High strength concrete response to hard projectile impact

Dancygier, Avraham N.; Yankelevsky, David Z.

doi:10.1016/0734-743x(95)00063-g

Cited by 157 publications

(68 citation statements)

References 2 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%

“…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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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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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%

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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“…It may reduce interfacial bonding in the matrix and cause micro-crack, afterwards propagation crack growth. Structure shield needs high strength to prevent dynamic loading, thus it is important to enhance the ductility [9]. The presence Polypropylene Fibre (denoted as PF) that drawn into admixture resulted fibrillation and interfacial bonding between PF and matrix eventually reduce micro-cracks [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Impact Resistance Foamed Concrete Reinforced by Polypropylene Fibre

Mujahid¹,

Hadipramana

Samad³

et al. 2013

KEM

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Abstract. Foamed Concrete (FC) needs high strength to prevent dynamic loading, thus it is important to enhance the ductility. Usage the Polypropylene Fibre (PF) examined its contribution in strength of FC on impact resistance. Microstructures were observed that air voids in matrix of FC produce micro-porous that reduce interfacial bonding into matrix and generate micro-crack that may propagation crack growth. Presence of PF in admixture results fibrillation and reduces microcracks. Tensile test was investigated that PF delays crack growth in matrix. In this investigation impact test were conducted using an instrumented drop-weight impact tower. When impactor hits the target surface in free surface condition causes compressive plastic wave transform to be tensile wave. It was affected by tensile strength therefore local effect has not found spalling in crater field. In addition influence of porous in matrix FC has ability to absorb the energy and it was not found distal crack around surface area. Penetration depth results showed FC with PF subjected to impact loading was lower than without FC. Presence of PF increases FC strength and local effect results there was not impression of fragments around distal surface due to brittle crushing.

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“…In other countries, cement-based composite materials were tested using an apparatus through a high-speed projectile crash to evaluate the impact resistance performance when given a direct impact [3,4], on which basis an analysis model was developed and tested [5,6] Hence, this study aims to review the effect of the compressive strength of and fiber mix proportion in mortar and concrete on impact resistance performance under a high-speed crash condition, using an apparatus for testing impact resistance performance by high-speed projectile crash. In addition, considering the thickness of concrete and the crash energy of the high-speed projectile, data on the evaluation of impact resistance performance is collected to be utilized in the future as fundamental data for impact resistance performance design of fiber reinforced cement composite.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Impact Resistance of Steel Fiber and Organic Fiber Reinforced Concrete and Mortar

Kim¹,

Hwang²,

Nam³

et al. 2012

Journal of the Korea Institute of Building Construction

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In this study, the Impact resistance of steel fiber and organic fiber reinforced concrete and mortar was evaluated and the improvement in toughness resulting from an increase in compressive strength and mixing fiber for impact resistance on performance was examined. The types of fiber were steel fiber, PP and PVA, and these were mixed in at 0.1, 0.5 and 1.0 vol.%, respectively. Impact resistance is evaluated with an apparatus for testing impact resistance performance by high-speed projectile crash by gas-pressure. For the experimental conditions, Specimen size was 100×100×20, 30mm (width×height×thickness). Projectile diameter was 7 and 10 mm and impact speed is 350m/s. After impact test, destruction grade, penetration depth, spalling thickness and crater area were evaluated. Through this evaluation, it was found that as compressive strength is increased, penetration is suppressed. In addition, as the mixing ratio of fiber is increased, the spalling thickness and crater area are suppressed. Organic fibers have lower density than the steel fiber, and population number per unit area is bigger. As a result, the improvement of impact resistance is more significant thanks to dispersion and degraded attachment performance.

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High strength concrete response to hard projectile impact

Cited by 157 publications

References 2 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

Investigation on Impact Resistance Foamed Concrete Reinforced by Polypropylene Fibre

Evaluation of Impact Resistance of Steel Fiber and Organic Fiber Reinforced Concrete and Mortar

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