Compressive Behaviors of Micropillar Patterns Made of PDMS Material using the Finite Element Method

Authors

  • Thitikan Pakawan Kasetsart University
  • Tumrong Puttapitukporn Kasetsart University
  • Nithi Atthi National Electronics and Computer Technology Center (NECTEC), Thailand
  • Witsaroot Sripumkhai National Electronics and Computer Technology Center (NECTEC), Thailand
  • Pattaraluck Pattamang National Electronics and Computer Technology Center (NECTEC), Thailand
  • Nipapan Klunngien National Electronics and Computer Technology Center (NECTEC), Thailand
  • Wutthinan Jeamsaksiri National Electronics and Computer Technology Center (NECTEC), Thailand

DOI:

https://doi.org/10.4186/ej.2021.25.1.69

Keywords:

Hydrophobic surface, Polydimethylsiloxane, Micro-pattern, Finite element analysis, ANSYS

Abstract

Hydrophobic surface is a surface having the ability of water repellent which is frequently coated on medical devices and marine structures. This hydrophobic surface can fabricate from micro-pattern sheets consisting of groups of micropillars arranged into unique micro-patterns which are normally made of low surface energy materials. Thai Microelectronics Center (TMEC) has fabricated micropillar sheets from PDMS for various micropillar array patterns from soft lithography techniques. However, these micropillar sheets were relatively weak under pushing forces. This research aimed to understand compressive behaviors of rectangular prism micropillars having different aspect ratios (ratio of width to length of a rectangular cross-section) and micro-patterns consisting of micropillars having rectangular cross-section and square cross-section by using ANSYS Mechanical APDL program. We found that the aspect ratio of prism micropillars had not influents on both elastic stiffness and compressive strength under compressive loading. The lateral collapse of micropillars were observed on all micro-patterns during compressive loading. Furthermore, the sharklet micro-pattern had the highest compressive strength with maximum compressive pressure of 9.87 kPa. Finally, as loading contact area of micro- patterns increases, the compressive strength increases while the water contact angle decreases.

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Author Biographies

Thitikan Pakawan

Department of Mechanical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand

Tumrong Puttapitukporn

Department of Mechanical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand

Nithi Atthi

Thai Microelectronics Center (TMEC), National Electronics and Computer Technology Center (NECTEC), Chachoengsao 24000, Thailand

Witsaroot Sripumkhai

Thai Microelectronics Center (TMEC), National Electronics and Computer Technology Center (NECTEC), Chachoengsao 24000, Thailand

Pattaraluck Pattamang

Thai Microelectronics Center (TMEC), National Electronics and Computer Technology Center (NECTEC), Chachoengsao 24000, Thailand

Nipapan Klunngien

Thai Microelectronics Center (TMEC), National Electronics and Computer Technology Center (NECTEC), Chachoengsao 24000, Thailand

Wutthinan Jeamsaksiri

Thai Microelectronics Center (TMEC), National Electronics and Computer Technology Center (NECTEC), Chachoengsao 24000, Thailand

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Published In
Vol 25 No 1, Jan 31, 2021
How to Cite
[1]
T. Pakawan, “Compressive Behaviors of Micropillar Patterns Made of PDMS Material using the Finite Element Method”, Eng. J., vol. 25, no. 1, pp. 69-80, Jan. 2021.