Active and Passive Vibration Damping

Appendix AComplex Modulus of Typical Damping Treatments

This appendix presents a brief summary of the effect of operating temperature and frequency on the complex modulus of three of the most commonly used viscoelastic materials (VEM). These VEMs are manufactured by 3M (Bonding Systems Division, 3M Center, Building 220‐7E‐01, St. Paul, MN 55144‐1000), E.A.R. (Aearo E.A.R. Specialty Composites, 7911 Zionsville Road Indianapolis, IN 46268), and Soundcoat (Soundcoat, 1 Burt Drive, Deer Park, NY 11729).

A.1 3M^TM Viscoelastic Damping Polymers

The main characteristics of the ISD series (110,112, 113) of 3M VEM are summarized in Table A.1 and Figures A.1–A.3.

Table A.1 Operating temperature range, maximum loss factor, and corresponding storage modulus of 3M VEM (ISD 110, 112, 113).

Polymera,b,c	Operating temperature range (°C)	Maximum loss factor η max at temperature (°C)	Storage shear modulus G ′ at η max (MPa)
ISD 110	40 to 105 (high)	1.2 at 55	0.12
ISD 112	−20 to 65 (normal)	1.1 at 30	0.15
ISD 113	−40 to 20 (low)	1.2 at −20	0.40

^a 3M, Bonding Systems Division, 3M Center, Building 220‐7E‐01, St. Paul, MN 55144‐1000.

^b Poisson's ratio for 110, 112, and 113 viscoelastic damping polymers: approximately 0.49.

^c Density for 110, 112, and 113 viscoelastic damping polymers: approximately 0.9–1.0 g cm⁻³.

Figure A.1 Complex modulus of ISD‐110 (T₀ = 70 °C).