Finite element models design

At present the finite element method is a major one for product strength analysis.

Our specialists worked out special requirements for the finite element model for solution of different tasks. Each created model is tested for these requirements. The tests may be used by the customer after request.

In order to solve the problems by the finite element method it is necessary to prepare the finite element model of the product. The complexity of the model depends on the complexity of the geometrical model and the precision requirements.

To get a qualitative model the automatic tools are not sufficient. To our regret the existing automatic end element grid generators are inadequate. They make it possible to get the shell models with triangular elements (TRIA) or solid tetrahedral models (TETRA). Such models can provide the required precision for simple problems solution only, the range of which is very narrow.

In real tasks with a complex geometry the quadrangular elements(QUAD) or hexahedral elements (HEX) should be used while the presence of the triangular elements is excluded completely or permitted in small numbers.

But the QUAD or HEXA elements can not guarantee high quality of the model. The elements should answer many requirements such as the closeness of the element form to quadrangle, element congruity and the grid regularity. Very often the model geometry is simplified by construction of the finite element grid. The engineer should fully understand the processes taking place in the product to simplify the model. Besides, many companies have their own requirement for the models.