Hysteresis modeling of porous SMA for drug delivery system designed and fabricated by the laser-assisted sintering

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Abstract

In this report we develop a complete mathematical model for a porous scaffold from nitinol (NiTi - intermetallic phase) with a shape memory effect (SME), fabricated layerwise via the selective laser sintering (SLS) process. The operation of the SME bio-fluidic MEMS involves such physical process as a heat transfer, a phase transformation with a temperature hysteresis, stress-strain and electrical resistance variations accompanied the phase transformation. The simulations were conducted for the electro- and a thermo- mechanical hysteresis phenomenon, during the SME in the porous nitinol structures of the cylinder shape, which allow to formulate a recommendations for SLS. Previously done the temperature evolution of electrical resistivity was compared with our present calculations as a function of the laser-processing parameters for three dimensional nitinol samples. This model can be used for an estimation of a drug delivery system route during a porous phase volume changing.

Original languageEnglish
JournalMaterials Research Society Symposium - Proceedings
Volume1569
DOIs
Publication statusPublished - 2013
Externally publishedYes
Event2013 MRS Spring Meeting - San Francisco, CA, United States
Duration: 1 Apr 20135 Apr 2013

Keywords

  • Biomaterial
  • Fluidics
  • Microelectro-mechanical (MEMS)

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