Prediction of fatigue life and its probability distribution of notched friction welded joints under variable-amplitude loading

2000 ◽  
Vol 22 (6) ◽  
pp. 481-494 ◽  
Author(s):  
J Yan
Keyword(s):  
Fatigue Life ◽  
Probability Distribution ◽  
Welded Joints ◽  
Variable Amplitude Loading ◽  
Variable Amplitude

Fatigue Life Prediction of Welded Joints for Offshore Structures Under Variable Amplitude Loading

1993 ◽  
Vol 115 (2) ◽  
pp. 123-130 ◽  
Author(s):  
R. Bell ◽  
O. Vosikovsky
Keyword(s):  
Fatigue Life ◽  
Welded Joints ◽  
Life Prediction ◽  
Experimental Tests ◽  
Offshore Structures ◽  
Multiple Cracks ◽  
Stress Range ◽  
Variable Amplitude Loading ◽  
Model Calculations ◽  
Variable Amplitude

This paper describes the development of a fracture mechanics model for the prediction of fatigue life of welded joints subjected to variable amplitude loading. The prediction program is based on the integration of the Paris equation. A novel feature of this program are relationships which account for the development, growth and coalescence of multiple cracks that occur at the weld toe. These relationships or forcing functions were developed from extensive monitoring of the initiation and crack shape development of multiple cracks during experimental tests. Data is also presented on a series of variable amplitude tests performed on welded T-plate joints loaded in 3-point bending using the common load sequence (COLOS) at a stress ratio of R=−1. These results are presented in terms of effective and root mean square stress ranges. The experimental data are used to validate the life prediction results from the growth model. A discussion is also included on the proportion of the compressive stress range to be included as an effective stress range in the prediction model calculations.

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