Consistent model predictions for isothermal cure kinetics investigation of high performance epoxy prepregs

2007 ◽  
Vol 107 (4) ◽  
pp. 2231-2237 ◽  
Author(s):  
Jin Zhang ◽  
Bronwyn Fox ◽  
Qipeng Guo
Keyword(s):  
High Performance ◽  
Cure Kinetics ◽  
Isothermal Cure ◽  
Consistent Model ◽  
Model Predictions

High-performance bismaleimide matrices: cure kinetics and mechanism

2002 ◽  
Vol 13 (10-12) ◽  
pp. 837-844 ◽  
Author(s):  
Boris A. Rozenberg ◽  
Emma A. Dzhavadyan ◽  
Roger Morgan ◽  
Eugene Shin
Keyword(s):  
High Performance ◽  
Cure Kinetics ◽  
Kinetics And Mechanism

scholarly journals Non-isothermal cure kinetics of aerogel/epoxy composites using differential scanning calorimetry

2019 ◽  
Vol 58 (16) ◽  
pp. 1757-1765 ◽  
Author(s):  
Suryanarayanan Krishnaswamy ◽  
Veronica Marchante ◽  
Hrushikesh Abhyankar ◽  
Zhaorong Huang ◽  
James Brighton
Keyword(s):  
Differential Scanning Calorimetry ◽  
Cure Kinetics ◽  
Epoxy Composites ◽  
Scanning Calorimetry ◽  
Isothermal Cure ◽  
Kinetics Of

Cure kinetics of high performance epoxy resin systems

1991 ◽  
Vol 25 (6) ◽  
pp. 669-675 ◽  
Author(s):  
Jyong Sup Shim ◽  
Weon Lee ◽  
Jyongsik Jang
Keyword(s):  
Epoxy Resin ◽  
High Performance ◽  
Cure Kinetics ◽  
Kinetics Of

Test Results and Analytical Predictions for Rotor Drop Testing of an AMB Expander/Generator

2006 ◽  
Author(s):  
Lawrence Hawkins ◽  
Alexei Filatov ◽  
Shamim Imani ◽  
Darren Prosser
Keyword(s):  
High Speed ◽  
High Performance ◽  
Time History ◽  
Test Results ◽  
Direct Drive ◽  
Flow Loop ◽  
Low Loss ◽  
Model Predictions ◽  
Full Speed ◽  
Insight Into

A cryogenic gas expander system that incorporates a high performance, high-speed permanent magnet, direct-drive generator and low loss magnetic bearings is described. Flow loop testing to 30,000 rpm was completed at the system manufacturer’s facility in January 2005, and field installation is scheduled for October 2005. As part of the system testing, the rotor was dropped onto the backup bearings multiple times at an intermediate speed and at 30,000 rpm. Orbit and time-history data from a full speed drop and spin down are presented and discussed in detail. A transient, nonlinear rotordynamic analysis simulation model was developed for the machine to provide insight into the dynamic behavior. The model includes the dead band clearance, the flexible backup bearing support and hard stop. Model predictions are discussed relative to the test data.

Cure Kinetics of Neat and Nanophased Polyurethane Foams

2008 ◽  
Author(s):  
Sriram Mohan ◽  
Anandh Balakrishnan ◽  
Mrinal C. Saha
Keyword(s):  
Rate Constants ◽  
Preliminary Investigation ◽  
Cure Kinetics ◽  
Testing Procedure ◽  
Reaction Rates ◽  
Polyurethane Foams ◽  
Second Phase ◽  
Foam Sample ◽  
Isothermal Cure ◽  
Nanocomposite Foams

