Thermal Studies of Three-Dimensional Printing Using Pulsed Laser Heating

Yue Xiao, Zhihan Hong, Garret Coleman, Hongbo Zhao, Rongguang Liang, Pierre Lucas, Qing Hao

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Laser-based three-dimensional (3D) printing of polymers is a promising technology in fabricating complicated structures for applications in bioengineering, optics and molding. Infrared (IR) laser-assisted thermal curing printing technique offers high controllability by heating up the sample locally. Compared with other techniques like ultraviolet (UV) curing, IR laser-assisted thermal curing avoids yellowing issue, which is a common problem in UV curing. Accurate thermal simulations of the polymer curing processes under the laser heat is crucial to the design and improvement of the printing apparatus. In this work, a multi-physics simulation is carried out to predict the temperature rise and the curing extent profile of polydimethylsiloxane (PDMS) heated by a periodic, pulsed laser. The simulation incorporates the coupling between the local heating and the curing extent change. The cured spot sizes are provided for the given duty cycle and laser pulse period. The exothermic enthalpy of PDMS during the curing process is also measured to improve the simulation accuracy. The simulation results are validated with experiments using a pulsed 2 µm IR laser. This technique can control the polymer curing to achieve a minimum feature size of ~20 µm. Various patterns are fabricated to demonstrate the flexibility of this technique.

Original languageEnglish (US)
Pages (from-to)21-26
Number of pages6
JournalES Materials and Manufacturing
Volume1
DOIs
StatePublished - Sep 2018

Keywords

  • 3D printing
  • Laser-assist printing
  • Thermal simulation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Metals and Alloys
  • Applied Mathematics
  • Polymers and Plastics
  • Numerical Analysis
  • Building and Construction
  • Modeling and Simulation

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