## How to define thermal expansion in Abaqus?

Thermal expansion

- can be defined by specifying thermal expansion coefficients so that Abaqus can compute thermal strains;
- can be isotropic, orthotropic, or fully anisotropic;
- are defined as total expansion from a reference temperature;
- can be specified as a function of temperature and/or field variables;

**Can Abaqus do thermal analysis?**

Abaqus allows for dissimilar meshes between the heat transfer analysis model and the thermal-stress analysis model. Temperature values will be interpolated based on element interpolators evaluated at nodes of the thermal-stress model. Fully coupled thermal-stress analysis in Abaqus/Explicit is always transient.

**What is expansion in Abaqus?**

Specify thermal or field expansion. This option is used to define thermal expansion or field expansion in Abaqus/Standard for a material or for the behavior of a gasket.

### Is thermal expansion isotropic?

The volumetric thermal expansion coefficient is the most basic thermal expansion coefficient. illustrates that, in general, substances expand or contract when their temperature changes, with expansion or contraction occurring in all directions. Such substances that expand in all directions are called isotropic.

**How is heat flux defined in Abaqus?**

Defining a surface heat flux

- Select Uniform to define a load that is uniform over the surface.
- Select User-defined to define the magnitude of the load in user subroutine DFLUX.
- Select Total Flux to define a load that is uniform over the surface.

**What is coupled thermal analysis?**

A coupled thermal-electrical-structural procedure is used to solve simultaneously for the stress/displacement, the electrical potential, and the temperature fields. A coupled analysis is used when the thermal, electrical, and mechanical solutions affect each other strongly.

## How do you define thermal expansion in Abaqus/Standard?

In an Abaqus/Standard analysis spatially varying isotropic, orthotropic, or anisotropic expansion can be defined using a distribution. When using a distribution, the TYPE parameter must be used to indicate the level of anisotropy of thermal expansion.

**What determines the number of expansion coefficients in an Abaqus/Standard analysis?**

In an Abaqus/Standard analysis if a distribution is used to define the thermal expansion, the number of expansion coefficients given for each element in the distribution, which is determined by the associated distribution table ( Distribution definition ), must be consistent with the level of anisotropy specified for the expansion behavior.

**How to solve thermal-stress problems in Abaqus?**

For such cases the thermal and mechanical solutions must be obtained simultaneously rather than sequentially. Coupled temperature-displacement elements are provided for this purpose in both Abaqus/Standard and Abaqus/Explicit ; however, each program uses different algorithms to solve coupled thermal-stress problems.

### What types of temperature-displacement elements are available in Abaqus?

Coupled temperature-displacement elements that have both displacements and temperatures as nodal variables are available in both Abaqus/Standard and Abaqus/Explicit (see Choosing the appropriate element for an analysis type ).

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