In this work, the isothermal cure behavior of a two part polyurethane foam system has been evaluated at temperatures between 25°C–80°C via a rheokinetic method. An ATD CSS 1000-Advanced Polymer Analyzer (APA) rheometer operating in torsion mode was used for this purpose. In the first phase of our work, neat polyurethane foams were investigated and the effects of cure temperature on the final cure modulus and density were documented. The testing procedure consisted of measuring G* as a function of time. The data obtained was fit to a generalized cure kinetics model to evaluate various parameters such as rate constants, reaction orders and activation energies. The rate constants as a function of temperature exhibited a straight line Arrhenius relationship. In the second phase of the work, 1% by weight of cloisite-15A nanoclay was used to manufacture nanocomposite foams. Isothermal cure tests were performed on the nanocomposite foam sample at 25°C. A preliminary investigation of the effect of nanoclay infusion on the final cure properties revealed no significant change. However the nanoclay foam sample exhibited higher reaction rates than its neat counterpart at the same temperature. The cell structures of these foams were studied using a JEOL 960 Scanning Electron Microscope. The micrographs supported the observations that neat foam samples showed an increased density and modulus at lower temperatures than at higher temperatures. The nanoclay sample also showed a higher density relative to its neat counterpart.

Isothermal cure kinetics and thermodynamics of an epoxy–nickel–diamine system

2006 ◽  
Vol 55 (3) ◽  
pp. 279-284 ◽  
Author(s):  
M Ghaemy ◽  
AA Rostami ◽  
A Omrani
Keyword(s):  
Cure Kinetics ◽  
Kinetics And Thermodynamics ◽  
Isothermal Cure

Long Term Performance of the SkyTrough Solar Concentrator

2012 ◽  
Author(s):  
David White ◽  
Alison Mason ◽  
Ryan Clark
Keyword(s):  
High Performance ◽  
Additional Data ◽  
Low Cost ◽  
Parabolic Trough ◽  
Optical Efficiency ◽  
Model Predictions ◽  
Electrical Generation ◽  
Long Term Performance ◽  
Term Performance

The SkyTrough is an advanced integrated parabolic trough concentrator designed for high performance and low cost to achieve economic objectives in the market for high grade heat for industrial processes and electrical generation. To achieve low cost, a comprehensive optimization process was carried out for every component based on the choice of low cost silvered polymer film as the reflector. To verify high performance, the optical efficiency of a single module was measured at the National Renewable Energy Lab (NREL), and a demonstration loop was constructed in December, 2009 at the SEGS-II solar power plant in Daggett, CA, USA. This paper compares operating data recorded over eighteen months for the commercial demonstration at the SEGS-II plant with model predictions based on the NREL efficiency measurement. The comparison demonstrates that the SkyTrough system will perform predictably over time. Additional data illustrating the good performance of the collector in wind, and the sustained reflectance of the mirror film, are presented.

scholarly journals An Improved Micromechanical Framework for Saturated Concrete Repaired by the Electrochemical Deposition Method considering the Imperfect Bonding

2016 ◽  
Vol 2016 ◽  
pp. 1-11
Author(s):  
Qing Chen ◽  
Zhengwu Jiang ◽  
Hehua Zhu ◽  
J. Woody Ju ◽  
Zhiguo Yan ◽  
...  
Keyword(s):  
Electrochemical Deposition ◽  
Effective Properties ◽  
Healing Process ◽  
Micromechanical Model ◽  
Deposition Method ◽  
Imperfect Bonding ◽  
Consistent Model ◽  
Electrochemical Deposition Method ◽  
Model Predictions ◽  
Saturated Concrete

The interfaces between the deposition products and concrete are not always well bonded when the electrochemical deposition method (EDM) is adopted to repair the deteriorated concrete. To theoretically illustrate the deposition healing process by micromechanics for saturated concrete considering the imperfect interfaces, an improved micromechanical framework with interfacial transition zone (ITZ) is proposed based on our recent studies. In this extension, the imperfect bonding is characterized by the ITZ, whose effects are calculated by modifying the generalized self-consistent model. Meanwhile, new multilevel homogenization schemes are employed to predict the effective properties of repaired concrete considering the ITZ effects. Moreover, modification procedures are presented to reach the properties of repaired concrete with ITZs in the dry state. To demonstrate the feasibility of the proposed micromechanical model, predictions obtained via the proposed micromechanical model are compared with those of the existing models and the experimental data, including results from extreme states during the EDM healing process. Finally, the influences of ITZ and deposition product on the healing effectiveness of EDM are discussed based on the proposed micromechanical model.

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