Spectrum Fatigue Life Assessment of Notched Specimens Using a Fracture Mechanics Based Approach

2009 ◽  
pp. 221-221-20 ◽  
Author(s):  
M Vormwald ◽  
P Heuler ◽  
C Krae
Keyword(s):  
Fatigue Life ◽  
Fracture Mechanics ◽  
Life Assessment ◽  
Notched Specimens ◽  
Fatigue Life Assessment

Fatigue life assessment of welded structures based on fracture mechanics

2015 ◽  
Vol 6 (1) ◽  
pp. 2-25
Author(s):  
A. Krasovskyy ◽  
A. Virta
Keyword(s):  
Fatigue Life ◽  
Fracture Mechanics ◽  
Welded Joints ◽  
Welding Process ◽  
Life Assessment ◽  
Lifetime Estimation ◽  
Worst Case ◽  
Welded Structures ◽  
Content Type ◽  
Fatigue Life Assessment

Purpose – Even though modern welding technology has improved, initial defects on weld notches cannot be avoided. Assuming the existence of crack-like flaws after the welding process, the stage of a fatigue crack nucleation becomes insignificant and the threshold for the initial crack propagation can be used as a criterion for very high cycle fatigue whereas crack growth analysis can be applied for the lifetime estimation at lower number of cycles. The purpose of this paper is to present a mechanism based approach for lifetime estimation of welded joints, subjected to a multiaxial non-proportional loading. Design/methodology/approach – The proposed method, which is based on the welding process simulation, thermophysical material modeling and fracture mechanics, considers the most important aspects for fatigue of welds. Applying worst-case assumptions, fatigue limits derived by the weight function method can be then used for the fatigue assessment of complex welded structures. Findings – An accurate mechanism based method for the fatigue life assessment of welded joints has been presented and validated. Originality/value – Compared to the fatigue limits provided by design codes, the proposed method offers more accurate lifetime estimation, a better understanding of interactions between welding process and fatigue behavior. It gives more possibilities to optimize the welding process specifically for the considered material, weld type and loading in order to achieve the full cost and weight optimization potential for industrial applications.

A Study on Fatigue Crack Growth Parameters for Fatigue Life Assessment based on Fracture Mechanics

2017 ◽  
Vol 35 (1) ◽  
pp. 61-67
Author(s):  
Hyeon-Su Kim ◽  
Tae-Jong Park ◽  
Dong-Ju Lee ◽  
Sang-Beom Shin ◽  
Myung-Hyun Kim
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Fatigue Crack Growth ◽  
Fracture Mechanics ◽  
Crack Growth ◽  
Growth Parameters ◽  
Life Assessment ◽  
Fatigue Life Assessment
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