elements are added to represent the weld.
Advanced elements include non linear springs, springs with damping, gasket elements, some types of fluid elements and concrete elements.
Modal analysis with damping from water is one type of analysis you can carry out with the fluid elements (note that this is not fluid elements like in a CFD program, but elements that lets you simulate some effects that a fluid can have on a structure).
Concrete elements simulate the special behavior of concrete, like cracking and crushing with different strength in tension and compression. You can also add rebars in three directions.
Transient analysis lets you study the behavior of structures over time. You can use this for dropped object analyses, low velocity impact analyses, earthquake and other types of analyses where loads and boundary conditions may change with time.
ANSYS Mechanical
ANSYS Mechanical gives you full access to all ANSYS’ capabilities for structural and thermal analysis, as well as acoustic analysis. Everything you have and in Professional and Structural, and more, you will find in Mechanical.
Coupled field is the big thing with this license. The different analysis types can be coupled together, to see the effect one has on the other. One example is thermal-structural, were thermal strains lead to structural changes (e.g. contact) which again changes the thermal properties. To model that you need to take results from a thermal analysis and map them on to the structural model. The results from the structural analysis must then be used to change the thermal model. This process will have to be repeated several times, step by step. To do this in a practical way, you need special elements with a strong coupling between thermal and structural. Mechanical has that.
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