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Advanced 3D and 2D damage assessment of low velocity impact response of glass and Kevlar fiber reinforced epoxy hybrid composites
Published in Taylor and Francis Ltd.
2018
Volume: 4
   
Issue: 3
Pages: 493 - 510
Abstract

This work focuses on quasi-static mechanical (tensile, flexural, indentation), low velocity impact (LVI) and viscoelastic behaviour of different stacking sequences [(30 K 1 /0 G 14 /30 K 1 ) and (45 K 1 /0 G 14 /45 K 1 )] of 16 layers woven roving Kevlar-E-glass/epoxy interply hybrid composites. The outermost layers are Kevlar and remaining 14 E-glass layers are placed as interior for making these hybrid laminates. The viscoelastic properties are measured over the temperature range from 25 °C (room temperature) to 180 °C at three different frequencies (1, 10 and 50 Hz) by using the dynamic mechanical analyzer (DMA). The LVI results indicated that (45 K 1 /0 G 14 /45 K 1 ) Kevlar-glass/epoxy hybrid laminates exhibit the highest damage threshold load (DTL) whereas (30 K 1 /0 G 14 /30 K 1 ) laminates possess the higher peak load and threshold and maximum energies. Advanced non-destructive testing techniques (NDT) such as X-ray computed tomography (X-CT) and ultrasonic C-scan are employed to evaluate the micro and macro damage mechanisms of LVI tested specimens, respectively. Detailed observations have been made on the onset and growth of cracks in 30°, 45° and 0° plies using X-CT scan imaging. These images show that the bottommost plies subjected to more impact than the topmost plies, the outer Kevlar plies protect the inner 0° glass plies and delays the delamination propagation. ‘C’ scan images indicate that (30 K 1 /0 G 14 /30 K 1 ) laminates spread the damage to more area. The scanning electron microscopy (SEM) is used for examining the failure mechanisms of indentation specimens. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.

About the journal
JournalData powered by TypesetAdvances in Materials and Processing Technologies
PublisherData powered by TypesetTaylor and Francis Ltd.
ISSN2374068X
Open AccessNo