Time Dependent Materials

There are many problems in modern engineering practice that require a detailed knowledge of how materials respond to loads over extended periods of time in a variety of applications and designs. Metals, as well as soils and concrete, exhibit creep behavior under certain conditions and this phenomenon has been traditionally incorporated into engineering education and practice.

During the past few decades, polymers and their composites have increasingly entered the domain of engineering design. These are the time-dependent materials par excellence. Their inroads into mechanical engineering practice has multiplied the need for deepening of our understanding of the role of time-dependence in materials behavior.

The Division intends to include in its purview also other time-dependent materials such as metals and ceramics at high temperatures, as well as wood and soils.

Officers
*Chair*	Richard Hall Air Force Research Laboratory richard.hall@wpafb.af.mil
*Co-Chair*	H. Jerry Qi University of Colorado qih@colorado.edu
*Secretary*

Time Dependent Materials Division - Updated April 2009

Meeting minutes, Wed June 4, 2008, Orlando, FL

1. Minutes of June 7, 2007 meeting were approved.

2. Prof. Ioannis Chasiotis reviewed the symposia organized at the 2008 Orlando meeting
  i. 3 sessions of “Time-Dependent Materials,” Organized by Profs. Y. Miyano, H.Lu, R. Bradshaw, I.Emri and I. Chasiotis, 17 papers.

  ii. 2 sessions of Time Dependent Behavior of Liquid Crystals and Polymeric Mixtures, organized by Profs I. Emri and S. Kralj, 10 papers.

3. Request for symposia organization for 2009 SEM meeting in Albuquerque NM, May 31-June 3. Tentative titles and organizers:

  i. Nano-Indentation of Time-Dependent materials - R. Singh and H. Lu

  ii. Time-Dependent Constitutive Behavior – R. Hall and H. Lu

   - In addition to the general emphases across materials, specific targets for participation are: high strain rate testing and modeling; biomaterials; time-dependent fracture; time-dependent nanocomposites.

  iii. Soft materials and polymeric mixtures – S. Kralj and I. Emri.

  iv. Time-dependent composites – R. Hall and G.P. Tandon

4. The need for a better list of potential attendees from Japan was discussed. Prof. Masa Takashi provided Prof. Hongbing Lu with several names of potential attendees from Japan who may be able to solicit more participants.

5. At the Albuquerque meeting in 1 year, officers will transition and we will need a new division secretary.