A Method to Improve the Finite Element Representation of Joints in Hybrid Models of Vehicle Structures

An overview of some traditional and common techniques used in representing body and frame joints in finite element models will be presented. A historical review will be given on the evolution of different joint representation techniques. There are mainly two categories of joint representations, matrix form and non-matrix form, but there are many variations. Advantages and disadvantages of each technique from the two categories will be discussed. The purpose of parametric models will be reviewed and ways to improve its effectiveness in influencing the design during the early concept stage will be discussed.

An improved joint representation technique will be outlined which uses static condensation to a matrix with improved beam/shell element interface. The use of this matrix to arrive at a correction matrix is proposed that can be added to any joint representation that the analyst prefers. This is a hybrid approach because it uses a non-matrix representation with a correction matrix. The advantages of such an approach will be discussed.