The Experts below are selected from a list of 3402 Experts worldwide ranked by ideXlab platform

C. Kolitawong - One of the best experts on this subject based on the ideXlab platform.

  • Experimental investigation on high strain rate tensile behaviors of steel cord-rubber composite
    Composite Structures, 2013
    Co-Authors: Naruepon Eiamnipon, Pongsak Nimdum, Jacques Renard, C. Kolitawong
    Abstract:

    High strain rate tensile tests of steel cord-rubber composite with different cord orientations have been performed on a Servo-Hydraulic Testing Machine. Two types of steel cord arrangement reinforcing to the same rubber material have been studied. Material properties and damage behaviors were identified. Damage mechanisms were studied for range of the strain rates going from 3.3 × 10−3 to 131 s−1. The effect of strain rate revealed tendencies of tensile fracture properties on the steel cord-rubber composites. The onset and the propagation of damage such as interfacial debonding were observed using high speed camera in order to understand damage mechanisms. The failure modes were found to be dependent on the cord orientations inducing particularly tensile fracture properties.

  • Experimental investigation on high strain rate tensile behaviors of steel cord–rubber composite
    Composite Structures, 2013
    Co-Authors: Naruepon Eiamnipon, Pongsak Nimdum, Jacques Renard, C. Kolitawong
    Abstract:

    Abstract High strain rate tensile tests of steel cord–rubber composite with different cord orientations have been performed on a Servo-Hydraulic Testing Machine. Two types of steel cord arrangement reinforcing to the same rubber material have been studied. Material properties and damage behaviors were identified. Damage mechanisms were studied for range of the strain rates going from 3.3 × 10 −3 to 131 s −1 . The effect of strain rate revealed tendencies of tensile fracture properties on the steel cord–rubber composites. The onset and the propagation of damage such as interfacial debonding were observed using high speed camera in order to understand damage mechanisms. The failure modes were found to be dependent on the cord orientations inducing particularly tensile fracture properties.

Barzin Mobasher - One of the best experts on this subject based on the ideXlab platform.

  • High speed imaging in dynamic tensile Testing of fabric-cement composites
    Application of Imaging Techniques to Mechanics of Materials and Structures Volume 4, 2012
    Co-Authors: Deju Zhu, Alva Peled, Barzin Mobasher
    Abstract:

    Dynamic tensile tests were conducted using a high speed Servo-Hydraulic Testing Machine on three types of fabric reinforced cement composites. A good correlation was found between the properties of the fabrics and the composites in high speed tensile tests. The carbon composite exhibits the highest strength, followed by the ARglass composite and then PE composite in high speed tensile tests. The cracking evolution and patterns of the composites were recorded by a high speed digital camera at a sampling rate of 10000 fps. Images showed that multiple cracking behavior was predominant for the carbon and glass fabric-cement composites, indicating good stress transfer within these systems. However, for the carbon, only the filaments at the bundle perimeter were bonded to the cement matrix as the inner filaments completely pulled out during loading. No multiple cracking was observed with PE fabric-cement composite as a single major crack was detected. This major crack opened and widened until the fabric was completely broken.

  • strain rate effect on the tensile behaviour of textile reinforced concrete under static and dynamic loading
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2011
    Co-Authors: Flavio De Andrade Silva, Marko Butler, Viktor Mechtcherine, Barzin Mobasher
    Abstract:

    This paper presents the results of an experimental investigation into the strength, deformation, and fracture behaviour of textile-reinforced concrete (TRC) subjected both to low and high-rate tensile loading ranging from 0.0001 to 50 s −1 . High strain rates were achieved using a high-rate Servo-Hydraulic Testing Machine. The effect of the addition of short fibres on the static and dynamic response of TRC has been investigated, and the microstructure of both composite and fibre was observed after the tests using an ESEM. An increase in tensile strength, strain capacity, and work-to-fracture was observed for strain rates up to 0.1 s −1 with increasing strain rate. The addition of short glass fibres increased the tensile strength and first crack strength of the TRC. For high-speed tests (rates above 5 s−1) an increase in the tensile strength, first crack strength and work-to-fracture was also observed, but at the same time there was a decrease in the strain capacity. The tests at high loading rates showed a pronounced effect of the specimen length on the measured mechanical properties: with increasing gauge length the tensile strength and strain capacity decreased, while the work-to-fracture increased. © 2010 Elsevier B.V. All rights reserved.

  • Dynamic tensile Testing of fabric–cement composites
    Construction and Building Materials, 2011
    Co-Authors: Deju Zhu, Alva Peled, Barzin Mobasher
    Abstract:

    Abstract Dynamic tensile tests were conducted using a high speed Servo-Hydraulic Testing Machine on three types of fabric reinforced cement composites. The high speed Testing procedure and data processing method are presented. Quasi-static tests were also conducted on the composites. Effects of strain rate on the mechanical properties of fabric–cement composites are noted. A good correlation was found between the properties of the fabrics and the composites, with the carbon fabric exhibiting the highest strength and ductility performance in high speed tensile tests. The differences in tensile behavior of the various composites were correlated with the differences in the role of the fabric materials. Composites tested under high speed loading exhibited different responses as compared to similar composites tested under quasi-static condition.

