Dynamic tensile fracture of mortar at ultra-high strain-rates

Erzar, B.; Buzaud, Eric; Chanal, P.-Y.

doi:10.1063/1.4852935

Cited by 11 publications

(10 citation statements)

References 17 publications

(16 reference statements)

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“…This power model has already been identified for standard concrete using quasistatic direct tension experiments and spalling tests conducted with a Hopkinson bar device [18], and with ultra-high strain-rate uniaxial deformation tests carried out with a pulsed power generator named GEPI [19]. The strainrate sensitivity of UHPC and UHPFRC has been investigated with the same devices.…”

Section: Strain-rate Sensitivity Of Tensile Strengthmentioning

confidence: 99%

Impact response of UHPC and UHPFRC: experimental study and numerical simulation

Pontiroli¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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When a projectile hits a concrete target, several specific mechanisms are activated. Craters forms on front and rear faces of the target mainly due to shear and tensile damage. In the vicinity of the projectile nose, the concrete material is subjected to intense pressures (several hundreds of MPa), increasing its apparent ductility. Ultra-high performance concrete (UHPC) and ultra-high performance fiber reinforced concrete (UHPFRC) represent new opportunities to design protective structures. The compressive strength of these materials is commonly five times the one of standard concrete. Compared to usual concrete, the tensile behaviour of UHPC is also different: the composition is optimized to reduce the porosity and fibers can be included in the formulation (UHPFRC). To study the impact response of this kind of materials, penetration tests are conducted in Gramat on Ductal ® FM targets using a steel projectile. Perforation experiments allowed investigating the influence of steel fibers on the impact craters and exit velocities. To simulate impact event on UHPFRC, the Pontiroli-Rouquand-Mazars (PRM) model developed in CEA-Gramat is modified based on characterization tests performed on material specimens. Hydrostatic loading, triaxial tests and shock experiments are done to study the compressive response of UHPC under high confining pressures. Quasi-static bending tests and spalling experiments are useful to investigate the tensile response and the influence of fibers on the fracture energy. This modified version of the PRM model is used to simulate the impact response of UHPC and UHPFRC.

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Section: Strain-rate Sensitivity Of Tensile Strengthmentioning

confidence: 99%

Impact response of UHPC and UHPFRC: experimental study and numerical simulation

Pontiroli¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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“…This power model has already been identified for standard concrete using quasi-static direct tension experiments, spalling tests conducted with a Hopkinson bar device [12] and with ultrahigh strain-rate uniaxial deformation tests carried out with a pulsed-power generator (générateur électrique de pression intense, GEPI) [13].…”

Section: (B) Strain-rate Sensitivity Of Tensile Strengthmentioning

confidence: 99%

“…Based on a Hopkinson bar device, spalling tests can be conducted to obtain data at high loading rates (approx. 100 s −1 [12]), while for higher strain rates (greater than 1000 s −1 ) a new approach using a pulsed-power generator has been used [13].…”

Section: (C) Plasticity and Compaction Modellingmentioning

confidence: 99%

“…At high strain rates, the tensile strength of concrete can be investigated through spalling tests. Tests have been conducted on UHPFRC with an electromagnetic machine [13,25] to the internal skin of the electrodes. This compressive wave propagates through the electrodespecimen stacking until it reaches a specimen free-surface.…”

Section: (C) Plasticity and Compaction Modellingmentioning

confidence: 99%

See 1 more Smart Citation

Ultra-high performance fibre-reinforced concrete under impact: experimental analysis of the mechanical response in extreme conditions and modelling using the Pontiroli, Rouquand and Mazars model

Erzar

Pontiroli

Buzaud

2017

Phil. Trans. R. Soc. A.

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To evaluate the vulnerability of ultra-high performance fibre-reinforced concrete (UHPFRC) infrastructure to rigid projectile penetration, over the last few years CEA-Gramat has led an experimental and numerical research programme in collaboration with French universities. During the penetration process, concrete is subjected to extreme conditions of pressure and strain rate. Plasticity mechanisms as well as dynamic tensile and/or shear damage are activated during the tunnelling phase and the cratering of the concrete target. Each mechanism has been investigated independently at the laboratory scale and the role of steel fibres especially has been analysed to understand their influence on the macroscopic behaviour. To extend the experimental results to the structural scale, penetration tests on UHPFRC slabs have been conducted by CEA-Gramat. The analysis of this dataset combined with material characterization experiments allows the role of steel fibres to be identified in the different plasticity and damage mechanisms occurring during penetration. In parallel, some improvements have been introduced into the concrete model developed by Pontiroli, Rouquand and Mazars (PRM model), especially to take into account the contribution made by the fibres in the tensile fracture process. After a primary phase of validation, the capabilities of the PRM model are illustrated by performing numerical simulations of projectile penetration into UHPFRC concrete structures.This article is part of the themed issue 'Experimental testing and modelling of brittle materials at high strain rates'.

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“…This machine is used to study the dynamic behaviour of inert materials like ceramics [25,26], metals, composites [29] and mortar [30]. Its primary energy storage is composed of 28 stages and the total energy stored reaches 70 kJ from a charging voltage of 85 kV.…”

Section: Dynamic Characterizationsmentioning

confidence: 99%