The battery of a passenger car is vibrating due to the road excitation. Because of the mass of the battery these vibrations lead to high structural loads within the supporting structure. Thus a correct dynamic model including the nonlinear contact interactions at the spot welded flanges becomes necessary for a reliable durability analysis.
In the example model of a battery bracket the contact interactions within the spot welded flanges of the battery bracket and the surrounding area was included with MAMBA. In the linear model the loads are only transferred via the spot models leading to unrealistic high damage values in several locations. The supporting effect of contacts results in a different load path which leads to reduced damage values in several spot welds and increased damage values in some spot welds.