PhD Proposal by Narayan Shirolkar

Event Details
  • Date/Time:
    • Thursday April 11, 2019
      9:00 am - 11:00 am
  • Location: MRDC 4211
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Summaries

Summary Sentence: Processing, Structure, and Properties of Continuous Carbon Materials with Different Cross-sectional Geometries: Towards Lighter Composites

Full Summary: No summary paragraph submitted.

THE SCHOOL OF MATERIALS SCIENCE AND ENGINEERING

 

GEORGIA INSTITUTE OF TECHNOLOGY

 

Under the provisions of the regulations for the degree

DOCTOR OF PHILOSOPHY

on Thursday, April 11, 2019

9:00 AM
in MRDC 4211

 

will be held the

 

DISSERTATION PROPOSAL DEFENSE

for

 

Narayan Shirolkar

 

"Processing, Structure, and Properties of Continuous Carbon Materials

with Different Cross-sectional Geometries: Towards Lighter Composites"

 

Committee Members:

 

Prof. Satish Kumar, Advisor, MSE

Prof. Jonathan Colton, ME

Prof. Kyriaki Kalaitzidou, ME

Prof. Meisha Shofner, MSE

Prof. Natalie Stingelin, MSE

 

Abstract:

 

Carbon fibers are finding increased usage in a wide variety of applications ranging from aerospace to energy harvesting to sports goods etc. Lighter and stronger than aluminum as well as steel, carbon fibers are an attractive candidate for lightweight structural materials. Carbon fiber composites make up to 50% of the structural weight of modern fuel-efficient aircrafts like the Boeing 787 Dreamliner. However, over the past three decades the improvement in the mechanical properties of carbon fibers has been incremental. In fact, the commercially used aerospace grade carbon fibers today were first manufactured more than 30 years ago. It is therefore necessary to explore alternative routes to improve the specific tensile properties of carbon fibers. This can be done by either reducing the density of the fibers without compromising their mechanical properties or by making composites with higher than 60% reinforcements by volume.

 

Using a gel-spun bi-component islands-in-a-sea precursor with polyacrylonitrile (PAN) as the sea component and polymethylmethacrylate (PMMA) as the sacrificial island component, hollow carbon fibers with a honeycomb cross-section have been produced. While these fibers have a tensile modulus higher than the commercially available carbon fibers, the tensile strength needs to be improved. In this work, by understanding the structural evolution of the fibers during continuous stabilization and carbonization, attempts will be made to further improve the mechanical properties of the hollow carbon fibers.

 

The specific mechanical properties of the composites can be improved if higher carbon loading is achieved. To achieve this, an alternative geometry viz. near rectangular film cross-section is explored. It is hypothesized that carbon films as compared to fibers, will allow higher carbon loading in composites. Roll-to-roll manufacturing of continuous carbon films using continuous stabilization and carbonization is reported for the first time. Preliminary characterization results are reported. In this study, the processing of continuous gel-spun PAN based carbon films will be studied. Structure-property relationship will be investigated to optimize the carbon film manufacturing process. 

 

Keywords: Hollow carbon fibers, carbon films, structural materials, lightweight materials

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Phd proposal
Status
  • Created By: Tatianna Richardson
  • Workflow Status: Published
  • Created On: Mar 27, 2019 - 4:09pm
  • Last Updated: Mar 27, 2019 - 4:09pm