Fatigue life prediction method of concrete based on energy dissipation

Spot welding of dissimilar materials can utilize the respective advantage comprehensively, of which reliable prediction of fatigue life is the key issue in the structure design and service process. Taking into account almost all the complex factors that have effects on the fatigue behavior such as load level, thickness, welding nugget diameter, vibrational frequency, and material properties, this article proposed an energy dissipation-based method that is able to predict the fatigue life for spot-welded dissimilar materials rapidly. In order to obtain the temperature gradient, the temperature variations of four-group spot-welded joint of SUS301 L-DLT stainless steel and Q235 carbon steel during high-cycle fatigue tests were monitored by thermal infrared scanner. Specifically, temperature variation disciplines of specimen surface were divided into four stages: temperature increase, temperature decrease, continuous steady increase in temperature, and ultimate drop after the fracture. The material constant C that a spot-welded joint of dissimilar material needs to reach fracture is 0.05425°C·mm3. When the specimen was applied higher than the fatigue limit, the highest error between experimental values and predicted values is 18.90%, and others are lower than 10%. Therefore, a good agreement was achieved in fatigue life prediction between the new method and the validation test results.

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The application of a statistical fatigue life prediction method to agricultural equipment

International Journal of Fatigue ◽

10.1016/0142-1123(87)90053-3 ◽

1987 ◽

Vol 9 (2) ◽

pp. 115-118 ◽

Cited By ~ 5

Author(s):

B HARRAL

Keyword(s):

Fatigue Life ◽

Life Prediction ◽

Prediction Method ◽

Fatigue Life Prediction ◽

Agricultural Equipment

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Fatigue Life Prediction of Buckling String with Cracks in Horizontal Wells of Mining Engineering

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.577.127 ◽

2012 ◽

Vol 577 ◽

pp. 127-131 ◽

Cited By ~ 1

Author(s):

Peng Wang ◽

Tie Yan ◽

Xue Liang Bi ◽

Shi Hui Sun

Keyword(s):

Fatigue Life ◽

Prediction Model ◽

Life Prediction ◽

Horizontal Well ◽

Drill Pipe ◽

Prediction Method ◽

Drill String ◽

Fatigue Life Prediction ◽

Mining Engineering ◽

Life Prediction Model

Fatigue damage in the rotating drill pipe in the horizontal well of mining engineering is usually resulted from cyclic bending stresses caused by the rotation of the pipe especially when it is passing through curved sections or horizontal sections. This paper studies fatigue life prediction method of rotating drill pipe which is considering initial crack in horizontal well of mining engineering. Forman fatigue life prediction model which considering stress ratio is used to predict drill string fatigue life and the corresponding software has been written. The program can be used to calculate the stress of down hole assembly, can predict stress and alternating load in the process of rotating-on bottom. Therefore, establishing buckling string fatigue life prediction model with cracks can be a good reference to both operation and monitor of the drill pipe for mining engineering.

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