Mathematical Problems in Engineering Joint Structure Stiffness Analysis of an Automotive Body in White with the Finite Element Method

The finite element model of the seven connection heads an automotive body in white is established, and stiffness calculation carried out by taking lower joint B pillar as example. Nine values were obtained for each branch, which can be written a 3 × symmetric matrix. front back bending stiffness, torsional internal external are with decoupling method. Based on this, unrigid rigid joints three ratio coefficients branch calculated evaluated. Finally, effects thickness sheet metal parts condition, torsion first-order bending, frequency discussed using regional sensitivity analysis strain energy calculation.