The materials,which have the nature to couple the mechanical properties with the electric , mag-netic and thermic properties,are important components in smart system or structure.

• 具有电磁热弹性耦合性质的介质是许多传感器及机敏结构或系统中的关键材料，本文第一部分动态变分原理已就具有这种性质的机敏材料动力学理论作了较为系统的分析。