Experimental Study on the Compressive Behavior of Concrete Encased in CFRP Tubes

2010 ◽  
Vol 168-170 ◽  
pp. 1335-1341
Author(s):  
Wen Bin Sun
Keyword(s):  
Concrete Columns ◽  
Axial Direction ◽  
Compressive Behavior ◽  
Stress Strain ◽  
Strain Behavior ◽  
Corner Radius ◽  
Strain Relationship ◽  
Axial Compressive Strength ◽  
Frp Tube ◽  
Cfrp Tubes

Fiber reinforced polymer (FRP) tube-encased concrete columns represent a formwork-free, steel-free, and corrosion-resistant alternative for a construction of a new infrastructure. In this study, a total of nine square concrete columns with cross-section of 200mm×200mm and height of 600mm including six confined concrete encased in CFRP tubes and three unconfined concrete as control specimens are prepared. The tubes with fibers oriented at 90° from axial direction are manufactured to have 3 or 5 plies of CFRP with 10mm, 20mm, or 40mm rounding corner radius. To ensure proper bond, a 100mm overlap is provided in the direction of fibers. Uniaxial compressive tests are conducted to investigate the axial strength, compressive behavior, stress-strain relationship, and ductility of them throughout the loading history until the CFRP tubes rupture. It is evident that in all cases, the CFRP tube confinement can improve the behavior of unconfined concrete, in terms of axial compressive strength or axial deformability. Test results have shown that the stress-strain behavior of confined specimens vary with different confinement parameters, such as the level of confinement (3-ply and 5-ply), corner radius at vertical edges (10, 20 and 40 mm).

Experimental Study on the Axial Compression Behaviors of Short Rectangular Concrete Columns Encased in CFRP Tube

2011 ◽  
Vol 250-253 ◽  
pp. 370-373
Author(s):  
Wen Bin Sun
Keyword(s):  
Axial Compression ◽  
Concrete Columns ◽  
Compression Tests ◽  
Stress Strain ◽  
Concrete Core ◽  
Cfrp Sheets ◽  
Corner Radius ◽  
Cfrp Sheet ◽  
Axial Compressive Strength ◽  
Cfrp Tubes

In this study, 9 short rectangular concrete columns with cross-section 150mm×300mm and height 600mm are prepared, they are 6 confined concrete columns encased in CFRP tubes and three concrete columns as control specimens. The tubes with fibers oriented at hoop direction are manufactured to have 3 or 5 plies of CFRP sheet with 10mm, 20mm, or 40mm rounding corner radius. To ensure proper bond, a 100mm overlap is provided in the direction of fibers. Axial compression tests are conducted to investigate the axial strengths, compression behaviors, stress-strain relationships, and ductility until the CFRP tubes rupture. It is evident that the CFRP tube confinement can improve the behaviors of concrete core, in terms of axial compressive strength or axial deformability. Experimental results also show that the stress-strain behaviors of confined specimens vary with different the layers of CFRP sheets and corner radius at vertical edges.

Mechanical Properties of Kevlar® KM2 Single Fiber

2005 ◽  
Vol 127 (2) ◽  
pp. 197-203 ◽  
Author(s):  
Ming Cheng ◽  
Weinong Chen ◽  
Tusit Weerasooriya
Keyword(s):  
Isotropic Material ◽  
Axial Stress ◽  
Axial Loading ◽  
Strain Range ◽  
Transversely Isotropic ◽  
Axial Direction ◽  
Strain Response ◽  
Transversely Isotropic Material ◽  
Stress Strain ◽  
Strain Behavior

Kevlar® KM2 fiber is a transversely isotropic material. Its tensile stress-strain response in the axial direction is linear and elastic until failure. However, the overall deformation in the transverse directions is nonlinear and nonelastic, although it can be treated linearly and elastically in infinitesimal strain range. For a linear, elastic, and transversely isotropic material, five material constants are needed to describe its stress-strain response. In this paper, stress-strain behavior obtained from experiments on a single Kevlar KM2 fiber are presented and discussed. The effects of loading rate and the influence of axial loading on transverse and transverse loading on axial stress-strain responses are also discussed.

