These tests verify that temperature and field variable values are properly transferred to a structure when various combinations of *TEMPERATURE and *FIELD are used. The structure being analyzed is a cantilevered truss made up of 10 T3D2 elements.

Three different transient heat transfer runs are used to generate three results files containing temperature histories. These files will be read into subsequent stress analyses as either temperature or field variable data. All of the runs begin with the entire truss at some initial temperature; the temperature throughout the truss is then ramped to some new temperature.

The three heat transfer runs are as follows:

The subsequent stress analysis runs are as follows:

These tests verify the use of *TEMPERATURE and *FIELD in conjunction with composite structural shells. Both temperature and field variable results are generated from a single previously run heat transfer shell analysis. The same analysis can be used for generation of field variable results, since field variables are stored identically to temperatures in an ABAQUS results file.

The heat transfer problem involves a three-layer composite shell that is subjected to prescribed thermal boundary conditions on its top and bottom surfaces. A steady-state analysis is performed to obtain the temperature distribution through the thickness of the composite layers. Three temperature points are used for each layer. The temperature distribution obtained is compared to the exact solution.

In two subsequent runs the temperature results are fed into a similar structural model using the *TEMPERATURE and *FIELD options. Five section points per layer are chosen for the structural model. The temperatures and field variables are assigned to these five points through a linear interpolation of the three values available per layer from the preceding heat transfer analysis. The results of these analyses verify that the temperatures and field variables are assigned properly.

This sequence of runs is tested for shells with 3, 4, 6, and 8 nodes.

These tests verify the interpolation of temperatures to the midside nodes of higher-order elements in a sequential thermal-stress analysis, when the heat transfer analysis is performed using first-order elements and the stress analysis is carried out using second-order elements.

The results of the heat transfer analyses are read into the stress analyses using the *TEMPERATURE, MIDSIDE, FILE= option. Similarly, the initial conditions applied to the heat transfer analysis are read into the stress analyses using the *INITIAL CONDITIONS, TYPE=TEMPERATURE, MIDSIDE, FILE= option. The MIDSIDE parameter in both the options indicates that the temperatures at the midside nodes must be interpolated from the corner nodes of the element. Temperature interpolation is carried out on an edgewise basis for each element. Thus, the temperature at the midside node of an element is interpolated linearly from the temperatures at the corresponding corner nodes.

The midside node temperature interpolation is tested for one-dimensional, two-dimensional, and three-dimensional elements.

Only one element is used in the finite element models for both heat transfer analysis and stress analysis. Arbitrary material properties are assumed.

These tests verify the interpolation of temperatures between dissimilar meshes. This capability is available only for use with the output database file. The INTERPOLATE parameter must be used on the *INITIAL CONDITIONS, TYPE=TEMPERATURE, FILE= or the *TEMPERATURE, FILE= option. For the cases where the only dissimilarity is an element order, the MIDSIDE parameter should be used. However, for the purpose of verification we reused some of the models created for the midside cases.

The results of the heat transfer (or coupled temperature-displacement) analyses are read into the stress analyses. The INTERPOLATE parameter on the *INITIAL CONDITIONS, TYPE=TEMPERATURE and the *TEMPERATURE options indicates that the temperatures must be interpolated from the nodes of the element in the heat transfer models to the nodes of the current stress analysis models.

The interpolation technique is tested for two-dimensional and three-dimensional elements.

These tests verify that temperatures and pressures are applied properly to a structure when various combinations of *TEMPERATURE and *PRESSURE STRESS are used in a *MASS DIFFUSION analysis. Temperature and pressure stress initial conditions are read from the results file of an ABAQUS/Standard analysis, and a series of pressure and temperature loadings are applied to the nodes of an element using data line input in the following sequence:

The material properties of the problem are defined such that

The following must be confirmed by this test:

These tests verify that the solution-dependent variables from a heat transfer analysis are properly transferred as field variables in the subsequent stress analysis. The structure being analyzed is a cantilevered truss made up of 10 one-dimensional link elements. Output variable SDV is written to the results file using the *EL FILE, POSITION=AVERAGED AT NODES option. A separate results file is then generated, where the SDV value is stored as the second attribute under record key 201.

The temperature and field variable values are set by reading the data from the results file of the heat transfer run as follows:

xsdvttrt.fil Temperature

xsdvttrt1.fil Field variable