Research on Hydration Heat Temperature Stress of the Pier by Finite Element Method

2013 ◽  
Vol 353-356 ◽  
pp. 3649-3653
Author(s):  
Liang Zhao ◽  
Liang Liang Zhang ◽  
Zhi Yong Yang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Large Scale ◽  
Hydration Heat ◽  
Transient Temperature ◽  
Mass Concrete ◽  
External Temperature ◽  
Heat Temperature ◽  
Bridge Structures ◽  
Element Method

Hydration heat, one of the most severe factors, makes great effects on the mass concrete construction, especially on bridge structures and dam structures. Based on the experiment, this paper adopted large-scale finite element method with ANSYS software to analyze the transient temperature field during concrete placement. The atmosphere temperature, construction method, thermodynamics as well as material parameters (cement hydration heat, elastic modulus) were taken into account. The results clarity the distribution characters and process of the hydration heat temperature and stress. Besides, the computational and experimental results were compared. The results indicate that the surface cracks occur due to the large stress which is induced by the extensive internal and external temperature difference. As a result, references are provided to avoid harmful temperature cracks during pier construction period.

New Development of the P and H-P Version Finite Element Method with Quasi-Uniform Meshes for Elliptic Problems

2013 ◽  
Vol 444-445 ◽  
pp. 671-675
Author(s):  
Jian Ming Zhang ◽  
Yong He
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Automobile Industry ◽  
Large Scale ◽  
Elliptic Problems ◽  
Three Dimensions ◽  
The Finite Element Method ◽  
New Development ◽  
Engineering Problems ◽  
Element Method

In recent three decades, the finite element method (FEM) has rapidly developed as an important numerical method and used widely to solve large-scale scientific and engineering problems. In the fields of structural mechanics such as civil engineering , automobile industry and aerospace industry, the finite element method has successfully solved many engineering practical problems, and it has penetrated almost every field of today's sciences and engineering, such as material science, electricmagnetic fields, fluid dynamics, biology, etc. In this paper, we will overview and summarize the development of the p and h-p version finite element method, and introduce some recent new development and our newest research results of the p and h-p version finite element method with quasi-uniform meshes in three dimensions for elliptic problems.

Large-scale computational fluid dynamics by the finite element method

1994 ◽  
Vol 18 (11) ◽  
pp. 1083-1105 ◽  
Author(s):  
W. G. Habashi ◽  
M. Robichaud ◽  
V.-N. Nguyen ◽  
W. S. Ghaly ◽  
M. Fortin ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Finite Element Method ◽  
Computational Fluid Dynamics ◽  
Finite Element ◽  
Large Scale ◽  
The Finite Element Method ◽  
Element Method

FEA of Residual Stresses in Butt Welded Type Low Carbon Steel Using MMAW Technique

2011 ◽  
Vol 110-116 ◽  
pp. 2686-2692
Author(s):  
Gurinder Singh Brar ◽  
Gurdeep Singh
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Carbon Steel ◽  
Residual Stresses ◽  
Low Carbon Steel ◽  
Pressure Vessels ◽  
Transient Temperature ◽  
Low Carbon ◽  
Element Method

Welding is a reliable and efficient joining process in which the coalescence of metals is achieved by fusion. Welding is widely employed in diverse structures such as ships, aircraft, marine structures, bridges, ground vehicles, pipelines and pressure vessels. When two dissimilar plates are joined by welding process, a very complex thermal cycle is applied to the weldment, which further causes inhomogeneous plastic deformation and residual stress in and around fusion zone and heat affected zone (HAZ). Presence of residual stresses may be beneficial or harmful for the structural components depending on the nature and magnitude of residual stresses. In this study, a finite element analysis has been carried out to analyze the thermo-mechanical behaviour and effect of residual stress state in butt-welded in low carbon steel plates. A coupled thermal mechanical three dimension finite element model was developed. Finite element method based software SolidWorks Simulation, was then used to evaluate transient temperature and residual stress during butt welding of two plates. Plate thickness of 8 mm were used which are normally joined by multi-pass operation by Manual Metal Arc Welding (MMAW) process. During each pass, attained peak temperature and variation of residual stresses in plates has also been studied. The results obtained by finite element method agree well with those from X-ray diffraction method as published by Murugan et al. for the prediction of residual stresses.

Anisotropic Modeling with Geometric Multigrid Preconditioned Finite Element Method

Geophysics ◽  
2022 ◽  
pp. 1-21
Author(s):  
Qingtao Sun ◽  
Runren Zhang ◽  
Ke Chen ◽  
Naixing Feng ◽  
Yunyun Hu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Large Scale ◽  
Data Interpretation ◽  
Scale Modeling ◽  
Arbitrary Anisotropy ◽  
Large Scale Modeling ◽  
Element Method ◽  
Geometric Multigrid ◽  
Electromagnetic Surveys

Formation anisotropy in complicated geophysical environments can have a significant impact on data interpretation of electromagnetic surveys. To facilitate full 3D modeling of arbitrary anisotropy, we have adopted an h-version geometric multigrid preconditioned finite-element method based on vector basis functions. By using a structured mesh, instead of an unstructured one, our method can conveniently construct the restriction and prolongation operators for multigrid implementation, and then recursively coarsen the grid with the F-cycle coarsening scheme. The geometric multigrid method is used as a preconditioner for the biconjugate-gradient stabilized method to efficiently solve the linear system resulting from the finite-element method. Our method avoids the need of interpolation for arbitrary anisotropy modeling as in Yee’s grid-based finite-difference method, and it is also more capable of large-scale modeling with respect to the p-version geometric multigrid preconditioned finite-element method. A numerical example in geophysical well logging is included to demonstrate its numerical performance. Our h-version geometric multigrid preconditioned finite-element method is expected to help formation anisotropy characterization with electromagnetic surveys in complicated geophysical environments.

Temperature Distributions and Thermal Distortions of Brake Drums

1977 ◽  
Vol 191 (1) ◽  
pp. 169-176 ◽  
Author(s):  
R. J. Ashworth ◽  
M. El-Sherbiny ◽  
T. P. Newcomb
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Transient Temperature ◽  
Thermal Distortion ◽  
The Finite Element Method ◽  
Convective Cooling ◽  
Temperature Distributions ◽  
Manufacturing Tolerances ◽  
Complete Contact ◽  
Element Method

This paper presents calculated results of transient temperature distributions and the resulting drum distortions when band contact occurs between the rubbing surfaces during operation of a brake. The finite element method is used to compute the thermal distortion in drums when incomplete contact arising from previous distortion, manufacturing tolerances or shoe misalignment occurs. The results are compared with those obtained when there is complete contact between lining and drum. Both single and repeated brake applications made at regular intervals with convective cooling are considered.

Sign in / Sign up

Export Citation Format

Share Document