In a constrained layer damping system, sometimes referred to as CLD, a damping material is sandwiched between two other materials (usually stiff/center of the “sandwich” is sheared rigid). For example, Green Glue Compound sandwiched between two layers of drywall. Damping occurs when the viscoelastic center of the “sandwich” is sheared (see image above).
When bent, shear forces pull and stretch on the damping material. Under these conditions, the unique polymeric construction of Green Glue Compound very efficiently converts this mechanical energy to heat. The vibration energy is not isolated, it’s dissipated and gone.