Symbol 
Object Type 
Size 
Units 
Meaning 

6 x 1 

stress components (e.g. s_{1}) 

6 x 1 

strain components (e.g. e_{3}) 

3 x 1 

electric field components 

3 x 1 

electric charge density displacement components 

6 x 6 

compliance coefficients 

6 x 6 

stiffness coefficients 

3 x 3 

electric permittivity 

3 x 6 

piezoelectric coupling coefficients for StrainCharge form 

3 x 6 

piezoelectric coupling coefficients for StressCharge form 

3 x 6 

piezoelectric coupling coefficients for StrainVoltage form 

3 x 6 

piezoelectric coupling coefficients for StressVoltage form 