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Validation of two different analysis techniques to obtain dynamic mechanical properties of concrete using a modified Hopkinson Bar.

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Title: Validation of two different analysis techniques to obtain dynamic mechanical properties of concrete using a modified Hopkinson Bar.
Authors: Rey-de-Pedraza, V.1 (AUTHOR) v.rey@upm.es, Ruiz-Ripoll, M.L.2 (AUTHOR), Roller, C.2 (AUTHOR), Cendón, D.A.1 (AUTHOR), Gálvez, F.1 (AUTHOR)
Source: International Journal of Impact Engineering. Mar2022, Vol. 161, pN.PAG-N.PAG. 1p.
Subjects: Fracture strength, Tensile strength, Concrete, Strain rate, Concrete fractures
Abstract: • The interest in the Hopkinson Bar technique can be appreciated in the variety of test configurations developed. • The firing system used, length and geometry of the bars, instrumentation and recorded data, opens a broadband of results and interpretations. • A compared study over tensile and fracture energy tests is carried confronting two methodologies to check the validity of the results predicted. • The influence of the projectile shape in the procedure and results is also critical and must be analysed. In the present work, two different approaches for obtaining dynamic fracture properties of concrete are analyzed. Spalling tests over cylindrical samples using a modified Hopkinson Bar were carried to measure the tensile strength and the fracture energy of conventional concrete. Results for strain rates ranging from 60 to 130 s − 1 are presented for both techniques and compared to the respective quasi-static values. Moreover, two different projectile shapes (cylindrical and conical) have also been evaluated. In this sense, a deep qualitative and quantitative analysis is also performed, regarding the variations in tensile stress evolution of the pulses. Validation of both methodologies is achieved by comparing the obtained results. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• The interest in the Hopkinson Bar technique can be appreciated in the variety of test configurations developed. • The firing system used, length and geometry of the bars, instrumentation and recorded data, opens a broadband of results and interpretations. • A compared study over tensile and fracture energy tests is carried confronting two methodologies to check the validity of the results predicted. • The influence of the projectile shape in the procedure and results is also critical and must be analysed. In the present work, two different approaches for obtaining dynamic fracture properties of concrete are analyzed. Spalling tests over cylindrical samples using a modified Hopkinson Bar were carried to measure the tensile strength and the fracture energy of conventional concrete. Results for strain rates ranging from 60 to 130 s − 1 are presented for both techniques and compared to the respective quasi-static values. Moreover, two different projectile shapes (cylindrical and conical) have also been evaluated. In this sense, a deep qualitative and quantitative analysis is also performed, regarding the variations in tensile stress evolution of the pulses. Validation of both methodologies is achieved by comparing the obtained results. [ABSTRACT FROM AUTHOR]
ISSN:0734743X
DOI:10.1016/j.ijimpeng.2021.104107