A Method to Resolve the Properties of Individual Phases in Carbon-Black-Loaded Elastomer Blends

1991 ◽  
Vol 64 (2) ◽  
pp. 234-242
Author(s):  
R. F. Bauer ◽  
A. H. Crossland
Keyword(s):  
Carbon Black ◽  
Large Deformation ◽  
Polymer Phase ◽  
Stress Strain ◽  
Strain Behavior ◽  
Stress Behavior ◽  
Strain Relationship ◽  
Deformation Stress ◽  
The Individual ◽  
Vulcanization Process

Abstract Properties of the individual phases in a 70/30 carbon-black-loaded BR/NR blend could be successfully resolved using large deformation stress-strain modelling. Since the dispersed NR phase of the example had a lower modulus than the continuous BR phase, the interaction between the blend phases could be modelled by a simple parallel coupling arrangement. The stress behavior of each individual carbon-black-loaded polymer phase was then determined with respect to strain using a specially derived stress-strain relationship. The blend components also have to be characterized with respect to state-of-cure by empirically establishing how the parameters in the stress-strain relationship vary with respect to cure. The properties of the phases in the blend are then determined by finding the combination of component parameters which precisely reproduce the stress-strain behavior of the blend. In the demonstration example of this paper, there was evidence of a significant amount of curative migration between phases during the vulcanization process.

Stress-strain behavior of concrete in circular concrete columns partially wrapped with FRP strips

2018 ◽  
Vol 200 ◽  
pp. 810-828 ◽  
Author(s):  
Jun-Jie Zeng ◽  
Yong-Chang Guo ◽  
Wan-Yang Gao ◽  
Wei-Peng Chen ◽  
Li-Juan Li
Keyword(s):  
Concrete Columns ◽  
Stress Strain ◽  
Strain Behavior ◽  
Frp Strips

Effect of corner radius on stress–strain behavior of FRP confined prisms under axial cyclic compression

2012 ◽  
Vol 40 ◽  
pp. 529-535 ◽  
Author(s):  
R. Abbasnia ◽  
F. Hosseinpour ◽  
M. Rostamian ◽  
H. Ziaadiny
Keyword(s):  
Stress Strain ◽  
Strain Behavior ◽  
Cyclic Compression ◽  
Corner Radius

Constitutive Modeling for Porous PLGA 85/15 Scaffold in Compression

2006 ◽  
Author(s):  
Linus Leung ◽  
Josee Perron ◽  
Hani E. Naguib
Keyword(s):  
Constitutive Model ◽  
Constitutive Modeling ◽  
Saturation Pressure ◽  
Mass Ratio ◽  
Compressive Behavior ◽  
Stress Strain ◽  
Salt Leaching ◽  
Strain Relationship ◽  
Relationship Of ◽  
Gas Foaming

Constitutive modeling of stress-strain relationship of open-celled PLGA 85/15 foams under compression was studied. A constitutive model for compressive behavior was directly derived from the morphology of a unit cubic cell. These constitutive equations describe the stress-strain relationship as a function of the foam's material properties and cell morphology, such as elastic modulus, yield stress, relative density, cell strut thickness, and cell size. To verify this model, uniaxial compression testing was performed on foam samples. Using the gas foaming/salt leaching method, the samples were prepared by using different foaming parameters such as salt/polymer mass ratio, saturation pressure, and saturation time. The comparisons of theoretical and experimental data demonstrate that the constitutive model using a cubic unit cell accurately describes the behavior of PLGA foams with low relative densities under compression.

Studies on the Stress-Strain Relationship Bovine Cortical Bone Based on Ramberg–Osgood Equation

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
N. K. Sharma ◽  
M. D. Sarker ◽  
Saman Naghieh ◽  
Daniel X. B. Chen
Keyword(s):  
Cortical Bone ◽  
Linear Regression Analysis ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Loading Conditions ◽  
Stress Strain ◽  
Strain Behavior ◽  
Nonlinear Stress ◽  
Strain Relationship ◽  
Relationship Of

Bone is a complex material that exhibits an amount of plasticity before bone fracture takes place, where the nonlinear relationship between stress and strain is of importance to understand the mechanism behind the fracture. This brief presents our study on the examination of the stress–strain relationship of bovine femoral cortical bone and the relationship representation by employing the Ramberg–Osgood (R–O) equation. Samples were taken and prepared from different locations (upper, middle, and lower) of bone diaphysis and were then subjected to the uniaxial tensile tests under longitudinal and transverse loading conditions, respectively. The stress–strain curves obtained from tests were analyzed via linear regression analysis based on the R–O equation. Our results illustrated that the R–O equation is appropriate to describe the nonlinear stress–strain behavior of cortical bone, while the values of equation parameters vary with the sample locations (upper, middle, and lower) and loading conditions (longitudinal and transverse).

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