Characterizing load transfer efficiency in double-walled carbon nanotubes using multiscale finite element modeling

2013 ◽  
Vol 44 (1) ◽  
pp. 394-402 ◽  
Author(s):  
Ting-Chu Lu ◽  
Jia-Lin Tsai
Keyword(s):  
Carbon Nanotubes ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Load Transfer ◽  
Transfer Efficiency ◽  
Element Modeling ◽  
Multiscale Finite Element ◽  
Load Transfer Efficiency ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Validation of Three-Dimensional Finite Element Modeling Technique for Joints in Concrete Airport Pavements

1998 ◽  
Vol 1629 (1) ◽  
pp. 67-75 ◽  
Author(s):  
Michael I. Hammons
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
3D Modeling ◽  
Load Transfer ◽  
Three Dimensional ◽  
Transfer Efficiency ◽  
Element Modeling ◽  
Transfer Capability ◽  
Base Course ◽  
Load Transfer Efficiency

A rational, three-dimensional (3D) finite element modeling technique was developed to predict the structural response of a jointed concrete airport pavement system. Model features include explicit 3D modeling of the slab continua, load transfer capability at the joint, explicit 3D modeling of the base course continua, load transfer capability across the cracks in the base course, and contact interaction between the slabs and base course. Environmental effects were not explicitly included in the model development. The model was applied to predict the response of an instrumented pavement at the Denver International Airport (DIA) to a test vehicle driven over the instrumented pavement under day and night conditions. The DIA pavement was modeled as a three-layer system with the presence of cracking in the base course as well as a variety of interface conditions between the slabs and base course considered. Complex response patterns caused by environmental factors were observed in the data from DIA, making separation of load-induced and environmentally induced response difficult. The general shape and form of the deflection- and stress-based load transfer efficiency predictions from the finite element models match those observed at DIA. Model predictions of stress-based load transfer efficiencies were generally more accurate than predictions of deflection-based load transfer efficiency. The model developed represents a significant advancement in the state of the art and features innovations that are compatible with the FAA’s advanced pavement design model requirements.

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