| dc.creator |
Anand, Lallit |
|
| dc.date |
2003-11-10T19:24:07Z |
|
| dc.date |
2003-11-10T19:24:07Z |
|
| dc.date |
2003-01 |
|
| dc.date.accessioned |
2013-10-09T02:31:50Z |
|
| dc.date.available |
2013-10-09T02:31:50Z |
|
| dc.date.issued |
2013-10-09 |
|
| dc.identifier |
http://hdl.handle.net/1721.1/3660 |
|
| dc.identifier.uri |
http://koha.mediu.edu.my:8181/xmlui/handle/1721 |
|
| dc.description |
This paper summarizes a recently developed continuum theory for the elastic-viscoplastic deformation of amorphous solids such as polymeric and metallic glasses. Introducing an internal-state variable that represents the local free-volume associated with certain metastable states, we are able to capture the highly non-linear stress-strain behavior that precedes the yield-peak and gives rise to post-yield strain-softening. Our theory explicitly accounts for the dependence of the Helmholtz free energy on the plastic deformation in a thermodynamically consistent manner. This dependence leads directly to a backstress in the underlying flow rule, and allows us to model the rapid strain-hardening response after the initial yield-drop in monotonic deformations, as well as the Bauschinger-type reverse-yielding phenomena typically observed in amorphous polymeric solids upon unloading after large plastic deformations. We have implemented a special set of constitutive equations resulting from the general theory in a finite-element computer program. Using this finite-element program, we apply the specialized equations to model the large-deformation response of the amorphous polymeric solid polycarbonate, at ambient temperature and pressure. We show numerical results to some representative problems, and compare them against corresponding results from physical experiments. |
|
| dc.description |
Singapore-MIT Alliance (SMA) |
|
| dc.format |
211086 bytes |
|
| dc.format |
application/pdf |
|
| dc.language |
en_US |
|
| dc.relation |
Advanced Materials for Micro- and Nano-Systems (AMMNS); |
|
| dc.subject |
amorphous solids |
|
| dc.subject |
metallic glasses |
|
| dc.subject |
plasticity |
|
| dc.subject |
polymeric glasses |
|
| dc.title |
A continuum theory of amorphous solids undergoing large deformations, with application to polymeric glasses |
|
| dc.type |
Article |
|