Based on the axial displacement of the top of the viscoelastic layer ucv, one can further derive the equivalent stiffness of the viscoelastic and the active constraining layer as:

	(38.6)

Where, ‘b’ is the width of the beam, ‘t_c’ the thickness of the constraining layer, ‘l_a’ the length of the active patch. The variation of the stiffness in the viscoelastic and active constraining layer with respect to the non-dimensional thickness parameter is shown in Fig. 38.3.

Figure 38.3: Variation in stiffness of VEM with thickness of cover layer

The stiffness of the viscoelastic layer varies quite non-linearly with respect to the thickness of the constraining layer, while the stiffness of the constraining layer varies linearly with ‘t_c'.

Congratulations! You have finished Lecture 38.