The structure of busbar is 20-30 layers 0.1-0.2mm cupper that no glue or any connection between each layer, only welding at two ends of busbar. Should I just model them as many layers Shell elements, or any other smarter method to model this kind of structure. This is for modal(frequency)calculation and random response(vibration)calculation. 

Abaqus ​​​​​​​