Steel bridges - numerical simulation of total service life including fracture mechanic concepts

2015 ◽  
Vol 8 (1) ◽  
pp. 28-32 ◽  
Author(s):  
Gerhard Lener
Keyword(s):  
Numerical Simulation ◽  
Service Life ◽  
Fracture Mechanic ◽  
Steel Bridges

Numerical Simulation of Hammer Forging Process for Inconel 718

2011 ◽  
Vol 383-390 ◽  
pp. 697-700 ◽  
Author(s):  
Hong Yan ◽  
Zhi Min Huang
Keyword(s):  
Numerical Simulation ◽  
Temperature Distribution ◽  
Service Life ◽  
Computer Simulations ◽  
Inconel 718 ◽  
Stress Evolution ◽  
Forging Process ◽  
Temperature Strain ◽  
Hammer Forging

The computer simulations during hammer forging process for Inconel 718 were conducted, and the temperature, strain and stress evolution were obtained and analyzed. Rebound takes place right after the ram goes up and this may have a significant effect on the temperature distribution and the reduction of friction. The simulated results can be helpful to predict further microstructure of forged product and the service life of the die.

Numerical Simulation Method for Predicting Chloride Concentration Distributing around Reinforcement in Concrete

2010 ◽  
Vol 163-167 ◽  
pp. 3138-3142
Author(s):  
Xian Li Wang ◽  
Guang Shu Ma ◽  
Chun Ling Qi
Keyword(s):  
Numerical Simulation ◽  
Service Life ◽  
Chloride Concentration ◽  
Mass Conservation ◽  
Simulation Method ◽  
Second Law ◽  
Exposed Surface ◽  
Rc Structures ◽  
Numerical Simulation Method ◽  
Section Shape

The reinforcement in concrete alters the pathway for chloride transporting and in turn causes the chloride concentration to accumulate faster near the reinforcement closest to the exposed surface. A mass conservation matrix equation under the non-stable diffusion based on the Fick’s second law was derived. Hereby, a numerical simulation method for predicting chloride concentration in concrete was established utilizing the compiled module based on FEA. The validity of the method was verified by the comparison with the analytical results. The proposed method has a wider applicability for predicting the service life of RC structures. And it can be applied flexibly to any complicated section shape of RC members with multi-boundary attacked by chloride and the reinforcement considered simultaneously.

Numerical Simulation of Flow-Induced Wall Shear Stress of a One Strand Tundish Design

2011 ◽  
Vol 402 ◽  
pp. 85-89 ◽  
Author(s):  
Zhi Bing Tian ◽  
Yan Jin ◽  
Hong Yu Li
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Shear Stress ◽  
Service Life ◽  
Wall Shear Stress ◽  
Design Parameters ◽  
Horizontal Distance ◽  
Wall Shear

In this paper, the flow-induced wall shear stress on the wall of a one Strand tundish has been computed by a 3-D mathematical model. Different design parameters of the tundish such as HB(the height of the dam) and DB(the horizontal distance between the dam and the outlet of the tundish) are studied by analyzing the flow-induced wall shear stress. After a series of calculation, A modification in design parameters (DB and HB )of the tundish can reduce the wall shear stress, thus may help to improve the service life of the tundish.

Analysis of Speed and Belt Deviation of the Conveyor Belt

2011 ◽  
Vol 339 ◽  
pp. 444-447
Author(s):  
Qiu Yi Chu ◽  
Guo Ying Meng ◽  
Xun Fan
Keyword(s):  
Numerical Simulation ◽  
Service Life ◽  
Theoretical Analysis ◽  
Mechanical Model ◽  
Rotation Speed ◽  
Conveyor Belt ◽  
Movement Speed ◽  
Belt Conveyor ◽  
Belt Speed ◽  
Great Harm

Deviated belt will cause great harm, which will not only reduce its service life, but also will lead to the machine damage and personal casualty. This paper analyzes the reasons for belt deviation and establishes the mechanical model of a conveyor belt. The theoretical analysis and numerical simulation are adopted in this article to analyze and research the speed when the belt is deviated, obtain the relation between the transversal movement speed of belt and front offset angle of a idler, idler rotation speed and belt speed, and provide the deviation correction and prevention of belt conveyor with theoretical guidance.

Corrosion Prevention for Extending the Service Life of Steel Bridges

2018 ◽  
Author(s):  
J. Peter Ault and Justin D. Dolph ◽  
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◽  
...  
Keyword(s):  
Service Life ◽  
Steel Bridges ◽  
Corrosion Prevention

I35W Bridge Collapse: Design Issues in Past and Challenges Revealed for Future

2010 ◽  
Author(s):  
Su Halo
Keyword(s):  
Service Life ◽  
Structural Design ◽  
Preliminary Analysis ◽  
Steel Bridges ◽  
Lessons Learned ◽  
Transportation Safety ◽  
Design Issues ◽  
The Past ◽  
Bridge Collapse ◽  
Safety Assessments

The past several decades can be remembered as the most successful period for engineering, which has also brought up great challenges to engineers to digest rapidly-developed ideas, new tools, and novel methodologies while to assure industrial designs and daily operations being safe, economic, and technologically advancing. This article discusses some particular issues in structural design, focused on the lessons learned from the highway I35W Bridge’s collapse that occurred at August 1st, 2007, based on a preliminary analysis of this disaster and an associated report submitted to the related administrative agencies [27]. By comparing the results in that report with the materials’ evidences of National Safety Transportation Safety Board (NTSB) official investigation [1,2] and the recent in-depth analyses [28,29], it seems that the issues addressed early may still have certain significance for the safety assessments of those similarly-structured steel bridges today. A bridge’s service life is 75 years or longer. According to a NTSB’s document [37], there are more than hundreds this kind of bridges still on service [4].

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