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Yu Bai

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Publications associées (46)

Employ a bisthienothiophene linker to construct an organic chromophore for efficient and stable dye-sensitized solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Yu Bai, Sophie Wenger, Peng Wang

We employed the bisthienothiophene conjugated linker along with a hydrophobic triphenylamine electron-donor and a hydrophilic cyanoacrylic acid electron-acceptor to construct a high molar extinction coefficient organic photosensitizer, exhibiting a power c ...

2009

Pultruded GFRP tubes with liquid cooling system under combined temperature and compressive loading

Thomas Keller, Yu Bai

An active fire protection system, liquid-cooling, was applied to pultruded GFRP tubes subjected to combined thermal and mechanical loading in order to maintain material temperature below the critical glass transition temperature. The use of an appropriate ...

2009

Delamination of pultruded glass fiber-reinforced polymer composites subjected to axial compression

Thomas Keller, Till Vallée, Yu Bai

Axial compression experiments were conducted on pultruded E-glass fiber-reinforced polymer laminates of different slenderness. Second-order deformations greatly increased the bending moments and shear forces of slender specimens. Delamination failure occur ...

2009

Modeling of strength degradation for fiber-reinforced polymer composites in fire

Thomas Keller, Yu Bai

A model for predicting composite material strength degradation under elevated and high temperatures is proposed. This model is based on the morphology of the mixture of materials in different states. The degradation of resin-dominated shear strength can be ...

2009

Material and structural performance of fiber-reinforced polymer composites at elevated and high temperatures

Yu Bai

As the range of applications for fiber-reinforced polymer (FRP) composite materials in civil engineering constantly increases, there is more and more concern with regard to their performance in critical environments. The fire behavior of composite material ...

EPFL2009

Modeling of mechanical response of FRP composites in fire

Thomas Keller, Yu Bai

A thermomechanical model is presented for predicting the time-dependent deflections of cellular FRP slab elements subjected to mechanical loading and fire from one side. The model comprises temperature-dependent mechanical property sub-models for the Young ...

2009

Shear failure of pultruded FRP composites under axial compression

Thomas Keller, Yu Bai

When structural elements are subjected to compressive loads, the shear forces and stresses induced by second- order effects may lead to shear failure prior to compressive failure. This is particularly likely to occur in the case of pultruded glass fiber-re ...

2009

Time dependence of material properties of FRP composites in fire

Thomas Keller, Yu Bai

Temperature dependence of physical and mechanical properties is considered in most thermal and mechanical response models for composite materials. Based on thermogravimetry analysis, differential scanning calorimetry, and dynamic mechanical analysis conduc ...

2009

Dye-sensitized solar cells with solvent-free ionic liquid electrolytes

Michael Graetzel, Shaik Mohammed Zakeeruddin, Yu Bai, Yiming Cao, Peng Wang

We systematically studied the temperature-dependent physicochemical properties, such as density, conductivity, and fluidity, of 1,3-dialkylimidazolium iodides. In combination with the amphiphilic Z907Na sensitizer, we have found that it is important to use ...

2008

High-performance dye-sensitized solar cells based on solvent-free electrolytes produced from eutectic melts

Michael Graetzel, Shaik Mohammed Zakeeruddin, Yu Bai, Mingkui Wang, Yiming Cao

2008

A kinetic model for predicting stiffness and strength of FRP composites in fire

Thomas Keller, Yu Bai

2008

Characterization of frequency-dependent glass transition temperature by Vogel-Fulcher relationship

Yu Bai, Li Jin

The complex mechanical modulus of polymer and polymer based composite materials showed a frequency-dependent behaviour during glass transition relaxation, which was historically modelled by the Arrhenius equation. However, this might not be true in a broad ...

2008

Experimental investigation on temperature-dependent thermo- physical and mechanical properties of pultruded GFRP composites

Thomas Keller, Yu Bai

The temperature-dependent thermo-physical and mechanical properties of a pultruded E-glass fiber-reinforced polyester (GFRP) composite are investigated in this paper. Fitting of theoretical models of the material properties to results of TGA, DSC, hot disk ...

2008

Modeling of thermo-mechanical properties and responses for FRP composites in fire

Thomas Keller, Till Vallée, Yu Bai

2008

New Connection System for Confined Concrete Columns and Beams. II: Theoretical Modeling

Yu Bai

The concept of confined concrete has been widely accepted throughout the structural engineering field, such as the spiral, steel tube, or carbon fiber composite shell confined concrete, etc. In the present study, this concept has not only been used in the ...

2008

Modal parameter identification for a GFRP pedestrian bridge

Thomas Keller, Yu Bai

Dynamic experiments were conducted on an all-FRP composite pedestrian bridge. The structure was excited by impact and human-induced vibrations. The peak-picking method and stochastic subspace identification method were used to extract structural dynamic ch ...

2008

New Connection System for Confined Concrete Columns and Beams. I: Experimental Study

Yu Bai

A new connection system for a concrete filled steel tube composite column and reinforced concrete beams is proposed. In this connection, the steel tube is interrupted while the reinforced concrete beams are continuous in the joint zone. Multiple lateral ho ...

2008

Modeling of stiffness properties of FRP composites under elevated and high temperatures

Thomas Keller, Till Vallée, Yu Bai

When subjected to elevated and high temperatures, the mechanical properties of FRP composites, such as the E- modulus and viscosity, experience significant changes. At a certain temperature, a composite material can be considered a mixture of materials tha ...

2008

Modeling of thermal responses for FRP composites under elevated and high temperatures

Thomas Keller, Till Vallée, Yu Bai

Based on temperature-dependent thermo-physical property models developed previously, a one-dimensional model was proposed to predict the thermal responses of FRP composites in time and space domain, up to high temperatures. An implicit finite differential ...

2008

Dynamic behavior of an all-FRP pedestrian bridge

Thomas Keller, Till Vallée, Yu Bai

2007

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