A quasi-static indentation test to elucidate the sequence of damage events in low velocity impacts on composite laminates

Wagih, A.; Maimí, P.; Blanco, N.; Costa, J.

doi:10.1016/j.compositesa.2015.11.041

Cited by 132 publications

(63 citation statements)

References 32 publications

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“…During the loading phase, the contact force generally grows larger with load increasing. The first force drop is at about 0.3ms as matrix cracks happen at lower plies, which is consistent with the results reported in [14]. With load upon approximate while a gradual coarser mesh up to 1.0×1.0mm in size is applied away from the i region.…”

Section: Results and Discussion 421 Global Impact Responsesupporting

confidence: 90%

“…During the loading phase, the contact force generally grows large load increasing. The first force drop is at about 0.3ms as matrix cracks happen at lower which is consistent with the results reported in [14]. With load upon approximate 290 about 0.5ms, the visible delamination leads to a sudden big drop in the force-time h This point usually corresponds to the delamination threshold in [15,16], wher delamination separates the laminate and cause large overall stiffness degradation.…”

Section: Results and Discussion 421 Global Impact Responsesupporting

confidence: 87%

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A Study on the Failure Mechanisms of Composite Laminates Simultaneously Impacted by Two Projectiles

Teng

2018

Advanced Composites Letters

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With most studies concentrated on the single point isolated impact events, this work mainly investigates the failure mechanisms of composite laminates simultaneously impacted by two projectiles over low energies. A 3D intralaminar damage model combining continuum damage mechanics to analyze the in-ply damage and cohesive interface elements to simulate the delamination are applied to model the damage evolution of E-glass/epoxy composites simultaneously impacted by two projectiles. The damage model is incorporated into the Abaqus/Explicit by the subroutine VUMAT. A comparison between the simulated predictions and the experimental observations of laminates impacted by one projectile is made to verify the reasonability of the damage model applied. The simulation results indicate that the delamination initiation is not largely affected by the impact energy and the number of the projectiles. As the combined effects of the two projectiles on the laminate, the intersection of matrix damage areas in plies and the connection of delamination regions at interfaces, largely decrease the overall stiffness of the laminate and result in more serious damage.

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Section: Results and Discussion 421 Global Impact Responsesupporting

confidence: 90%

Section: Results and Discussion 421 Global Impact Responsesupporting

confidence: 87%

A Study on the Failure Mechanisms of Composite Laminates Simultaneously Impacted by Two Projectiles

Teng

2018

Advanced Composites Letters

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“…The last section shows the complete perforation and penetration of indenter to the composite samples. The similar finding was also reported by Bulut and Erklig [13] [15]. The energy absorbed (E) was obtained from area under graph of force-displacement.…”

Section: Quasi-static Indentation Test (Qsi)supporting

confidence: 84%

Qua si Static Indentation Behavior o f Nanoclay Chopped Carbon Fibres Composites

Jumahat*,

Roslan,

Sapiai

et al. 2019

IJEAT

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This paper presents the Quasi Static Indentation (QSI) behavior of the chopped carbon fibre composites with three different loadings of nanoclay. The composites, which are Carbon fibre (CF), 1wt% Nanoclay–Carbon Fibre (1NC-CF), 3wt% Nanoclay–Carbon Fibre (3NC-CF) and 5wt% Nanoclay–Carbon Fibre (5NC-CF) were prepared using hand lay-up method. The nanoclay was dispersed using a three roll milling machine. The 10wt% of chopped carbon fibres with 3-5 mm length were used in fabricating these composites. The QSI test was conducted using Universal Testing Machine according to the ASTM D6264. The damage section was examined using optical microscopy. The results show that the energy absorbed was increased with addition of nanoclay up to 81.42 %, 137.69 % and 202.95 % for 1NC-CF, 3NC-CF and 5NC-CF composites, respectively. It was concluded that the addition of the nanoclay enhanced the QSI of chopped carbon fibres composites

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“…Fiber Reinforced Polymer (FRP) composites have key advantages such as high specific strength and stiffness, high corrosion resistance, and high fatigue life [1,2]. Despite these advantages, they are susceptible to Barely Visible Impact Damage (BVID) under transverse loadings [3,4]. Low-Velocity Impact (LVI) is a common transverse load that may be applied to a composite structure during its service life, such as dropping a tool on the laminate surface during maintenance process, bird strike phenomenon during airplane landing or takeoff, and impact of hailstones to the composite structures during a hailstorm [5].…”

Section: Introductionmentioning

confidence: 99%

Barely visible impact damage assessment in laminated composites using acoustic emission

Saeedifar

Najafabadi

Zarouchas

et al. 2018

Composites Part B: Engineering

111

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Despite the key advantages of Fiber Reinforced Polymer (FRP) composites, they are susceptible to Barely Visible Impact Damage (BVID) under transverse loadings. This study investigates BVID in two quasi-isotropic carbon/ epoxy laminates under quasi-static indentation and Low-Velocity Impact (LVI) loadings using Acoustic Emission (AE). First, the evolution of interlaminar and intralaminar damages is studied by analyzing the AE signals of the indentation test using b-value and sentry function methods. Then, the specimens are subjected to the LVI loading and the induced damages are compared with the indentation test and the percentage of each damage mechanism is calculated using Wavelet Packet Transform (WPT). In consistent with the mechanical data, ultrasonic C-scan and digital camera images of the specimens, the AE results show a considerable similarity between the induced BVID under quasi-static indentation and LVI tests. Finally, the obtained results show that AE is a powerful tool to study BVID in laminated composites under quasi-static and dynamic transverse loadings.

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A quasi-static indentation test to elucidate the sequence of damage events in low velocity impacts on composite laminates

Cited by 132 publications

References 32 publications

A Study on the Failure Mechanisms of Composite Laminates Simultaneously Impacted by Two Projectiles

A Study on the Failure Mechanisms of Composite Laminates Simultaneously Impacted by Two Projectiles

Qua si Static Indentation Behavior o f Nanoclay Chopped Carbon Fibres Composites

Barely visible impact damage assessment in laminated composites using acoustic emission

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