  • dynamic tensile Testing of fabric cement composites
    Construction and Building Materials, 2011
    Co-Authors: Deju Zhu, Alva Peled, Barzin Mobasher
    Abstract:

    Abstract Dynamic tensile tests were conducted using a high speed Servo-Hydraulic Testing Machine on three types of fabric reinforced cement composites. The high speed Testing procedure and data processing method are presented. Quasi-static tests were also conducted on the composites. Effects of strain rate on the mechanical properties of fabric–cement composites are noted. A good correlation was found between the properties of the fabrics and the composites, with the carbon fabric exhibiting the highest strength and ductility performance in high speed tensile tests. The differences in tensile behavior of the various composites were correlated with the differences in the role of the fabric materials. Composites tested under high speed loading exhibited different responses as compared to similar composites tested under quasi-static condition.

  • High speed tensile behavior of sisal fiber cement composites
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2010
    Co-Authors: Flavio De Andrade Silva, Deju Zhu, Chote Soranakom, Barzin Mobasher, Romildo Dias Toledo Filho
    Abstract:

    Abstract The experimental behavior of sisal fiber reinforced cement composites subjected to high speed tension load was studied. High strain rates were achieved by using a high rate Servo-Hydraulic Testing Machine. A state-of-the-art high speed Phantom camera was also used to take images from the specimen during the test. The images were used in a digital image correlation model to determine the displacement fields and to calculate crack spacing. The effect of strain rate was investigated by comparing static and dynamic tensile tests which were performed at strain rates ranging from 5.5 × 10 −6 to 24.6 s −1 , respectively. A numerical tension stiffening model based on nonlinear finite difference method was used to simulate tensile cracking behavior of sisal fiber cementitious composites. The composite presented strain rate sensitivity for ultimate tensile strength and strain capacity with a dynamic amplification factor of 1.26.

Isaac M Daniel - One of the best experts on this subject based on the ideXlab platform.

  • characterization and modeling of polymeric matrix under multi axial static and dynamic loading
    Composites Science and Technology, 2014
    Co-Authors: Brian T Werner, Isaac M Daniel
    Abstract:

    Abstract A polymeric matrix (3501-6) used in composite materials was characterized under multi-axial loading at strain rates varying from quasi-static to dynamic. Tests were conducted under uniaxial compression, tension, pure shear and combinations of normal and shear stresses. Quasi-static and intermediate strain rate tests were conducted in a Servo-Hydraulic Testing Machine. High strain rate tests were conducted using a split Hopkinson pressure bar (Kolsky bar) system made of glass/epoxy composite bars having an impedance compatible to that of the test polymer. The typical stress–strain behavior of the polymeric matrix exhibits a linear elastic region up to a yield point, a nonlinear elastic–plastic region up to an initial peak or “critical stress,” followed by strain softening up to a local minimum, plateau or saddle point stress, and finally, a strain hardening region up to ultimate failure. A general three-dimensional elastic–viscoplastic model, formulated in strain space, was developed. The model expresses the multi-axial state of stress in terms of an effective stress, incorporates strain rate effects and includes the large deformation region. Stress–strain curves obtained under multi-axial loading at different strain rates were used to develop and validate the new elastic–viscoplastic constitutive model. Excellent agreement was shown between model predictions and experimental results.

  • Strain-Rate-Dependent Failure of a Toughened Matrix Composite
    Experimental Mechanics, 2014
    Co-Authors: J. D. Schaefer, Brian T Werner, Isaac M Daniel
    Abstract:

    The strain-rate-dependent behavior of a toughened matrix composite (IM7/8552) was characterized under quasi-static and dynamic loading conditions. Unidirectional and off-axis composite specimens were tested at strain rates ranging from 10−4 to 103 s−1 using a Servo-Hydraulic Testing Machine and split Hopkinson pressure bar apparatus. The nonlinear response and failure were analyzed and evaluated based on classical failure criteria and the Northwestern (NU) failure theory. The predictive NU theory was shown to be in excellent agreement with experimental results and to accurately predict the strain-rate-dependent failure of the composite system based on measured average lamina properties.

  • Strain Rate Effects on Failure of a Toughened Matrix Composite
    Experimental Mechanics of Composite Hybrid and Multifunctional Materials Volume 6, 2013
    Co-Authors: J. D. Schaefer, B. T. Werner, Isaac M Daniel
    Abstract:

    The objective of this study was to characterize the quasi-static and dynamic behavior of a toughened matrix composite (IM7/8552) and apply the Northwestern (NU) failure theory to describe its strain-rate dependent failure under multi-axial states of stress. Unidirectional and off-axis experiments were conducted at two strain rates, quasi-static (10−4 s−1) and intermediate (~1s−1) using a Servo-Hydraulic Testing Machine. Stress–strain curves were obtained and the nonlinear response and failure were measured and evaluated based on classical failure criteria and the NU theory. Predicted failure envelopes were compared with experimental results. The NU theory was shown to be in excellent agreement with experimental data.

