Material characteristics that a foamed filler material (s) to be filled in a frame cross section (fr) should have are discussed. By using a material complying with the characteristics, the energy absorbability of the frame (fr) is effectively enhanced. In a frame structure (fr) for vehicle bodies in...http://www.google.es/patents/US6296299?utm_source=gb-gplus-sharePatente US6296299 - Frame structure for vehicle body
