Viscoelastic (Memory) Foam Published by the Polyurethane Foam Association www.pfa.org IN•TOUCH is a publication of the Polyurethane Foam Association (PFA) that covers topics of interest to users of flexible polyurethane foam. Volume 11 | No. 1 (Revised 2016) description of viscoelastic polyurethane foam as "dead" or

VISCOELASTICITY Viscoelastic materials can exhibit both viscous and elastic behavior. They can therefore be seen as a combination of both ideal types of materials: purely viscous fluids and ideally elastic solids. The flow properties of a purely viscous material can be determined in a simple flow experiment. If F s Gg F kx = = x or s =hg& = or The comprehensive book introduces simple and effective approaches for describing the damping related properties of viscoelastic materials, with emphasis on the effects of frequency and temperature, and proceeds to illustrate simple techniques for measuring the desired properties and for selecting and applying the materials. The comprehensive book introduces simple and effective approaches for describing the damping related properties of viscoelastic materials, with emphasis on the effects of frequency and temperature, and proceeds to illustrate simple techniques for measuring the desired properties and for selecting and applying the materials. Students are introduced to the concept of viscoelasticity and some of the material behaviors of viscoelastic materials, including strain rate dependence, stress relaxation, creep, hysteresis and preconditioning. Viscoelastic material behavior is compared to elastic solids and viscous fluids. Those familiar with the author's precursor book, Viscoelastic Solids, will see that this book contains many updates and expanded coverage of the materials science, causes of viscoelastic behavior, properties of materials of biological origin, and applications of viscoelastic materials. handbook of viscoelastic vibration damping Download handbook of viscoelastic vibratio