By Peter Fritz, Xiong Zheng
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Extra info for A Finite Element Framework for Geotechnical Applications Based on Object-orientated Programming
The class ConstitutiveLaw and its derived classes are used to describe the physical relationship of more complex material behavior than can be expressed with the basic properties. ConstitutiveLaw is derived from FieldVar. It is therefore also a kind of architectural class for the physical field. Like other FieldVar classes, ConstitutiveLaw has its associated FieldVar classes and can be accessed by other FieldVar objects through its field variable type ID. A set of basic interfaces to other objects of the FE modeling subsystem, such as D and C matrices, have been prototyped which are considered to be common to all material models.
Instead FemTaskCmd object uses the appropriate FemResource objects in the resource database of the project. It sends them a message through the virtual Page 38 IMAGINE – an FE Framework function "Execute" which in turn will call a virtual function, in case of CmdSteeringLoad, "Apply" or "Release" to modify a FemStruct object. One of the exceptions of this rule is CmdCompute, for which no corresponding computing resource concept exists. In this case the virtual function "Execute" of CmdCompute simply makes a callback to the virtual function "Compute" of the host FemTask object to execute the task.
Such a feature would especially be useful in the field of geotechnical engineering. This can be verified immediately by viewing the list of demanding research topics in geotechnical engineering: stress analysis problems, groundwater flow problems, swelling problems and convection problems, which require taking into account the coupling of deformational, hydraulic and thermodynamic problems. The design of an FE framework with configurable field variable types requires a complete review of the original theory of FEM.