Influence of hBN and MoS2 fillers on toughness and thermal stability of carbon fabric-epoxy composites

Yermal Shriraj Rao; Shivamurthy Basavannadevaru; Nanjangud Mohan Subbarao; Nagaraja Shetty

doi:10.3221/IGF-ESIS.62.17

Authors

Mr. Yermal Shriraj Rao Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India https://orcid.org/0000-0003-3653-6977
Dr. B. Shivamurthy Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India
Dr. Nanjangud Subbarao Mohan Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India
Dr. Nagaraja Shetty Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India

DOI:

https://doi.org/10.3221/IGF-ESIS.62.17

Keywords:

Molybdenum disulfide, Boron nitride, Fracture toughness, Thermal stability, Microhardness, Fracture surface morphology

Abstract

Hexagonal boron nitride (hBN) and molybdenum disulfide (MoS₂) fillers of 2 to 8 wt.% influence on toughness, microhardness and thermal stability of carbon fabric-reinforced epoxy composite (CFREC) reported. Mode-I, mixed-mode I/II toughness and microhardness of CFREC improved due to the addition of hBN and MoS₂ separately upto 6 wt.% filler loading. The epoxy matrix in CFREC modified by hBN and MoS₂ strengthens the matrix, deflects the crack path and resists delamination. Toughness reduced beyond 6 wt.% filler addition due to agglomeration and poor fiber-filler-matrix bonding as revealed by the surface morphology of the fracture specimen. Thermal analysis reveals decomposition temperature at 25% weight loss increased from 395 to 430 °C and 395 to 411 °C due to 4 wt.% MoS₂ and 4 wt.% hBN addition to CFREC respectively. Impermeable characteristics of MoS₂ and hBN fillers caused tortuous diffusion path for gas molecules and delayed thermal decomposition.

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Author Biographies

Mr. Yermal Shriraj Rao, Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India

Mr. Yermal Shriraj Rao, PhD scholar in the Department of Mechanical and Industrial Engineering at Manipal Institute of Technology, MAHE, India. He received his B.E. degree in Mechanical Engineering and M.Tech. degree in Machine Design in 2015 and 2017, respectively. He received first rank with gold medal for being the academic topper in both B.E. and M.Tech. He is working on the characterization of Polymer nanocomposites, Fracture toughness and Machining studies of composites. He has published several research articles in national and international journals of repute.
Dr. B. Shivamurthy, Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India

Dr. Basavannadevaru Shivamurthy, Associate Professor (Senior Scale) in the Department of Mechanical and Industrial Engineering at Manipal Institute of Technology, MAHE, India. He received PhD from National Institute of Technology Karnataka-Surathkal. He worked in polymer industries for about 10 years in addition to 21 years of teaching and research. His research interests are Nanocomposites and applications, Tribology of polymers, Composites using industry and recycled waste, EMI shielding materials, High-velocity impact-resistant material and Biopolymers. He has published several research articles in national and international journals of repute.
Dr. Nanjangud Subbarao Mohan, Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India

Dr. Nanjangud Subbarao Mohan, Professor in the Department of Mechanical and Industrial Engineering at Manipal Institute of Technology, MAHE Manipal, India. He completed PhD from Manipal Institute of Technology. He has 35 years of experience in teaching as well as research. His research interests are Machining of polymer nanocomposites and Hygrothermal aging studies of natural fiber composite. He has published several research articles in national and international journals of repute.
Dr. Nagaraja Shetty, Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India

Dr. Nagaraja Shetty, Associate Professor in the Department of Mechanical and Industrial Engineering at Manipal Institute of Technology, MAHE Manipal, India. He received PhD from National Institute of Technology Karnataka-Surathkal. He has 8 years of experience in teaching and research. His areas of interest include the Machining and Structure-property studies of Polymer composites, Design of Experiments and Optimization techniques. He has published several research articles in national and international journals of repute.