Investigation into high velocity impact response of pre-loaded hybrid nanocomposite structure

Moallemzadeh, A.R.; Sabet, S. A. R.; Abedini, Hossein; Saghafi, Hamed

doi:10.1016/j.tws.2019.05.006

Cited by 24 publications

(5 citation statements)

References 37 publications

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“…However, the main factor which plays role in damage area and energy absorption is associated with projectile trajectory while perforating the corrugated core composite sandwich structures. 25 The result is shown in PFC specimen the projectile after penetrating the top face-sheet, it experience no trajectory change in the line of flight path and meet the corrugated core facing almost normal to the flight path and perforate the bottom face-sheet. However, in PFC-1 specimen, during perforation of top face-sheet, the projectile deviates from its trajectory path and hits the left wall of the central cell of core.…”

Section: Resultsmentioning

confidence: 96%

High velocity impact response of corrugated core composite sandwich structures

Dolati

Mahmood

2022

Journal of Composite Materials

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The mechanisms of projectile penetration of composite sandwich panel with empty, trapezoidal corrugated cores have been experimentally investigated. The panels have been designed to investigate the influences of specific parameters, like the fiber type of corrugated core, the projectile nose shape and the stacking sequence of face-sheets, on the impact performance from the aspects of sequential deformation, failure modes and associated mechanisms. Experimental results demonstrated that usage of Twill glass fiber in corrugated core is attained highest performance in term of energy absorption and residual velocity for the fully perforated specimens. Comparisons of panels with different stacking sequences for face-sheets verify that the corrugated core composite sandwich structures with [Formula: see text] stacking sequence is indicated the highest energy absorption. This panel is displayed a superior resistance over the ones with other stacking sequences. The hemispherical projectile is showed no deviation from the direct line of path flight relative to the conical and blunt projectile in the high velocity impact test. Moreover, the deviation of the projectile decreases the damage area in specimens.

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Section: Resultsmentioning

confidence: 96%

High velocity impact response of corrugated core composite sandwich structures

Dolati

Mahmood

2022

Journal of Composite Materials

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“…The great characteristics of fiber-reinforced polymer composite materials such as strength-to-weight ratio, durability in corrosive environment and easy application has prompted design engineers to use these materials for various marine, aerospace and constructional applications [1], so accurate characterization of these materials was required under various loading conditions, such as impact [2][3][4], fatigue [5], or exposed to harsh environments [6]. Transverse load carrying and ultimate strength of the composite materials has been often investigated under impact loads with two categorizations of high velocity (HVI) [7,8] and low velocity (LVI) [9,10] impacts, however this issue seems challenging related to the complex mechanical response of the composite laminates due to interactive reactions between the fibers and matrix and different mechanical response under in-plane and out-of-plane loads [11][12][13][14]. In spite of the significance of ultimate strength under transverse loads, an urgent feature of the composite laminates is related to the amount of residual strength in the damaged areas through the failure and after the collapse which influences on the rate of softening and the duration of temporary stability rather than a catastrophic event, however majority of the studies in this context investigated the in-plane stability of the composite laminates after impact tests, known as compression after impact (CAI) response [15][16][17][18][19], so study on the flexural residual strength of the laminates after the peak strength as the subject of the present study remains a real concern and requires to be addressed for various configurations of the laminated panels.…”

Section: Introductionmentioning

confidence: 99%

Influence of residual strength on progressive collapse of GFRP composite panels under transverse loading

Nazari,

Taheri,

Khanzadeh-Moradllo

2024

Preprint

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Collapse of panels under transverse loads has been reported dependent on formation of some unstable subregions surrounded by failure lines (hinges) within the panels, however such a collapse mechanism has been less investigated for the composite panels. In this paper, the significance of residual strength in the flexural failure lines around the unstable subregions through the collapse of GFRP panels was investigated. In the experimental program, the panels made of E-glass/vinylester composite laminates with various layups and aspect ratios were examined. To observe progression of failure lines in the panels due to large deflections, by application of a support composed of tubular components, the restraining influence of support on the panels was minimized. Based on well-known criteria, initiation and evolution of damage in the composite panels were simulated using the FE models. By a good estimation from the compressive residual strength in the failure lines based on the results of uniaxial compressive and three-point-bending tests, the FE models could simulate softening of the composite panels prior to collapse and temporary stability prior to complete loss of load carrying capacity. Using the FE models, contribution of various strain components in the flexural failure of the laminates and the influence of residual strength on the energy absorption capacity was probed for various configurations of the laminates.

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“…However, due to their low interfacial strength along the thickness direction, and the mismatch of the Poisson's ratios between the adjacent plies with different fiber orientations, delamination often occurs and it is one of the major damage modes found in these structures [1][2][3][4][5]. When this type of structure is subjected to fatigue loading, delamination can initiate and propagate due to the presence of manufacturing defects, free edge effect, external or internal ply drop, and impacts caused by foreign objects [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The effect of mode II fatigue crack growth rate on the fractographic features of CFRP composite laminates: An acoustic emission and scanning electron microscopy analysis

Mohammadi

Najafabadi

Saghafi

et al. 2021

Engineering Fracture Mechanics

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The present study is focused on the characterization of the fatigue damage features in carbon/ epoxy laminates under mode-II loading conditions. To this aim, a sinusoidal cyclic load was applied to the End-Notched Flexural (ENF) specimens and the fatigue behavior of specimens was investigated. Scanning Electron Microscope (SEM) was used to identify the damage features on the fracture surface, i.e. fiber imprints, cusps, roller cusps, and striations. It was found that the fatigue damage features, such as cusps and striations, completely depended on the fatigue crack growth rate, da/dN. In addition, a linear relationship between the fatigue striation space and the strain energy release rate range (ΔGs) and the hysteresis loop area was established. The Acoustic Emission (AE) method was also employed to characterize the damage features. The obtained results showed that higher AE energy indicates larger and rougher cusps and striation features.

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Investigation into high velocity impact response of pre-loaded hybrid nanocomposite structure

Cited by 24 publications

References 37 publications

High velocity impact response of corrugated core composite sandwich structures

High velocity impact response of corrugated core composite sandwich structures

Influence of residual strength on progressive collapse of GFRP composite panels under transverse loading

The effect of mode II fatigue crack growth rate on the fractographic features of CFRP composite laminates: An acoustic emission and scanning electron microscopy analysis

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