  • characterization of anisotropic polymeric foam under static and dynamic loading
    Experimental Mechanics, 2011
    Co-Authors: Isaac M Daniel
    Abstract:

    An orthotropic polymeric foam with transverse isotropy (Divinycell H250) used in composite sandwich structures was characterized at various strain rates. Uniaxial experiments were conducted along principal material axes as well as along off-axis directions under tension, compression, and shear to determine engineering constants, such as Young’s and shear moduli. Uniaxial strain experiments were conducted to determine mathematical stiffness constants, i. e., Cij. An optimum specimen aspect ratio for these tests was selected by means of finite element analysis. Quasi-static and intermediate strain rate tests were conducted in a Servo-Hydraulic Testing Machine. High strain rate tests were conducted using a split Hopkinson Pressure Bar system built for the purpose using polymeric (polycarbonate) bars. The polycarbonate material has an impedance that is closer to that of foam than metals and results in lower noise to signal ratios and longer loading pulses. It was determined by analysis and verified experimentally that the loading pulses applied, propagated along the polycarbonate rods at nearly constant phase velocity with very low attenuation and dispersion. Material properties of the foam were obtained at three strain rates, quasi-static (10−4 s−1), intermediate (1 s−1), and high (103 s−1) strain rates. A simple model proposed for the Young’s modulus of the foam was in very good agreement with the present and published experimental results.

Naruepon Eiamnipon - One of the best experts on this subject based on the ideXlab platform.

  • Experimental investigation on high strain rate tensile behaviors of steel cord-rubber composite
    Composite Structures, 2013
    Co-Authors: Naruepon Eiamnipon, Pongsak Nimdum, Jacques Renard, C. Kolitawong
    Abstract:

    High strain rate tensile tests of steel cord-rubber composite with different cord orientations have been performed on a Servo-Hydraulic Testing Machine. Two types of steel cord arrangement reinforcing to the same rubber material have been studied. Material properties and damage behaviors were identified. Damage mechanisms were studied for range of the strain rates going from 3.3 × 10−3 to 131 s−1. The effect of strain rate revealed tendencies of tensile fracture properties on the steel cord-rubber composites. The onset and the propagation of damage such as interfacial debonding were observed using high speed camera in order to understand damage mechanisms. The failure modes were found to be dependent on the cord orientations inducing particularly tensile fracture properties.

  • Experimental investigation on high strain rate tensile behaviors of steel cord–rubber composite
    Composite Structures, 2013
    Co-Authors: Naruepon Eiamnipon, Pongsak Nimdum, Jacques Renard, C. Kolitawong
    Abstract:

    Abstract High strain rate tensile tests of steel cord–rubber composite with different cord orientations have been performed on a Servo-Hydraulic Testing Machine. Two types of steel cord arrangement reinforcing to the same rubber material have been studied. Material properties and damage behaviors were identified. Damage mechanisms were studied for range of the strain rates going from 3.3 × 10 −3 to 131 s −1 . The effect of strain rate revealed tendencies of tensile fracture properties on the steel cord–rubber composites. The onset and the propagation of damage such as interfacial debonding were observed using high speed camera in order to understand damage mechanisms. The failure modes were found to be dependent on the cord orientations inducing particularly tensile fracture properties.

Jacques Renard - One of the best experts on this subject based on the ideXlab platform.

  • Experimental investigation on high strain rate tensile behaviors of steel cord-rubber composite
    Composite Structures, 2013
    Co-Authors: Naruepon Eiamnipon, Pongsak Nimdum, Jacques Renard, C. Kolitawong
    Abstract:

    High strain rate tensile tests of steel cord-rubber composite with different cord orientations have been performed on a Servo-Hydraulic Testing Machine. Two types of steel cord arrangement reinforcing to the same rubber material have been studied. Material properties and damage behaviors were identified. Damage mechanisms were studied for range of the strain rates going from 3.3 × 10−3 to 131 s−1. The effect of strain rate revealed tendencies of tensile fracture properties on the steel cord-rubber composites. The onset and the propagation of damage such as interfacial debonding were observed using high speed camera in order to understand damage mechanisms. The failure modes were found to be dependent on the cord orientations inducing particularly tensile fracture properties.

  • Experimental investigation on high strain rate tensile behaviors of steel cord–rubber composite
    Composite Structures, 2013
    Co-Authors: Naruepon Eiamnipon, Pongsak Nimdum, Jacques Renard, C. Kolitawong
    Abstract:

    Abstract High strain rate tensile tests of steel cord–rubber composite with different cord orientations have been performed on a Servo-Hydraulic Testing Machine. Two types of steel cord arrangement reinforcing to the same rubber material have been studied. Material properties and damage behaviors were identified. Damage mechanisms were studied for range of the strain rates going from 3.3 × 10 −3 to 131 s −1 . The effect of strain rate revealed tendencies of tensile fracture properties on the steel cord–rubber composites. The onset and the propagation of damage such as interfacial debonding were observed using high speed camera in order to understand damage mechanisms. The failure modes were found to be dependent on the cord orientations inducing particularly tensile fracture properties.