Rubber Joint for Fatigue Crack Factors Numerical Analysis of Certain Vehicle

2011 ◽  
Vol 66-68 ◽  
pp. 1505-1508 ◽  
Author(s):  
Sheng Wu Wang ◽  
Wei Da Wang ◽  
Dian Mai Zhou
Keyword(s):  
Fatigue Crack ◽  
Fatigue Strength ◽  
Numerical Analysis ◽  
Stress Concentration ◽  
Stress Field ◽  
Strain Field ◽  
Fe Simulation ◽  
Strain Concentration ◽  
Joint Design ◽  
Main Factor

The main factor of rubber fatigue was stress field. But the way is not sensitive in many cases. To clarify which factors were the main for predict the locations of fatigue crack, we analyzed the factors of stress field and strain field of rubber joint, and relations between the factors and the locations of fatigue crack, using 3D FE simulation. The result showed stress concentration was not sensitive to predict the locations of fatigue crack. The locations are close to strain concentration of rubber joint. In this paper we propose the approach of using strain concentration to predict the fatigue crack locations for rubber joint. This result is significant for the rubber joint design and the study of fatigue strength theoretic.

Numerical Analysis of a Crack Emanating from Semicircular Notch with Connection to a Pre-Existing Crack

2012 ◽  
Vol 428 ◽  
pp. 114-120
Author(s):  
Mohamed Sahnoun ◽  
Djamel Ouinas
Keyword(s):  
Finite Element Method ◽  
Stress Intensity Factor ◽  
Finite Element ◽  
Stress Intensity ◽  
Numerical Analysis ◽  
Stress Concentration ◽  
Intensity Factor ◽  
Stress Field ◽  
The Finite Element Method ◽  
Stress Concentrations

The real structures are of complex geometrical forms containing numerous zones of stress concentrations. These sites are characterized by weak sections due to the presence of notches which are the main causes of cracks initiation. The knowledge of the distribution of the stress field in the neighborhood of a notch is of an extreme importance for the analysis of the variation of the stress concentration factor with respect to the geometry of the notch. In this paper, the finite element method is used to study the effect of the existence of a microcrack on the behaviour of a notched structure. Then the behaviour of a crack emanating from the notch with the presence of the pre-existing crack is also investigated. It requires estimating the stress intensity factor at the crack tip, the length of the crack, the notch diameter and the angle between its bisecting line and the crack direction.

Effect of Temperature on Fatigue Strength Characteristic and Fatigue Mechanism in Laser Welded Dissimilar Stainless Steels Joint

2017 ◽  
Vol 754 ◽  
pp. 264-267
Author(s):  
Yukio Miyashita ◽  
Hideto Iraha ◽  
Yu Narita ◽  
Yuki Iizawa
Keyword(s):  
Stainless Steel ◽  
Fatigue Crack ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Strength Characteristic ◽  
Room Temperature ◽  
Base Material ◽  
Testing Temperature ◽  
Effect Of Temperature ◽  
Fatigue Mechanism

Fatigue strength characteristic of laser welded joint between austenitic stainless steel and ferritic stainless steel was studied at room temperature and 300 °C.The results showed that fatigue strength at 300°C was higher than that at room temperature in lower applied stress amplitude region. Fatigue crack mainly initiated at stress concentration part at room temperature. However, fatigue crack origin changed toward to the base material and the heat affected zone with increasing testing temperature. Increase in ductility of the base material and the weld metal induced by increasing testing temperature reduces stress concentration effect and resulted in change in fatigue mechanism. Appropriate weld position in a component with temperature gradient can be considered by minimizing the effect of stress concentration and taking into account degradation of strength due to increase in temperature.

