Impact testing of concrete using a drop-weight impact machine

Banthia, Nemkumar; Mindess, Sidney; Bentur, A.; Pigeon, M.

doi:10.1007/bf02327783

Cited by 236 publications

(127 citation statements)

References 10 publications

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“…The samples were simply supported on a support anvil using the same span length (140 mm) used during static tests and impacted with an energy of 50 J. Because of the sample inertial effect, the load measured by the force transducer mounted on the impactor does not represent the actual bending load acting on the sample [18].…”

Section: Resultsmentioning

confidence: 99%

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Mechanical response of a fibre reinforced earthen material under static and impact loadings

Aymerich

Fenu

Francesconi

et al. 2015

EPJ Web of Conferences

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Abstract. This study examines the improvements provided by the insertion of hemp fibres with different weight fractions and lengths in an earthen material. The structural response of the materials was investigated by means of static and impact bending tests carried out on notched samples. The main focus of the analyses was in the characterization of the structural properties of the materials in terms of fracture resistance, post-cracking performance and energy absorption capability. The results of the study show that hemp fibres improve significantly the mechanical and fracture properties of the earthen material under both static and dynamic bending. It was also found that the structural properties of unreinforced and reinforced earthen materials are highly sensitive to the stress-rate, with higher strength and fracture resistance under impact loading than under static loading.

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Section: Resultsmentioning

confidence: 99%

“…Following [18], the true impact force for bending was obtained by subtracting the generalized inertial force from the force measured at the impactor. The generalized inertial force was calculated as a function of the acceleration at the mid-span, assuming a linear distribution of the acceleration along the sample.…”

Section: Resultsmentioning

confidence: 99%

Mechanical response of a fibre reinforced earthen material under static and impact loadings

Aymerich

Fenu

Francesconi

et al. 2015

EPJ Web of Conferences

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“…of agreement would not be expected since the inertial force and rotational effects are significant [16].…”

Section: Liverpool Drop-hammer Testsmentioning

confidence: 95%

“…1 -100 s -1 is a strain rate typical for concrete subjected to conventional military weapons [16]. 1 s -1 was measured by the Authors for a wall structure under blast loading at large standoff, see Section 1.0.…”

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

158

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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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“…Many different experimental techniques have been developed in the past in order to determine the appropriate constitutive material behaviour at high strain rates [10]: drop weight test [2,18], Hopkinson and split Hopkinson bar [1,8], Charpy pendulum [11], etc. When the investigated materials are homogeneous, or have few small imperfections, relatively small samples can be tested in order to check their dynamic properties.…”

Section: Introductionmentioning

confidence: 99%

A New Apparatus for Large Scale Dynamic Tests on Materials

2016

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The development of an innovative apparatus, based on Hopkinson bar techniques, for performing large scale dynamic tests is presented and discussed. The activity is centered at the recently upgraded HOPLAB facility, which is basically a split Hopkinson bar with a total length of approximately 200 m, with bar diameters of 72 mm and where force pulses up to 2 MN and 40 ms duration can be generated and strain rates up to 50 s −1 can be achieved. Several modifications in the basic configuration have been introduced: twin incident and transmitter bars have been installed with strong steel plates at their ends where large specimens can be placed. A series of calibration and quantification tests has been conducted in order to prove the reliability of the experimental technique proposed. Moreover, real tests on concrete cylindrical samples of 200 mm diameter and of up to 400 mm length have been performed. Analyses of recorded signals indicate proper Hopkinson bar testing conditions and reliable functioning of the facility.

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Impact testing of concrete using a drop-weight impact machine

Cited by 236 publications

References 10 publications

Mechanical response of a fibre reinforced earthen material under static and impact loadings

Mechanical response of a fibre reinforced earthen material under static and impact loadings

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

A New Apparatus for Large Scale Dynamic Tests on Materials

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