Impact damage characteristics in reinforced woven natural silk/epoxy composite face-sheet and sandwich foam, coremat and honeycomb materials

Ude, Albert Uchenna; Ariffin, Ahmad Kamal; Azhari, Che Husna

doi:10.1016/j.ijimpeng.2013.03.003

Cited by 59 publications

(32 citation statements)

References 26 publications

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“…This is in agreement with the observations on high velocity impact response of sandwich structures made of GFRP facesheets and polyurethane foams [24] and high velocity impact behaviour of metallic sandwich panels with aluminium foam core [16]. However, it was found that the energy absorption decreased as the impact load increased in the low velocity impact tests on sandwich panels made of woven natural silk/epoxy composite facesheet and three different core materials [21], which is contrary to the trend observed here. The absorbed energy is a combination of energy for the plastic yielding and perforation of the facesheet as well as the crushing and failure processes in the core.…”

Section: Energy Absorptionsupporting

confidence: 89%

“…It is generally accepted that low velocity impact are impacts at velocities below 10 m/s, medium velocity impact has velocities ranging from 10 to 50 m/s, and high velocity impact occurs in the 50 to 1000 m/s velocity range [18,19]. While low velocity impact [14,15,[20][21][22][23] and high velocity impact [4,16,24] response of sandwich panels are well represented in the literature, the response of sandwich panels subjected to medium velocity impacts has rarely been studied experimentally. In this paper, sandwich panels with aluminium facesheets and five different core materials are impacted at different energies using a medium velocity gas gun and a comparison based on the force-displacement response and failure modes of the panels is presented.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of the medium velocity impact response of sandwich panels with different cores

2016

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The impact response of sandwich panels is not only dependent on the facesheet but also on the core material. This paper compares the dynamic response of sandwich panels with different core materials when subjected to medium velocity impacts. The sandwich panels were made of aluminium facesheets with five different cores, viz., low density balsa wood, high density balsa wood, cork, polypropylene honeycomb, and polystyrene foam. All the specimens were impacted by an instrumented projectile with a hemispherical steel head at three impact energies of 43, 85 and 120 J. An accelerometer attached to the projectile and a high speed camera were used to collect data and record the impact process. 3D scanning technique was used to measure the deformation of front and back faces after impact. The impact properties of the sandwich panels with the five different cores were compared in terms of contact force, energy absorption, depth of indentation, overall bending deflection, etc. Post-mortem sectioning was conducted to examine the impact induced failures such as facesheet rupture, crush of core material, and debonding between facesheet and core. Finite element modelling was also carried out to elucidate the observed experimental results and further understand the effect of core material.

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Section: Energy Absorptionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Experimental study of the medium velocity impact response of sandwich panels with different cores

2016

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“…A similar trend has been reported by Ude et al [29] where they have investigated the degree of damage inflicted on the reinforced composite face-sheet and sandwich foam, core materials used in sandwich panels. The extent of damage varies for flax/UP post impacted specimens depending on incident energy level applied ( Table 2).…”

Section: Impact Damage Evaluationsupporting

confidence: 78%

The post-impact response of flax/UP composite laminates under low velocity impact loading

Dhakal

Ghasemnejad

Zhang

et al. 2018

International Journal of Damage Mechanics

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Flax fiber reinforced unsaturated polyester (UP) composite laminates were fabricated by vacuum bagging process and their impact and post-impact responses were investigated through experimental testing and finite element simulations. Samples of 60 mm x 60 mm x 6.2 mm were cut from the composite laminates and were subjected to a low-velocity impact loading to near perforation using hemispherical steel impactor at three different energy levels, 25, 27 and 29 Joules, respectively. Post impact was employed to obtain full penetration. The impacted composite plates were modelled with various lay-ups using finite element software LS-DYNA (LS-DYNA User's Manual 1997) to provide a validated FE model for the future investigation in the field. The effects of impact and post impact on the failure mechanisms were evaluated using scanning electron microscopy (SEM). Parameters measured were load bearing capability, energy absorption and damage modes. The results indicate that both peak load and the energy absorption were reduced significantly after the post impact events. Consequently, it was observed from the visual images of the damages sites that the extent of damage increased with increased incident energy and post impact events.  shear strength (MPa)

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“…This is attributed to their lightweight, high flexural and transverse shear stiffness, and good environmental resistance over solid sections [1][2][3]. However, they are susceptible to low-velocity impacts, which would result a sudden structural destruction [4]. Synthetic foam consisting of fillers with hollow cores is one of the promising core materials for sandwiches, providing superior compressive strength, high damage tolerance and excellent energy absorption [5].…”

Section: Introductionmentioning

confidence: 99%

Low-velocity impact responses and CAI properties of synthetic foam sandwiches

Wang

GangaRao

et al. 2019

Composite Structures

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This paper presents experimental and analytical studies on impact and compression after impact (CAI) responses of synthetic foam sandwiches with glass fiber reinforced polymer (GFRP) skins and synthetic foam cores under low-velocity impacting. The impact test results showed that the penetration depth of GFRP panels with synthetic foam is much smaller than that of bare synthetic foam panels. The edgewise compression test results indicated the facesheet debonding dominates the failure mode of the sandwich panels without lattice webs, while the failure mode of the sandwich panels with lattice webs is predominated by the wrinkling and delamination of the facesheets and the crushing of foam core. The influences of applied impact energy, GFRP lay-up, synthetic foam density and the existence of webs on the impact and post impact behavior of sandwich panels are discussed herein. Analytical models are proposed to predict the residual ultimate edgewise compressive load capacity of sandwich panels with lattice webs after impacts, using energy principles and variational methods in applied mechanics. The influences from impact damage, the local buckling of the facesheets and the confined strength of the foam core are measured and compared well with proposed analytical models.

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Impact damage characteristics in reinforced woven natural silk/epoxy composite face-sheet and sandwich foam, coremat and honeycomb materials

Cited by 59 publications

References 26 publications

Experimental study of the medium velocity impact response of sandwich panels with different cores

Experimental study of the medium velocity impact response of sandwich panels with different cores

The post-impact response of flax/UP composite laminates under low velocity impact loading

Low-velocity impact responses and CAI properties of synthetic foam sandwiches

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