Buckling of Magnetically Formed Filler Fiber Columns under Compression Increases Thermal Resistance of Soft Polymer Composites

Matthew Ralphs, Chandler Scheitlin, Robert Wang, Konrad Rykaczewski

Research output: Contribution to journalArticle

Abstract

Thermally conductive soft composites are in high demand, and aligning the fill material is a potential method of enhancing their thermal performance. In particular, magnetic alignment of nickel particles has previously been demonstrated as an easy and effective way to improve directional thermal conductivity of such composites. However, the effect of compression on the thermal performance of these materials has not yet been investigated. This work investigates the thermal performance of magnetically aligned nickel fibers in a soft polymer matrix under compression. The fibers orient themselves in the direction of the applied magnetic field and align into columns, resulting in a 3× increase in directional thermal conductivity over unaligned composites at a volume fraction of 0.15. Nevertheless, these aligned fiber columns buckle under strain resulting in an increase in the composite thermal resistance. These results highlight potential pitfalls of magnetic filler alignment when designing soft composites for applications where strain is expected such as thermal management of electronics.

LanguageEnglish (US)
Article number012001
JournalJournal of Heat Transfer
Volume141
Issue number1
DOIs
StatePublished - Jan 1 2019

Fingerprint

thermal resistance
buckling
fillers
Heat resistance
Buckling
Fillers
Polymers
Compaction
composite materials
fibers
Fibers
Composite materials
polymers
Nickel
Thermal conductivity
thermal conductivity
alignment
nickel
Polymer matrix
Volume fraction

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Buckling of Magnetically Formed Filler Fiber Columns under Compression Increases Thermal Resistance of Soft Polymer Composites. / Ralphs, Matthew; Scheitlin, Chandler; Wang, Robert; Rykaczewski, Konrad.

In: Journal of Heat Transfer, Vol. 141, No. 1, 012001, 01.01.2019.

Research output: Contribution to journalArticle

@article{610a5e606317447b99a246d38d61ea46,
title = "Buckling of Magnetically Formed Filler Fiber Columns under Compression Increases Thermal Resistance of Soft Polymer Composites",
abstract = "Thermally conductive soft composites are in high demand, and aligning the fill material is a potential method of enhancing their thermal performance. In particular, magnetic alignment of nickel particles has previously been demonstrated as an easy and effective way to improve directional thermal conductivity of such composites. However, the effect of compression on the thermal performance of these materials has not yet been investigated. This work investigates the thermal performance of magnetically aligned nickel fibers in a soft polymer matrix under compression. The fibers orient themselves in the direction of the applied magnetic field and align into columns, resulting in a 3× increase in directional thermal conductivity over unaligned composites at a volume fraction of 0.15. Nevertheless, these aligned fiber columns buckle under strain resulting in an increase in the composite thermal resistance. These results highlight potential pitfalls of magnetic filler alignment when designing soft composites for applications where strain is expected such as thermal management of electronics.",
author = "Matthew Ralphs and Chandler Scheitlin and Robert Wang and Konrad Rykaczewski",
year = "2019",
month = "1",
day = "1",
doi = "10.1115/1.4041539",
language = "English (US)",
volume = "141",
journal = "Journal of Heat Transfer",
issn = "0022-1481",
publisher = "American Society of Mechanical Engineers(ASME)",
number = "1",

}

TY - JOUR

T1 - Buckling of Magnetically Formed Filler Fiber Columns under Compression Increases Thermal Resistance of Soft Polymer Composites

AU - Ralphs, Matthew

AU - Scheitlin, Chandler

AU - Wang, Robert

AU - Rykaczewski, Konrad

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Thermally conductive soft composites are in high demand, and aligning the fill material is a potential method of enhancing their thermal performance. In particular, magnetic alignment of nickel particles has previously been demonstrated as an easy and effective way to improve directional thermal conductivity of such composites. However, the effect of compression on the thermal performance of these materials has not yet been investigated. This work investigates the thermal performance of magnetically aligned nickel fibers in a soft polymer matrix under compression. The fibers orient themselves in the direction of the applied magnetic field and align into columns, resulting in a 3× increase in directional thermal conductivity over unaligned composites at a volume fraction of 0.15. Nevertheless, these aligned fiber columns buckle under strain resulting in an increase in the composite thermal resistance. These results highlight potential pitfalls of magnetic filler alignment when designing soft composites for applications where strain is expected such as thermal management of electronics.

AB - Thermally conductive soft composites are in high demand, and aligning the fill material is a potential method of enhancing their thermal performance. In particular, magnetic alignment of nickel particles has previously been demonstrated as an easy and effective way to improve directional thermal conductivity of such composites. However, the effect of compression on the thermal performance of these materials has not yet been investigated. This work investigates the thermal performance of magnetically aligned nickel fibers in a soft polymer matrix under compression. The fibers orient themselves in the direction of the applied magnetic field and align into columns, resulting in a 3× increase in directional thermal conductivity over unaligned composites at a volume fraction of 0.15. Nevertheless, these aligned fiber columns buckle under strain resulting in an increase in the composite thermal resistance. These results highlight potential pitfalls of magnetic filler alignment when designing soft composites for applications where strain is expected such as thermal management of electronics.

UR - http://www.scopus.com/inward/record.url?scp=85056095152&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85056095152&partnerID=8YFLogxK

U2 - 10.1115/1.4041539

DO - 10.1115/1.4041539

M3 - Article

VL - 141

JO - Journal of Heat Transfer

T2 - Journal of Heat Transfer

JF - Journal of Heat Transfer

SN - 0022-1481

IS - 1

M1 - 012001

ER -