The Experts below are selected from a list of 6342 Experts worldwide ranked by ideXlab platform

Sankaran Mahadevan - One of the best experts on this subject based on the ideXlab platform.

  • chloride induced reinforcement corrosion and concrete cracking simulation
    Cement & Concrete Composites, 2008
    Co-Authors: Dong Chen, Sankaran Mahadevan
    Abstract:

    Abstract This paper develops an integrated computational methodology for chloride-induced degradation assessment of reinforced concrete structures by considering all three phases of the deterioration process. The chloride penetration process is simulated using a finite element-based method by following an analogous transient thermal analysis. A reinforcement corrosion and rust expansion model based on Faraday’s law is developed, and the rust expansion is characterized by an equivalent time-varying radial Displacement Boundary Condition. Two established corrosion rate models – the constant model and the dynamic model – are included in the rust expansion model. Finite element analysis with a smeared cracking approach is implemented to simulate the rust expansion and the associated concrete cracking process. Simulation results are presented for a reinforced concrete slab exposed to a constant chloride environment.

Dong Chen - One of the best experts on this subject based on the ideXlab platform.

  • chloride induced reinforcement corrosion and concrete cracking simulation
    Cement & Concrete Composites, 2008
    Co-Authors: Dong Chen, Sankaran Mahadevan
    Abstract:

    Abstract This paper develops an integrated computational methodology for chloride-induced degradation assessment of reinforced concrete structures by considering all three phases of the deterioration process. The chloride penetration process is simulated using a finite element-based method by following an analogous transient thermal analysis. A reinforcement corrosion and rust expansion model based on Faraday’s law is developed, and the rust expansion is characterized by an equivalent time-varying radial Displacement Boundary Condition. Two established corrosion rate models – the constant model and the dynamic model – are included in the rust expansion model. Finite element analysis with a smeared cracking approach is implemented to simulate the rust expansion and the associated concrete cracking process. Simulation results are presented for a reinforced concrete slab exposed to a constant chloride environment.

Marco Viceconti - One of the best experts on this subject based on the ideXlab platform.

  • micro ct based finite element models of cancellous bone predict accurately Displacement once the Boundary Condition is well replicated a validation study
    Journal of The Mechanical Behavior of Biomedical Materials, 2017
    Co-Authors: Yuan Chen, Enrico Dall Ara, E Sales, Krishnagoud Manda, R J Wallace, Pankaj Pankaj, Marco Viceconti
    Abstract:

    Non-destructive 3D micro-computed tomography (microCT) based finite element (microFE) models are used to estimate bone mechanical properties at tissue level. However, their validation remains challenging. Recent improvements in the quantification of Displacements in bone tissue biopsies subjected to staged compression, using refined Digital Volume Correlation (DVC) techniques, now provide a full field Displacement information accurate enough to be used for microFE validation. In this study, three specimens (two humans and one bovine) were tested with two different experimental set-ups, and the resulting data processed with the same DVC algorithm. The resulting Displacement vector field was compared to that predicted by microFE models solved with three different Boundary Conditions (BC): nominal force resultant, nominal Displacement resultant, distributed Displacement. The first two Conditions were obtained directly from the measurements provided by the experimental jigs, whereas in the third case the Displacement field measured by the DVC in the top and bottom layer of the specimen was applied. Results show excellent relationship between the numerical predictions (x) and the experiments (y) when using BC derived from the DVC measurements (UX: y=1.07x-0.002, RMSE: 0.001mm; UY: y=1.03x-0.001, RMSE: 0.001mm; UZ: y=x+0.0002, RMSE: 0.001 mm for bovine specimen), whereas only poor correlation was found using BCs according to experiment set-ups. In conclusion, microFE models were found to predict accurately the vectorial Displacement field using interpolated Displacement Boundary Condition from DVC measurement.

Yuan Chen - One of the best experts on this subject based on the ideXlab platform.

  • micro ct based finite element models of cancellous bone predict accurately Displacement once the Boundary Condition is well replicated a validation study
    Journal of The Mechanical Behavior of Biomedical Materials, 2017
    Co-Authors: Yuan Chen, Enrico Dall Ara, E Sales, Krishnagoud Manda, R J Wallace, Pankaj Pankaj, Marco Viceconti
    Abstract:

    Non-destructive 3D micro-computed tomography (microCT) based finite element (microFE) models are used to estimate bone mechanical properties at tissue level. However, their validation remains challenging. Recent improvements in the quantification of Displacements in bone tissue biopsies subjected to staged compression, using refined Digital Volume Correlation (DVC) techniques, now provide a full field Displacement information accurate enough to be used for microFE validation. In this study, three specimens (two humans and one bovine) were tested with two different experimental set-ups, and the resulting data processed with the same DVC algorithm. The resulting Displacement vector field was compared to that predicted by microFE models solved with three different Boundary Conditions (BC): nominal force resultant, nominal Displacement resultant, distributed Displacement. The first two Conditions were obtained directly from the measurements provided by the experimental jigs, whereas in the third case the Displacement field measured by the DVC in the top and bottom layer of the specimen was applied. Results show excellent relationship between the numerical predictions (x) and the experiments (y) when using BC derived from the DVC measurements (UX: y=1.07x-0.002, RMSE: 0.001mm; UY: y=1.03x-0.001, RMSE: 0.001mm; UZ: y=x+0.0002, RMSE: 0.001 mm for bovine specimen), whereas only poor correlation was found using BCs according to experiment set-ups. In conclusion, microFE models were found to predict accurately the vectorial Displacement field using interpolated Displacement Boundary Condition from DVC measurement.

S M Nabavi - One of the best experts on this subject based on the ideXlab platform.

  • analytical solution of the quasi static thermoelasticity problem in a pressurized thick walled cylinder subjected to transient thermal loading
    Applied Mathematical Modelling, 2007
    Co-Authors: A R Shahani, S M Nabavi
    Abstract:

    Abstract Thermoelasticity problem in a thick-walled cylinder is solved analytically using the finite Hankel transform. Time-dependent thermal Boundary Conditions are assumed to act on the inner surface of the cylinder. For the mechanical Boundary Conditions two different cases are assumed: Traction–Displacement problem (traction is prescribed on the inner surface and the fixed Displacement Boundary Condition on the outer one) and Traction–Traction problem (tractions are prescribed on both the inner and outer surfaces of the hollow cylinder). The quasi-static solution of the thermoelasticity problem is derived analytically, i.e., the transient thermal response of the cylinder is derived and then, quasi-static structural problem is solved and closed form relations are extracted for the thermal stresses in the two problems. The results show to be in accordance with that cited in the literature in the special cases.