Laminated steel with compliant viscoelastic core

摘要

Laminated metallic sheets which comprise an interior layer of a viscoelastic polymeric compound sandwiched between outer layers of metallic sheet may exhibit enhanced properties through modification of the viscoelastic phase. In a first embodiment the elastic modulus of the viscoelastic polymeric compound may be reduced by incorporating voids, bubbles or pores within the compound. These voids which may be introduced by introduction of polymeric microspheres are effective in reducing the internal stresses induced in the laminate by temperature changes. In a second embodiment, coating the microspheres with an electrically-conductive layer may be effective in enabling resistance spot welding of such laminated materials.