scholarly journals The Use of a Non-conventional Fracture Mechanics Parameter for Estimating SN Curves of Welded Joints

2015 ◽  
Vol 9 ◽  
pp. 195-204 ◽  
Author(s):  
Jorge Alberto Rodriguez Duran ◽  
Alexandre Santos Francisco ◽  
Dionisio Jose Rodrigues da Costa
Keyword(s):  
Fracture Mechanics ◽  
Welded Joints

Fracture Mechanics Tests on Welded Joints

2009 ◽  
pp. 191-191-23 ◽  
Author(s):  
MG Dawes ◽  
HG Pisarski ◽  
SJ Squirrell
Keyword(s):  
Fracture Mechanics ◽  
Welded Joints

scholarly journals Fracture mechanics assessment of fatigue semi-elliptical cracks in butt-welded joints

2018 ◽  
Vol 26 (4) ◽  
pp. 568-576
Author(s):  
Edgar Hernández Laguna ◽  
Nelson Arzola de la Peña ◽  
Oscar Araque de los Ríos
Keyword(s):  
Fracture Mechanics ◽  
Welded Joints ◽  
Elliptical Cracks

OS1506 Fracture mechanics evaluation for fatigue properties of cross tension typed spot welded joints with artificial defect

2013 ◽  
Vol 2013 (0) ◽  
pp. _OS1506-1_-_OS1506-3_
Author(s):  
Ichiro OHARA ◽  
Naoto YAMAGUCHI ◽  
Ryota TANEGASHIMA ◽  
Hiroyuki AKEBONO ◽  
Masahiko KATO ◽  
...  
Keyword(s):  
Fracture Mechanics ◽  
Welded Joints ◽  
Fatigue Properties ◽  
Artificial Defect ◽  
Cross Tension ◽  
Spot Welded

scholarly journals A Fracture Mechanics-Based Optimal Fatigue Design Method of Under-Matched HSLA Steel Butt-Welded Joints with Imperfections

2019 ◽  
Vol 9 (17) ◽  
pp. 3609 ◽  
Author(s):  
Wen ◽  
Wang ◽  
Dong ◽  
Fang
Keyword(s):  
Fracture Mechanics ◽  
Welded Joints ◽  
Design Method ◽  
Hsla Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Engineering Structures ◽  
Fatigue Design ◽  
Load Carrying ◽  
Practical Engineering

The trend of light-weight structures leads to the wide application of high strength steels in engineering structures. When welding high strength steels, under-matched consumables could reduce the cold-cracking tendency, simplifying the preheating process. However, under-matched welds would sometimes make the high strength base metal pointless due to its weak load-carrying capacity. For the purpose of enhancing the fatigue strength of under-matched welded joints, a fracture mechanics-based optimal fatigue design method of under-matched butt-welded joints is proposed in this work. Heterogeneous mechanical features of welded joints, which are not considered in current standards and codes, are incorporated into the optimal design method. The fatigue limit of the high strength parent metal is taken as the design target, which has seldom been reported. HSLA steel Q550, with its under-matched consumable ER70S-6 composed X-shaped butt-welds, is selected for experimental verification. The experimental results indicate that the fracture mechanic based equal-fatigue-bearing-capacity (EFBC) design method established in this work is feasible and could be a valuable reference for the design of practical engineering structures.

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.

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