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Modeling Mechanical Behavior Of Multilayer Synthetic Fiber Ropes Under Axial Loading
, M.Sc. Thesis Sharif University of Technology ; Ghoreishi, Reza (Supervisor) ; Behzad, Mehdi (Supervisor)
Abstract
Synthetic fiber rope mooring systems, are increasingly finding applications as offshore oil exploration goes to deeper sites. Synthetic fiber cables provide numerous advantages over steel mooring lines, particularly in deeper water that large self-weight of steel lines is prohibitive, synthetic fiber ropes could be a good selection for mooring system. In order to reduce the need for expensive tests under varying parameters and operating conditions it is essential to be able to model the mechanical behavior of very long synthetic mooring lines. The purpose of modeling mechanical behavior of cables is to determine global stiffness matrix Coefficients to correlate the forces and strains for...
Damage evolution in Saffil alumina short-fibre reinforced aluminium during tensile testing
, Article Materials Science and Engineering A ; Volume 395, Issue 1-2 , 2005 , Pages 27-34 ; 09215093 (ISSN) ; Weber, L ; Mortensen, A ; Sharif University of Technology
2005
Abstract
The evolution of microstructural damage during tensile deformation of pure aluminium reinforced with 10 vol.% alumina short fibres is studied by monitoring the evolution of density and Young's modulus as a function of tensile strain. It is found that Young's modulus drops rapidly until a strain εc ≈ 3%. The composite density remains virtually unchanged in this strain range. At strains above εc, Young's modulus decreases more slowly while the density begins to decrease linearly, indicating void growth in the composite. It is shown that the drop in Young's modulus is linked to fragmentation of fibres aligned along the stress axis, while the decrease in density is related to void opening across...
The effect of water vapor on the performance of commercial polyphenylene oxide and Cardo-type polyimide hollow fiber membranes in CO2/CH4 separation applications
, Article Journal of Membrane Science ; Volume 285, Issue 1-2 , 2006 , Pages 265-271 ; 03767388 (ISSN) ; Soltanieh, M ; Matsuura, T ; Tabe Mohammadi, A ; Khulbe, K. C ; Sharif University of Technology
2006
Abstract
The effects of water vapor on CO2/CH4 separation using commercially available poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) and Cardo-type polyimide hollow fiber membranes were investigated. Pure methane and CO2/CH4 mixture permeation experiments were carried out in the absence and presence of water vapor (60% RH). Pure methane permeance decreased in the presence of water vapor for both membrane types. The decrease was 28% for hydrophilic Cardo-type polyimide and 6% for hydrophobic PPO membranes. The decline in the permeance was also observed for CO2/CH4 mixture separation through both membranes. However, selectivities of the two membranes were affected differently by water vapor. The...
Fiber bridging in polypropylene-reinforced high-strength concrete: An experimental and numerical survey
, Article Structural Concrete ; 2021 ; 14644177 (ISSN) ; Daneshyar, A ; Rezaei, B ; Fartash, A ; Sharif University of Technology
John Wiley and Sons Inc
2021
Abstract
Fracture process of fiber-reinforced concrete notched beams is investigated here. Polypropylene macrosynthetic fibers are utilized for reinforcing concrete specimens, and a high-strength mix design is used to produce strong bonds between the embossed polypropylene fibers and the cementitious matrix of beams. Considering different locations for the notch, this study focuses on bridging mechanism under different conditions using both experimental and numerical approaches. First mode of fracture occurs due to opening of crack faces. This mode of failure is simulated by imposing symmetric boundary conditions on middle-notched beams. Inducing the notch with an offset from the middle, mixed-mode...
Fiber bridging in polypropylene-reinforced high-strength concrete: An experimental and numerical survey
, Article Structural Concrete ; Volume 23, Issue 1 , 2022 , Pages 457-472 ; 14644177 (ISSN) ; Daneshyar, A ; Rezaei, B ; Fartash, A ; Sharif University of Technology
John Wiley and Sons Inc
2022
Abstract
Fracture process of fiber-reinforced concrete notched beams is investigated here. Polypropylene macrosynthetic fibers are utilized for reinforcing concrete specimens, and a high-strength mix design is used to produce strong bonds between the embossed polypropylene fibers and the cementitious matrix of beams. Considering different locations for the notch, this study focuses on bridging mechanism under different conditions using both experimental and numerical approaches. First mode of fracture occurs due to opening of crack faces. This mode of failure is simulated by imposing symmetric boundary conditions on middle-notched beams. Inducing the notch with an offset from the middle, mixed-mode...