Full Content is available to subscribers

Subscribe/Learn More  >

Non-Linear Viscoplastic Material Modeling of the Degradation Response of PLA

[+] Author Affiliations
Jorgen S. Bergstrom, David J. Quinn, Samual Chow, Sekar M. Govindarajan

Veryst Engineering, Needham, MA

Paper No. FMD2013-16120, pp. V001T10A028; 3 pages
  • ASME 2013 Conference on Frontiers in Medical Devices: Applications of Computer Modeling and Simulation
  • ASME 2013 Conference on Frontiers in Medical Devices: Applications of Computer Modeling and Simulation
  • Washington, DC, USA, September 11–13, 2013
  • Conference Sponsors: Bioengineering Division
  • ISBN: 978-0-7918-5600-0
  • Copyright © 2013 by ASME


The bioabsorbable thermoplastic Poly(lactic acid), PLA, is extensively used in many medical applications including surgical sutures, drug delivery systems, internal fixation devices, tissue engineering scaffolds, and drug eluting stents. Frequently, a PLA component is required to withstand mechanical loading for a desired amount of time and then degrade via hydrolysis. In its raw, undegraded form, PLA exhibits a non-linear, viscoplastic mechanical response. Through the degradation process, the modulus, yield stress and flow behavior of PLA changes. Accurate simulations of bioabsorbable implants require a constitutive model that accounts for the viscoplastic nature of the material and its evolution over time. In this work we present the development of a new material model framework for predicting the time-dependent viscoplastic response of PLA. The proposed material model also captures the change in mechanical behavior over time due to hydrolysis. The details of the proposed model are presented, and the model predictions are compared to preliminary experimental data.

Copyright © 2013 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

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 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