Low velocity flexural impact behavior of AR glass fabric reinforced cement composites |
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| Authors: | Deju Zhu Mustafa Gencoglu Barzin Mobasher |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, Arizona State University, Tempe, AZ 85287, USA;2. Division of Structural Engineering, Istanbul Technical University, Maslak, Istanbul 34469, Turkey;1. Civil Engineering Department, COPPE, Universidade Federal do Rio de Janeiro, P.O. Box 68506, CEP 21941-972 Rio de Janeiro, RJ, Brazil;2. Department of Civil Engineering, Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rua Marques de São Vicente 225, 22451-900 Rio de Janeiro, RJ, Brazil;3. Centre for Mineral Technology (CETEM), Rio de Janeiro, RJ, Brazil;1. Institute of Structural Concrete, RWTH Aachen University, Germany;2. Kempen Krause Ingenieure GmbH, Aachen, Germany;1. Univ Lyon, Ecole Nationale d’Ingénieurs de Saint-Etienne (ENISE), Laboratoire de Tribologie et de Dynamique des Systèmes (LTDS), UMR 5513, 58 rue Jean Parot, 42023 Saint-Etienne Cedex 2, France;2. LGCIE Site Bohr, Université Claude Bernard Lyon 1, Domaine Scientifique de la DOUA, 82 Boulevard Niels Bohr, 69622 Villeurbanne Cedex, France;1. Department of Structural Engineering, Ben-Gurion University of the Negev, POB 653, Beer-Sheva 84105, Israel;2. Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev, POB 653, Beer-Sheva 84105, Israel;3. Faculty of Civil and Environmental Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel;4. Protective Technologies Research and Development Center, Department of Mechanical Engineering, Ben-Gurion University of the Negev, POB 653, Beer-Sheva 84105, Israel |
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| Abstract: | Fabric–cement composites developed using the pultrusion production process have demonstrated impressive tensile and flexural properties. For instance fabric reinforced composites with bonded Alkali Resistant (AR) glass fabrics exhibit strain-hardening behavior, tensile strength in the range of 20–25 MPa, and strain capacity of the order of 2–5% under static conditions. Properties of these composite systems were investigated under three point bending conditions using an instrumented drop weight impact system. Samples were studied from the viewpoint of the variations of impact load, deflection response, acceleration and absorbed energy. Development of the testing system in terms of components and acceleration response are discussed in detail. Methods of the impact load measurement using three different ways of acceleration response, piezoelectric load washer and conventional strain gage based load cell are discussed. Cement composites with two different fabric contents and four different drop heights of hammer (dropping mass) were tested. Experimental results indicate that for the same drop height, the stiffer beam type specimens have a lower ultimate deflection but a higher load carrying capacity than the plate type specimens. The maximum flexural stress and absorbed energy of composites increase with drop height. In beam specimens, complete fracture does not take place as cracks form and close due to rebound and significant microcracking in the form of radial fan cracking is observed, whereas interlaminar shear is the dominant failure mode in the plate specimens. |
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