Investigation on the effect of geometric and structural notch on the fatigue notch factor in steel welded joints

Łagoda, Tadeusz; Biłous, Paweł; Blacha, Łukasz

doi:10.1016/j.ijfatigue.2016.09.006

Cited by 10 publications

(4 citation statements)

References 22 publications

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“…Also, notch sensitivity of Al 2024 alloys under these two heat treatments conditions were compared. It is notable that, up to our literature review [19,30,31], the effect of V-notch, which has the most stress concentration on alteration the micro mechanisms of fracture were not studied in detail. Thus it is interesting to demonstrate the consequence of stress concentration factor on fracture behavior under different types of artificial age hardening as T6 and T8 treatments.…”

Section: Introductionmentioning

confidence: 97%

Ageing condition of tensile specimens: fracture behavior of notched Al2024 sheet under tensile loading

Pakravan

Monazzah

Farahmand

2020

Mater. Res. Express

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The effect of different (T6 and T8) heat treatments on tensile properties and fracture behavior of Al2024 in presence and absence of notch by means of microhardness, tensile tests and scanning electron microscopy were investigated. Tensile and hardness specimens were subjected to two different artificial ageing (T6 and T8 heat treatment) for various times. These included under ageing (UA), peak ageing (PA) and over ageing (OA). T8 heat treatment, which has a cold rolling between solutionizing and ageing in its steps, showed a higher value of hardness and yield strength in comparison with common artificial ageing of T6 heat treatment. In notched-tensile specimens, yield stress was found to increase up to the peak ageing condition with a simultaneously decrease in elongation at fracture. This behavior was converse at OA condition. Although introducing of notch increase the yield stress of samples under T6 and T8 conditions in comparison with un-notched samples, the notch strengthening phenomenon was observed only under T8 treatment. Despite of an enhancement in strengthening by applying notch on tensile samples, the elongation to failure was notably lessen in both notched-heat treated samples in comparison with unnotches ones. Also, it was confirmed that the toughness of notched samples of both heat treatments at PA condition were significantly lower than un-notched ones. Consequently, toughness decrement was considerably dominated by the role of deformability compared to strengthening factor, however, the presence of cold rolling in the process of heat treatment (T8) could reduce the harmful effects of notch by increasing the stress bearing capacity in contrary with T6 heat treatment. Moreover, inserting the mechanical properties of peak aged samples from the un-notched tensile test in Abaqus finite element software; the V-shaped notch tensile test was simulated and confirmed the experimental results. It was shown in SEM results that the presence of notch enhanced the contribution of cracked particles, compared to particle/matrix deboning and matrix deformation, therefore, the non-homogeneous distribution of fracture features confirmed the harmful effect of notch. In the following, the distribution of three fracture micro-mechanisms were homogeneous in un-notched samples, which demonstrated the superior values of toughness in smooth samples. The present finding sheds light on development of processing techniques to optimize the mechanical properties of Al 2024 alloy.

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Section: Introductionmentioning

confidence: 97%

Ageing condition of tensile specimens: fracture behavior of notched Al2024 sheet under tensile loading

Pakravan

Monazzah

Farahmand

2020

Mater. Res. Express

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Section: Introductionmentioning

confidence: 99%

“…Reference [3] has analyzed the fatigue of complex notch that established from welded joints. Welded joint for industries purpose such as offshore, oil and gas, and the building is used as a joint between the structural member to provide safety and stability of the construction [3]. Reference [4] has clarified the tensile residual stresses from the welding activity for steel assemblies is combined with initial stress from steel component is lead to crack initiation.…”

Section: Introductionmentioning

confidence: 99%

Testing and Analysis of Cold-Formed Steel Channel Section With Notch

Sani¹

2018

GEOMATE

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Cold-formed steel (CFS) channel section is a construction material that often been used in the building and still in the research for utilizing in structural element. The advantages of the CFS channel section such as lightweight, anti-corrosion and etc are becoming so interesting in selecting it as a roof purlin, roof truss system and storage rack. For having the structural element with the strong, safe and stable condition, the study of the CFS with the notch is carried out to determine the behavior. The parametric study is taking place to determine the suitability of notch pattern whether the notch depth and spacing are affecting the ultimate load of the CFS channel section column and beam. The study of the CFS channel section is divided into two parts, the first part is to examine the ultimate load of the column in varies of notch depth and the second part is to determine the ultimate load of the beam in varies of notch spacing. By referring the study of the notch depth on CFS channel column section, the result of the ultimate load is obtained to have the reduction about 19-80% of the variation of notch depth when compared with the normal section. Although, the CFS channel beam section with variation notch depth is influenced by approximately 4-14% when compared with CFS channel normal beam section.

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“…In case of the welded bridges and welded structures in general, the fatigue failures are caused and can be estimated by the stress cycles accumulated over time, by the internal stress concentrators such as the type of macro-structural defects that extend over time (pore, cracks, etc.) but in the greatest extent by the external stress concentrators determined by the convex geometric shape of the welding seams [7][8][9][10][11][12][13][14][15][16][17][18][19]. In the past, the convex geometry of the welding seams was believed to provide better mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

The Environmental Impact of Ecological Rehabilitation Techniques Applied to Statically and Variably Stressed Welded Structures

et al. 2018

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There are many welded structures in the world such as bridges and viaducts that are subject to fatigue. Some of these structures, generally made of non-alloy or low-alloy steels, have been put into operation many years ago and have accumulated a large number of variable load cycles over time. For this reason, the occurrence of the fatigue phenomenon is inevitable and consists in the occurrence of failures at stresses applied to the structure, below the yield limit of the material. These stresses under the static loads would not cause the failures to appear. This paper will investigate if the ecological reconditioning techniques “weld toe grinding” and “WIG re-melting weld toe,” influence favourably the behaviour of the welded structures made from HSLA steel, in static and variable loads, if the application of these techniques is justified in both cases and finally which is the environmental impact of applying these techniques. In the paper we will present the chemical composition and mechanical properties of the base and filler materials, micro and macrostructures, graphics with the variation of the micro-hardness, we will perform static and fatigue tensile tests and we will rise the durability curve in the case of the fatigue tests. We will also present a mathematical computational algorithm, which highlights the extent to which these ecological rehabilitation techniques pollute the environment. It is more efficient both for technological and ecological reasons to recondition a product than to manufacture it from the very beginning.

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Investigation on the effect of geometric and structural notch on the fatigue notch factor in steel welded joints

Cited by 10 publications

References 22 publications

Ageing condition of tensile specimens: fracture behavior of notched Al2024 sheet under tensile loading

Ageing condition of tensile specimens: fracture behavior of notched Al2024 sheet under tensile loading

Testing and Analysis of Cold-Formed Steel Channel Section With Notch

The Environmental Impact of Ecological Rehabilitation Techniques Applied to Statically and Variably Stressed Welded Structures

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