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Research Papers

Energy-Absorbing Capacity of Polyurethane/SiC/Glass-Epoxy Laminates Under Impact Loading

[+] Author and Article Information
G. Balaganesan

Department of Mechanical Engineering,
Indian Institute of Technology Madras,
Chennai 600036, India

V. Akshaj Kumar, V. C. Khan

Department of Mechanical Engineering,
Indian Institute of Technology Bhubaneswar,
Bhubaneswar 751013, India

S. M. Srinivasan

Department of Applied Mechanics,
Indian Institute of Technology Madras,
Chennai 600036, India
e-mail: mssiva@iitm.ac.in

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received May 31, 2016; final manuscript received November 26, 2016; published online February 7, 2017. Assoc. Editor: Taehyo Park.

J. Eng. Mater. Technol 139(2), 021008 (Feb 07, 2017) (9 pages) Paper No: MATS-16-1159; doi: 10.1115/1.4035617 History: Received May 31, 2016; Revised November 26, 2016

This paper presents the energy absorption of target materials with combinations of polyurethane (PU) foam, PU sheet, SiC inserts, and SiC plate bonded to glass fiber reinforced composite laminate backing during impact loading. SiC inserts and SiC plates are bonded as front layer to enhance energy absorption and to protect composite laminate. The composite laminates are prepared by hand lay-up process and other layers are bonded by using epoxy. Low-velocity impact is conducted by using drop mass setup, and mild steel spherical nosed impactor is used for impact testing of target in fixed boundary conditions. Energy absorption and damage are compared to the target plates when subjected to impact at different energy levels. The energy absorbed in various failure modes is analyzed for various layers of target. Failure in the case of SiC inserts is local, and the insert under the impact point is damaged. However, in the other cases, the SiC plate is damaged along with fiber failure and delamination on the composite backing laminate. It is observed that the energy absorbed by SiC plate layered target is higher than SiC inserts layered target.

Copyright © 2017 by ASME
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References

Figures

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Fig. 1

Target laminates: (a) PUF + GFRP, (b) PUS + GFRP, (c) GFRP + PUF + GFRP, and (d) GFRP + PUS + GFRP

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Fig. 2

(a) Target laminates with SiC plate and (b) target laminate with SiC inserts

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Fig. 3

Drop weight impact test setup, fixture, and specimen

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Fig. 4

Side view of crushing of core material

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Fig. 5

GFRP + PUF + GFRP laminate impacted at 160 J of incident energy

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Fig. 6

GFRP + PUS + GFRP laminate impacted at 160 J of incident energy

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Fig. 7

GFRP + PUF + GFRP laminate impacted at 240 J of incident energy

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Fig. 8

GFRP + PUS + FRP laminate impacted at 240 J of incident energy

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Fig. 9

Energy absorbed PUS + FRP laminate impacted at 80 J of incident energy

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Fig. 10

Impact on 6 mm thick front facing SiC plate layered PUF + GFRP laminate at incident energy of 240 J

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Fig. 11

The front, side, and rear views of 10 mm thickness SiC plate layered PUF + GFRP

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Fig. 12

Impact on 6 mm thick front facing SiC inserts layer at incident energy of 240 J

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Fig. 13

Scratches on the impactor due to ceramic layer

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Fig. 14

Force–time history of target material when the incident energy is 80 J

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Fig. 15

Force–time history of target material when the incident energy is 160 J

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Fig. 16

Force–time history of target material when the incident energy is 240 J

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Fig. 17

Force–time history of SiC layered target material when the incident energy is 240 J

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