Prediction of mechanical behavior of composites under high strain rate tensile loading

Kumar, M. S. R. Niranjan; Naik, N.K.

doi:10.1016/j.mechrescom.2018.04.001

Cited by 20 publications

(5 citation statements)

References 42 publications

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“…Based on the mentioned references and [ 60 , 61 , 62 ], the authors introduced a bilinear hardening model for the layer, here considered a homogenous and isotropic material, as different orientations of yarns on fabric sub-layers tend create properties in a narrower range [ 63 , 64 ].…”

Section: Results Of the Simulationmentioning

confidence: 99%

Ballistic Response of a Glass Fiber Composite for Two Levels of Threat

et al. 2023

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This paper presents the behavior of composite panels based on glass fiber unidirectional fabrics and a bi-component epoxy resin under ballistic impacts that characterize two threat levels: FB2 and FB3, according to EN 1523:2004. The tested panels had characteristics kept in narrow ranges: thickness 18.26 ± 0.22 mm, mass ratio fabrics/panel 0.788 ± 0.015, surface density 27.51 ± 0.26 kg/m2. After testing the panels, the failure mechanisms of the panel were evidenced by scanning electron microscopy and photographs. Here the authors present a finite-element model at meso scale that was used for evaluating if the composite, initially tested at level FB2 (9 mm FMJ, v0 = 375 m/s), could withstand the higher level of impact, FB3 (projectile type .357 Magnum and impact velocity of v0 = 433 m/s). Simulation was performed in Explicit Dynamics (Ansys), keeping the same target but changing the projectile for the two different levels of threat. The results of the simulation were encouraging for making tests at level FB3, indicating the importance of alternating actual tests with simulations in order to achieve better protection with reduced surface weight. The simulation illustrated differences in impact duration and number of layers broken on the panel for each level. Validation of the model was based on the number of broken layers and the dimension of the delamination zone between the last two layers. Scanning electron microscopy was used for identifying failure mechanisms at the micro and meso scale. We found that damage to the composite was intensively dependent on impact velocity, this being quantitatively evaluated using the number of layers broken, the effect of delamination on separating layers and the deformation of the last layer.

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Section: Results Of the Simulationmentioning

confidence: 99%

Ballistic Response of a Glass Fiber Composite for Two Levels of Threat

et al. 2023

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“…However, the strain rate produced by traditional static and quasi-static loading test equipment is only within 1 s -1 , and the rapid loading function can produce the loading rate within 10 s -1 strain rate range, which cannot simulate the strain rate during explosion and impact. In order to study the dynamic properties of rock in this high strain rate range, the Split Hopkinson Pressure Bar (SHPB) test system is currently most widely used in experiments, which can apply dynamic loads in the range of 10 2 -10 4 s -1 strain rate to rock specimens [6][7][8][9][10]. Therefore, SHPB was used in this test to conduct impact compression test on specimens.…”

Section: Test Purpose and Methodsmentioning

confidence: 99%

Impact compression properties of artificial cemented sand material under active confining pressure

Ge¹,

Xu²

2020

J. vibroeng.

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In order to explore the mechanical properties of rock with deep in-situ stress under explosive impact, cemented sand material (artificial material) instead of rock was used to carry out impact dynamics test under the condition of confining pressure. The experimental results show that the stress-strain curve of cemented sand specimens tested by triaxial impact compression changes significantly compared with those tested by uniaxial impact compression. The dynamic failure mode of cemented sand specimens placed under confining pressure constraints is one of axial tensile failure, while the dynamic compressive growth factor, peak strain, dynamic elastic modulus, and specific energy absorption of cemented sand specimens all have the characteristics correlated with confining pressure. The research results in this study can be as an important basis for the mechanism analysis of rock breaking by blasting in deep rock mass.

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“…4 Different specimen configurations used for high strain rate tensile testing: a endthreaded cylinder, b 'hat' specimen, c end-threaded specimen with collar, d tensile specimen with bolt grips, e 'M-shaped' specimen. From [48] Fig. 5 Design using epoxy to affix the specimens to the steel fixtures.…”

Section: Tensile Loadingmentioning

confidence: 99%

“…The data often exhibits more scatter in high-rate experiments [46,60], though it is difficult to separate experimental artefacts from random variation in true material response -an issue discussed in more detail later in this review.. Further, the stacking sequence and reinforcement texture may affect the results [69]. Several models have focussed on high strain rate tensile failure [48,70]. The (relatively) one-dimensional failure modes allow the complexities seen elsewhere to be ignored.…”

Section: Tensile Loadingmentioning

confidence: 99%

Measuring the Effect of Strain Rate on Deformation and Damage in Fibre-Reinforced Composites: A Review

Perry

Walley

2022

J. dynamic behavior mater.

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This review aims to assess publications relevant to understanding the rate-dependent dynamic behaviour of glass- and carbon-fibre reinforced polymer composites (FRPs). FRPs are complex structures composed of fibres embedded in a polymer matrix, making them highly anisotropic. Their properties depend on their constituent materials as well as micro-, meso- and macro-scale structure. Deformation proceeds via a variety of damage mechanisms which degrade them, and failure can occur by one or more different processes. The damage and failure mechanisms may exhibit complex and unpredictable rate-dependence, with certain phenomena only observable under specific loading conditions or geometries. This review focusses on experimental methods for measuring the rate-dependent deformation of fibre composites: it considers high-stain-rate testing of both specimens of ‘simple’ geometry as well as more complex loadings such as joints, ballistic impact and underwater blast. The effects of strain rate on damage and energy-based processes are also considered, and several scenarios identified where strength and toughness may substantially decrease with an increase in strain rate.

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Prediction of mechanical behavior of composites under high strain rate tensile loading

Cited by 20 publications

References 42 publications

Ballistic Response of a Glass Fiber Composite for Two Levels of Threat

Ballistic Response of a Glass Fiber Composite for Two Levels of Threat

Impact compression properties of artificial cemented sand material under active confining pressure

Measuring the Effect of Strain Rate on Deformation and Damage in Fibre-Reinforced Composites: A Review

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