Numerical Analysis of the Effect of Cope Hole on the Fatigue Strength of Corrugated Web Girders

2010 ◽  
Vol 452-453 ◽  
pp. 353-356 ◽  
Author(s):  
Z.Y. Wang ◽  
W.X. Ouyang ◽  
Q.Y. Wang ◽  
Y.Y. Chen ◽  
Rui Juan Jiang
Keyword(s):  
Fatigue Life ◽  
Fatigue Strength ◽  
Numerical Analysis ◽  
Stress Concentration ◽  
Stress Gradient ◽  
Parameter Variations ◽  
Corrugated Web ◽  
Cope Hole ◽  
Aashto Lrfd ◽  
Life Predictions

A common means of facilitating cross welding on the girder flange is to use cope hole on the girder web. This paper presents a study on the fatigue strength of the corrugated web girders with the cope hole using numerical analysis. Typical stress concentration behaviours are discussed relative to reported experimental results, and parameter variations are then used to study the stress gradient on the corrugated web as the influence of the cope hole. Based on the simplified cumulative fatigue summation implemented in fatigue post-processor, fatigue life predictions are presented with codified curves of AASHTO LRFD.

Development of Structural Steel With High Resistance to Fatigue Crack Initiation and Growth: Part 3

2005 ◽  
Author(s):  
Hiroshi Katsumoto ◽  
Noboru Konda ◽  
Kazushige Arimochi ◽  
Kazuhiro Hirota ◽  
Atsushi Isoda ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Crack Initiation ◽  
Fatigue Fracture ◽  
High Resistance ◽  
Fatigue Crack Initiation ◽  
Conventional Steel ◽  
Welded Structure ◽  
Safety And Reliability

In recent years, higher safety and reliability of steel welded structures have been required as it shows growing concern about environmental problems. To prevent fatigue fracture is one of the most important challenges to improve the safety and reliability. A lot of studies how reduce stress concentration at critical areas have been carried out from the viewpoint of structural design as prevention measures while nothing has been studied from the viewpoint of material because fatigue strength of welded joints converges in limited range regardless of material strength. On the other hand, it was found that an appropriate dual phase microstructure could reduce the fatigue crack growth rate remarkably. The newly developed steel plate with high resistance to fatigue crack growth could extend the fatigue life of structures. The developed steels have already been applied to some ships and vessels, and a new bulk carrier applied the developed steels acquired the notation and descriptive note as the valuable ship with resistance to fatigue fracture by Nippon Kaiji Kyokai for the first time in the world. From further studies, it was found the developed steels had also high resistance to fatigue crack initiation as well as the growth even in welded structure. In this study, it was clarified that the fatigue strength of HAZ, where fatigue crack generally initiates, in the developed steel was higher than that in conventional steel and the stress concentration at toe of weld in the developed steel was smaller than in the conventional steel. It was considered the mechanism of suppression of fatigue crack initiation with FEM analysis and fatigue test. The newly developed steel can effectively extend fatigue fracture life of welded structure from the viewpoint of material.

scholarly journals Improving Fatigue Strength of Butt Welded Joints by Laser Peening and Its Main Factor

2011 ◽  
Vol 29 (3) ◽  
pp. 146-153 ◽  
Author(s):  
Yoshihiro SAKINO ◽  
Yuji SANO ◽  
Rie SUMIYA ◽  
You-Chul KIM
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
Laser Peening ◽  
Main Factor

scholarly journals Structural and mechanical defects of materials of offshore and onshore main gas pipelines after long-term operation

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Pavlo Maruschak ◽  
Sergey Panin ◽  
Iryna Danyliuk ◽  
Lyubomyr Poberezhnyi ◽  
Taras Pyrig ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Quantitative Analysis ◽  
Stress Concentration ◽  
Cyclic Loading ◽  
Fatigue Cracks ◽  
Preliminary Deformation ◽  
Term Operation ◽  
Steel Pipes

AbstractThe study has established the main regularities of a fatigue failure of offshore gas steel pipes installed using S-lay and J-lay methods.We have numerically analyzed the influence of preliminary deformation on the fatigue life of 09Mn2Si steel at different amplitudes of cyclic loading. The results have revealed the regularities of formation and development of a fatigue crack in 17Mn1Si steel after 40 years of underground operation. The quantitative analysis describes the regularities of occurrence and growth of fatigue cracks in the presence of a stress concentration.

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