On the dynamic fragmentation of two limestones using edge-on impact tests

Grange, Sébastien; Forquin, Pascal; Mencacci, S; Hild, François

doi:10.1016/j.ijimpeng.2007.07.006

Cited by 52 publications

(31 citation statements)

References 40 publications

(50 reference statements)

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“…To study the kinetic of damage at a laboratory scale, EOI tests were developed by the Ernst-Mach-Institute (EMI) in Germany (Hornemann et al 1984;Strassburger and Senf 1994) and in Centre Technique d'Arcueil in France (Riou 1996;Denoual 1998;Forquin 2003). These experiments are particularly adapted to analyze the dynamic fragmentation in brittle materials such as glass (Hornemann et al 1984;Brajer et al 2003), ceramics (Strassburger and Senf 1994;Riou et al 1998;Denoual and Hild 2000;Forquin et al 2003), rocks (Grange et al 2008) or high-strength concretes Forquin and Hild 2008). In open configuration, the fragmentation process may be observed as function of time by using a high speed camera.…”

Section: Edge-on Impact Testsmentioning

confidence: 99%

“…When a concrete target is subjected to impact, a multiple fragmentation composed of numerous oriented cracks may occur due to tensile hoop stresses at high strain-rates (Riou et al 1998;Forquin et al 2003Grange et al 2008;Forquin andHild 2008, 2009). This phenomenon may be numerically described by constitutive relations to evaluate the level of damage within the core of impacted structures.…”

Section: Modelling Of Dynamic Fragmentation Of Mb50 In Edge-on Impactmentioning

confidence: 99%

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Dynamic fragmentation process in concrete under impact and spalling tests

Forquin

Erzar

2009

Int J Fract

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Intense damages as scabbing on front face, spalling on rear face, radial cracks are observed in concrete structures when subjected to the impact of a kinetic striker. To characterize the dynamic strength and damage of concretes under such loadings one may perform spalling tests and EOI (edge-on impact) tests. Both tests have been conducted with dry and wet specimens of a micro-concrete named MB50. The tests revealed a remarked effect of strain-rate and free water on the dynamic response of the concrete. In parallel, bending tests and direct tensile tests have been performed with dry and saturated concrete samples considering large and small effective volumes and the results have been compared with five sets of data given in the literature with the same material. A scale effect is observed in agreement with prediction of Weibull theory. Moreover, an anisotropic damage model that describes the initiation of cracks and the obscuration of critical defects under high strain-rate tensile loading is presented. It allows accounting for the influence of loading-rate and free-water on the dynamic strength and damage of concrete observed in EOI and spalling tests.

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Section: Edge-on Impact Testsmentioning

confidence: 99%

Section: Modelling Of Dynamic Fragmentation Of Mb50 In Edge-on Impactmentioning

confidence: 99%

Dynamic fragmentation process in concrete under impact and spalling tests

Forquin

Erzar

2009

Int J Fract

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“…The EOI technique has been widely used to investigate the damage modes produced by impact loadings of ceramic materials [12,46,47], ultra-high-strength concrete [48] and rocks [3,15,49]. An ultra-high-speed camera is used in the so-called open experimental configuration to observe the growth of damage at recording frequencies of approximately 1 Mfps (million frames per second).…”

Section: Experimental Techniques Devoted To Brittle Materialsmentioning

confidence: 99%

Brittle materials at high-loading rates: an open area of research

Forquin¹

2017

Phil. Trans. R. Soc. A.

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Brittle materials are extensively used in many civil and military applications involving high-strain-rate loadings such as: blasting or percussive drilling of rocks, ballistic impact against ceramic armour or transparent windshields, plastic explosives used to damage or destroy concrete structures, soft or hard impacts against concrete structures and so on. With all of these applications, brittle materials are subjected to intense loadings characterized by medium to extremely high strain rates (few tens to several tens of thousands per second) leading to extreme and/or specific damage modes such as multiple fragmentation, dynamic cracking, pore collapse, shearing, mode II fracturing and/or microplasticity mechanisms in the material. Additionally, brittle materials exhibit complex features such as a strong strain-rate sensitivity and confining pressure sensitivity that justify expending greater research efforts to understand these complex features. Currently, the most popular dynamic testing techniques used for this are based on the use of split Hopkinson pressure bar methodologies and/or plate-impact testing methods. However, these methods do have some critical limitations and drawbacks when used to investigate the behaviour of brittle materials at high loading rates. The present theme issue of Philosophical Transactions A provides an overview of the latest experimental methods and numerical tools that are currently being developed to investigate the behaviour of brittle materials at high loading rates. This article is part of the themed issue ‘Experimental testing and modelling of brittle materials at high strain rates’.

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“…10 since only mode I cracks are explicitly described in the present model. However, it was shown that as a first approximation this type model is able to account for confined damage in rocks (Grange et al 2008).…”

Section: Edge-on Impactmentioning

confidence: 99%

On the dynamic fragmentation of glass: a meso-damage model

2009

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This paper presents an anisotropic damage model to deal with the fragmentation induced by impact loadings on glass samples. As small-scale (i.e., subelement) damage is described as well as cracks extending above the element scale, an approach referred to as "meso-damage" is developed. The latter, which is based on the knowledge of random distributions of initiation sites, predicts different regimes such as single or multiple fragmentation. The experimental opening crack pattern obtained in edge-on-impact test is reproduced numerically.

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On the dynamic fragmentation of two limestones using edge-on impact tests

Cited by 52 publications

References 40 publications

Dynamic fragmentation process in concrete under impact and spalling tests

Dynamic fragmentation process in concrete under impact and spalling tests

Brittle materials at high-loading rates: an open area of research

On the dynamic fragmentation of glass: a meso-damage model

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