Fracture Toughness of Chopped Glass Fiber and K.S. Parihar

  • Nirbhy Singh Defence Materials & Stores Research & Development Establishment, Kanpur.
  • Ram Khelawan Defence Materials & Stores Research & Development Establishment, Kanpur.
  • K.S. Parihar Defence Materials & Stores Research & Development Establishment, Kanpur.
Keywords: Fibre phenolic composites, Fracture toughness, Composites

Abstract

The chopped glass fibre phenolic Composite to be used for the construction of aircraft parts has been prepared and the fracture toughness of this composite was evaluated using J-integral method. The effects of humidity and 3 per cent NaCl on the fracture toughness values were also investigated. For this, a set of six specimens having crack lengths varying from 0-18 mm was tested. Five such sets of specimens were selected for the experimental studies to check the reproducibility of the results and to evaluate the effect of environment.

Author Biographies

Nirbhy Singh, Defence Materials & Stores Research & Development Establishment, Kanpur.
Dr Nirbhy Singh obtainted his MTech and PhD (Met. Engg) both from Indian Institute of Technology, Kanpur He joined DRDO as Sci C at the Defence Materials & Stores Research & Development Establishment (DMSRDE), Kanpur, in 1984, presently ,he is working as Sci F. His area of research include: Corrosion of metallic materials, fracture mechanics of metallic and non-meterials, life extension of aircraft, etc. He has published 80 reearch papers in national/international jouernals.
Ram Khelawan, Defence Materials & Stores Research & Development Establishment, Kanpur.
Mr Ram Khelawan obtained his Diploma in Electrical Engg. from the Govt. Polytechnic, Kanpur , He joined DRDO at the Solidstate Physics Laboratory (SPL), Delhi in 1983 . Later , he shifted to DMSRDE, Kanpur in 1986. His area of research include :Fabrication of fiber-reinforced plastic (FRP) Composites, metal and non metal polymer composites, all tyoes of mechnical testing, and fracture and fracture and fatigue of metallic and non- metallic meterials .
K.S. Parihar, Defence Materials & Stores Research & Development Establishment, Kanpur.
Mr KS Parihar obtanied his Bsc (Mech.Engg). from APS University, Rewa, MP. Hejoined DRDO at DMSRDE, Kanpur, in 1972. His area of research include: Design and development of engineering stores, and fracture study of polymers Composites.

References

Sih, G.C.; Hilton, P.D.; Badalliance, R.; Shemberger, P.S. & Villarreal, G. Fracture mechanic for fibrous composites. Analysis of the test method for high modulus fibres and composites. American Society of Testing Materials, USA, 1973. pp. 98-132. ASTMSTP- 521.

Mandell, J.F.; Wang, S.S. & McGarry, F.J. The extension of crack-tip damage zones in fibre-reinforced plastic laminate. J: Compos.

Mater., 1975,9(2),266.

Gaggar, S.K. & Broutman, L.J. Crack growth resistance of ran dum fibre composites. J. Compos. Mater., 1975,9,216-27.

Gaggar, S.K. & Broutman, L.J. Strength and fracture properties of randum fibre polyester composites. Fibre Sci. Technol., 1976,9,205-24.

Yeow, Y.J.; Morris, D.H. & Brinson, H.F. The fracture behaviour of graphite/epoxy lafninates. Experimental Mechanics, 1979,19(9), 1-8.

Rice, J.R. A path-independent integral and the approximate analysis of strain concentration by notches and cracks. J Appl. Mech., 1968, 35,379-86.

Brogerg, K.B. Crack growth criteria and nonlinear fracture mechanic. J. Mech. Phys. Solids, 1971,19,407-18.

Rice, J .R. & Rosengren, G .f .Plane-strain defomlation near a crack-tip in a power law hardening material. J: Mech. Phys. Solids, 1968,16,1-12.

Agarwal, B.D.; Patro, B.D. & Prashant Kumar. integral as fracture criterian for short fibre composite: An experimental approach. Enge. Fract Mech, 1984,19(4),675-84.

Parihar, K.S. & Singh, R.K. The J-integral as fracture criterian for polycarbonate thermoplastic. J. Mater. Sci., 1986,211,3921-926.

Begley, J.A. & Landes, J.D. The J-integral as a fracture criterian: Fracture toughness. American Society of Testing Materials, USA, 1972. 20 p. ASTM-S1P-54.

Published
2013-01-01
How to Cite
Singh, N., Khelawan, R., & Parihar, K. (2013). Fracture Toughness of Chopped Glass Fiber and K.S. Parihar. Defence Science Journal, 50(4), 419-423. https://doi.org/10.14429/dsj.50.3753
Section
Materials Science & Metallurgy