Response of high performance concrete plates to impact of non-deforming projectiles

Dancygier, Avraham N.; Yankelevsky, David Z.; Jaegermann, C.

doi:10.1016/j.ijimpeng.2006.09.094

Cited by 169 publications

(86 citation statements)

References 6 publications

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“…Experimental studies performed around the world [3][4][5][6][7][8][9][10][11] have shown that the addition of fibres to concrete affects the damage caused by impact, but the structural behaviours of targets subjected to highvelocity impact are complicated. In order to further study how the addition of various volume fractions of fibres to concrete affect the projectile resistance, numerical simulations were conducted in the programme AUTODYN.…”

Section: Discussionmentioning

confidence: 99%

“…In the comparative study presented in this paper, where the effect of added steel fibres in the concrete was limited to an improved postcracking behaviour, the numerical model for fibre-reinforced concrete was not validated against measured damage variables from a specific experiment. The numerical results from simulations with fibrereinforced concrete, which are assumed to give the overall behaviour of projectile impact on fibrereinforced concrete compared to plain concrete, were compared to conclusions drawn from experiments described in [3][4][5][6][7][8][9][10][11]. The procedure is schematically illustrated in Fig.…”

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confidence: 99%

“…Researchers have experimentally studied the behaviour of fibre-reinforced concrete under impact loading and observed a significant increase in the overall resistance to local damage when compared to plain concrete [3][4][5][6][7][8][9][10][11]. However, the structural behaviours of targets subjected to impact are complicated, depending on material factors as well as test-condition factors [6], which vary between the reported experiments and therefore make it difficult to draw generic conclusions of the effect of fibres and how it changes with different amounts of fibres in the concrete.…”

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Comparative numerical studies of projectile impacts on plain and steel-fibre reinforced concrete

Nyström

Gylltoft

2011

International Journal of Impact Engineering

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The enhanced energy absorption characteristics of fibre-reinforced concrete, compared to plain concrete, has in experimentally studies been shown to improve the projectile resistance and motivate its increased usage in protective structures. However, the high cost of undertaking experiments and the high parameter variation and dependency of the experimental setups and results, respectively, make it difficult to draw generic conclusions of how the addition and increased amount of fibres affects the local damage caused by projectile impact, which motivates the use of numerical simulations to study this. The numerical hydrocode AUTODYN was used in a qualitative study of how the addition of different amounts of fibres, modelled as different post-crack relations, influence the depth of penetration and crater formation on the front and rear face of a concrete target. Fibres added to the concrete mix had a minor influence on the depth of penetration while the crater size on both front and rear faces of the target decreases. The crack propagation beyond the crater on the front face was also reduced when fibres were added to the concrete. An increased amount of fibres in the concrete showed no effect on the size of the front-face crater, but led to further decreased size of the crater on the rear face of the concrete cylinder. It is concluded that the scabbing crater can be reduced in size and prevented by usage of fibre-reinforced concrete even if the depth of penetration is only slightly less than to penetration depth in plain concrete.Keywords: Numerical simulation, Projectile impact, Steel-fibre reinforced concrete, Penetration 1.Introduction A projectile impact may cause local and global damage to a concrete structure. Global damage consists of flexural deformations, which, unlike local damage, may cause structural failure. Local damage may cause spalling and crushing of concrete on the front face and scabbing on the rear face of the target, together with projectile penetration into the target or even full penetration (i.e. perforation) of the target [1,2]. Different variables have been proposed to measure local damage, such as depth of penetration, perforation and scabbing thickness or ballistic limit (i.e. the minimum velocity at which the projectile penetrates the target) in plain or reinforced concrete [2].Researchers have experimentally studied the behaviour of fibre-reinforced concrete under impact loading and observed a significant increase in the overall resistance to local damage when compared to plain concrete [3][4][5][6][7][8][9][10][11]. However, the structural behaviours of targets subjected to impact are complicated, depending on material factors as well as test-condition factors [6], which vary between the reported experiments and therefore make it difficult to draw generic conclusions of the effect of fibres and how it changes with different amounts of fibres in the concrete.The local damage parameters in concrete are often estimated by using empirical, semi-empirical or purely analytical eq...

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Comparative numerical studies of projectile impacts on plain and steel-fibre reinforced concrete

Nyström

Gylltoft

2011

International Journal of Impact Engineering

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“…Fibre reinforced concrete subject to projectile impact has been observed to exhibit less damage than plain concrete [9,10]. Maalej et al [11] found that hybrid fibre reinforced concrete (using combinations of two or more types of fibres in the same concrete mixture) offered increased shatter resistance with reduced scabbing, spalling and fragmentation, whilst exhibiting better energy absorption.…”

Section: A C C E P T E D Article In Pressmentioning

confidence: 99%

Dynamic enhancement of blast-resistant ultra high performance fibre-reinforced concrete under flexural and shear loading

Millard

Molyneaux

Barnett

et al. 2010

International Journal of Impact Engineering

157

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Two independent projects are described in which drophammer techniques are used to investigate the dynamic increase factor (DIF) under both flexural and shear high-speed loading of a new ultra high performance fibre reinforced blast resistant concrete. The results from both studies correlate well. The results show that a DIF of the flexural tensile strength rising from 1.0 at 1 s -1 on a slope of 1/3 on a log (strain rate) versus log (DIF) plot can be used for design purposes. The results also show that no DIF should be used to increase the shear strength at high loading rates.

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“…The effect of the maximum aggregate size on the penetration resistance and the fragments size distribution of thin target were studied by Werner et al (2013). Dancygier et al (2007) studied the effects of maximum coarse aggregate size and type on the perforation limit and front and rear face crater diameter of thin target. Dancygier et al (2014) studied the effect of maximum coarse aggregate size on the damage and penetration resistance of double layer thin target.…”

Section: Introductionmentioning

confidence: 99%

Study of the anti-penetration performance of concrete with different coarse aggregate content

Wu¹,

Li²,

Shen³

2018

Lat. Am. j. solids struct.

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Deep penetration experiments were performed on five types of concrete with different coarse aggregate content. The projectile diameter was 29.9 mm, the initial velocity was 647 m/s, and the volume fraction of the coarse aggregate was between 0% and 59.0%. The damage laws and damage mechanism of the target were analyzed. The pure mortar target had the smallest radial crack origin diameter and crater depth. Too high of the coarse aggregate content led to the formation of many voids, which led to the disappearance of radial cracks, crater surface bypassing the coarse aggregate and a large reduction of crater diameter. The influence laws and mechanism of the coarse aggregate on the penetration depth were also analyzed. The increase of volume fraction of coarse aggregate was beneficial to reducing penetration depth and the increase of voids volume fraction was opposite. The penetration depth was the lowest when the volume fraction of the coarse aggregate reached the maximum and no voids formed. By modifying the static resistance stress in the Forrestal penetration formula, a penetration depth model considering the volume fractions of the coarse aggregate and voids was established. The predicted results were in good agreement with the experimental results.

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Response of high performance concrete plates to impact of non-deforming projectiles

Cited by 169 publications

References 6 publications

Comparative numerical studies of projectile impacts on plain and steel-fibre reinforced concrete

Comparative numerical studies of projectile impacts on plain and steel-fibre reinforced concrete

Dynamic enhancement of blast-resistant ultra high performance fibre-reinforced concrete under flexural and shear loading

Study of the anti-penetration performance of concrete with different coarse aggregate content

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