American Society of Civil Engineers


Dynamic Fragmentation of an Ultrahigh-Strength Concrete during Edge-On Impact Tests


by Pascal Forquin, (Asst. Prof., LPMM, CNRS-UMR7554, Univ. Paul Verlaine, Ile du Saulcy, F-57045 Metz Cedex 1, France; formerly, DGA/CTA-Dépt. MSP, 16 bis avenue Prieur de la Côte d’Or, F-94114 Arcueil Cedex, France) and Francois Hild Hild, (corresponding author), (Res. Prof., LMT-Cachan, ENS de Cachan, CNRS-UMR 8535, Univ. Paris 6, 61 Ave. du Président Wilson, F-94235 Cachan Cedex, France E-mail: hild@lmt.ens-cachan.fr)

Journal of Engineering Mechanics, Vol. 134, No. 4, April 2008, pp. 302-315, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9399(2008)134:4(302))

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Document type: Journal Paper
Abstract: To understand and model damage generated during impact by a penetrator of ultrahigh strength concrete targets, edge-on impact tests are performed with Ductal concrete, which is unreinforced or reinforced with short fibers. Two edge-on impact configurations are designed with a dynamic confinement system. The first configuration uses aluminum projectiles and allows us to study the dynamic fragmentation that spreads out within the tile without any confined damage close to the impact point. The fragmentation process is composed of numerous oriented millimetric cracks. In the second configuration, steel projectiles are used with a higher impact velocity. Damaged zones are visualized by using an ultrahigh speed camera and a sarcophagus configuration designed to prevent the fragments from moving. Postmortem studies of impacted tiles enabled us to observe an intense fragmentation of the targets and confined damage close to the impact point when steel projectiles were used. Simulations are performed with an anisotropic damage model coupled with a concrete plasticity model. Orientation and crack density are compared with postmortem observations.


ASCE Subject Headings:
Cracking
Damage
Dynamic tests
High-strength concrete
Probability