Research Papers: Design for Manufacturing

A Concept for a Material That Softens With Frequency

[+] Author and Article Information
J. Prasad

Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824-1226prasadji@msu.edu

A. R. Diaz

Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824-1226diaz@egr.msu.edu

J. Mech. Des 130(9), 091703 (Aug 18, 2008) (7 pages) doi:10.1115/1.2965596 History: Received October 24, 2007; Revised April 14, 2008; Published August 18, 2008

This work presents design concepts to synthesize composite materials with special dynamic properties, namely, materials that soften at high frequencies. Such dynamic properties are achieved through the use of a two-phase material that has inclusions of a viscoelastic material of negative elastic modulus in a typical matrix phase that has a positive elastic modulus. A possible realization of the negative-stiffness inclusion phase is presented. A numerical homogenization technique is used to compute the average viscoelastic properties of the composite. The method and the properties of a composite material designed with it are demonstrated through an example.

Copyright © 2008 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 1

A two-phase periodic composite material. The dashed box shows the fundamental cell.

Grahic Jump Location
Figure 2

Standard linear solid model of viscoelasticity

Grahic Jump Location
Figure 3

A potential arrangement of Constituents B1 and B2 to form Material B

Grahic Jump Location
Figure 4

Two-dimensional lattice of Phase B1

Grahic Jump Location
Figure 5

Representative cell characterizing the (periodic) mixture of Materials A and B

Grahic Jump Location
Figure 6

Components of the effective elastic tensor after mixing A and B

Grahic Jump Location
Figure 7

Phase B as a layered material

Grahic Jump Location
Figure 8

Vibration-isolation system

Grahic Jump Location
Figure 9

The effective complex modulus EC(ω)

Grahic Jump Location
Figure 10

Vibration-isolation device as a spring-damper system

Grahic Jump Location
Figure 11

Spring stiffness (k(ω)) and damping coefficient (δ(ω)) of the vibration-isolation device

Grahic Jump Location
Figure 12

Transmissibility as a function of frequency



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In