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Low Velocity Response of GFRP and Hybrid Laminates Under Impact Testing

  • H. ShettyEmail author
  • D. Sethuram
Article
  • 5 Downloads

Abstract

This paper analyses the improvements in falling weight impact resistance characteristics of the laminates when highly flexible Polycarbonate (PC) sheet is sandwiched between Glass Fiber Reinforced Polymer (GFRP) laminates. Towards this, low-velocity impact (LVI) tests at different impact energies were conducted on various thicknesses of GFRP and hybrid laminates. For each given incident impact energy, the load—time data were extracted and the transient absorbed energy, as well as displacement, are computed by numerical integration. The impact energy obtained from this data is computed for all the laminates. Experimental investigation reveals that the hybrid laminate shows a significant increase in the maximum impact energy that can be absorbed before complete perforation as compared to bare GFRP laminate. Other impact resistance characteristics such as initial stiffness and peak load as a function of incident impact energy have been analyzed and the influence of PC insertion in the laminate (hybrid) on these parameters are experimentally investigated.

Keywords

Hybrid laminates Low-velocity Impact Incident Impact energy Absorbed energy Initial stiffness 

List of Symbols

Vf

Volume fraction of fibre

Vm

Volume fraction of matrix

Wf

Wight fraction of fibre

\(\rho_{f}\)

Density of fibre

\(\rho_{m}\)

Density of matrix

\(V_{GFRP}\)

Volume fraction of GFRP

\(V_{PC}\)

Volume fraction of PC sheet

\(t_{GFRP}\)

Thickness of GFRP laminate

\(t_{PC}\)

Thickness of PC sheet

\(t_{hybrid}\)

Thickness of hybrid laminate

\(\rho_{GFRP}\)

Density of GFRP laminate

\(\rho_{PC}\)

Density of PC sheet

\(\rho_{hybrid}\)

Density of hybrid laminate

\(v\left( t \right)\)

Indenter velocity at time, t

\(v_{i}\)

Incident impact velocity at height ‘h’

\(m\)

Mass of indenter

\(F\left( t \right)\)

Contact force measured at time, t

\(\delta \left( t \right)\)

Indenter displacement at time, t

\(\delta_{i }\)

Indenter displacement from reference at time t = 0

\(E_{a} \left( t \right)\)

Absorbed energy at time, t

\(E_{iep}\)

Impact energy that causes complete perforation in J

\(E_{aep}\)

Maximum absorbed energy at the onset of complete perforation in J

\(P_{peak}\)

Peak load absorbed by the laminate during LVI in N

\(\left( {\frac{P}{\Delta }} \right)_{i}\)

Initial stiffness of laminate during LVI in N/m

IE

Impact energy in J

Eabs

Absorbed energy in J

Notes

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Copyright information

© Society for Experimental Mechanics, Inc 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringPES UniversityBengaluruIndia

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