Experimental Analysis of HSLA Steel Welded Joint Fracture Behaviour

Milović, Ljubica; Sedmak, Aleksandar; Blačić, Ivo; Vuherer, Tomaž; Petrovski, B.

doi:10.1016/j.prostr.2022.12.190

Cited by 2 publications

(7 citation statements)

References 10 publications

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“…kor kor k (11) where: σ max(-1)kor , σ max(-1)-fatigue strengths of smooth specimens in the corrosive environment and in the air atmosphere, respectively. Fatigue strength in the corrosive environment depends on the number of cycles, but also on the length of exposure period of elements to the corrosive environment.…”

Section: Effect Of Stress Concentration and Corrosion On Fatigue Stre...mentioning

confidence: 99%

Presence of crack due the constant exploitation of turbine shaft

Bulatović,

Aleksić,

Zečević

et al. 2023

Adv.Tech&Mat.

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Designing, constructing and putting into operation a hydroelectric power plant includes complex tasks. Stresses of turbine and hydromechanical equipment of hydro power plants arise during the production of parts and assembly of equipment (residual stresses), in the process of performing functional requirements in exploitation and in the disturbed process of exploitation. After several decades of constant exploitation of the horizontal bulb turbine, which is an integral part of the hydroelectric power unit, empirically, the formation of a crack occurs in the turbine shaft due to the influence of corrosion, erosion and cavitation. Through experimental tests and calculations it has been determined that values of bending stresses of the turbine, which occur due to the action of fatigue and corrosion, as well as stress concentration, are bigger than 25 MPa for flanges exposed to water, and in other case bigger than 40 MPa for flanges exposed to `corrosive water` and can cause the occurrence of surface cracks on the transition radius between the cylindrical part of the shaft and the flange. It has been determined that stress values in the zone under the influence of bending stresses were bigger than allowable values, which led to the occurrence of many cracks due to fatigue corrosion. One of those cracks caused the failure of the shaft and of the whole turbine. Key words: crack, turbine shaft, fatigue, stress concentration

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Section: Effect Of Stress Concentration and Corrosion On Fatigue Stre...mentioning

confidence: 99%

Presence of crack due the constant exploitation of turbine shaft

Bulatović,

Aleksić,

Zečević

et al. 2023

Adv.Tech&Mat.

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show abstract

“…During cyclic loading, the crack can initiate from existing damage at maximum values of stress, well below quasi-static fracture toughness. The fatigue crack growth rate is defined as a function of the stress intensity factor range ∆K, according to Paris' law [3,5], also popularly known as the Paris-Erdogan equation. Paris' law is a crack growth equation that gives the rate of growth of a fatigue crack:…”

Section: Paris' Law Under Variable Loadingmentioning

confidence: 99%

“…Linear elastic fracture mechanics (LEFM) condition essentially deals with crack propagation in this region, which is commonly described by the crack growth equation proposed by Paris and Erdogan. The crack propagates fast to the final fracture, after reaching the critical stress intensity factor value K c (regime C) [3,7].…”

Section: Paris' Law Under Variable Loadingmentioning

confidence: 99%

“…Surface cracks, caused by imperfections in the welded joint, such as inclusions, overheating, corrosion damages, cracks in the fusion region, welder's markings are the most frequent defects in welded structures. Propagation of surface crack in the typical plot of crack growth rate presents a crucial problem, asking to consider also the cases after its initiation [3].…”

Section: Introductionmentioning

confidence: 99%

“…This approach has been adopted for the characterization of fatigue crack growth in the condition of small-scale plastic deformation at the crack tip. Linear elastic fracture mechanics (LEFM) has postulated that the stress intensity factor range, determined according to remote stress and the cracked component geometry unambiguously characterize fatigue crack growth, even when the fatigue fracture mechanism is not known [3].…”

Section: Introductionmentioning

confidence: 99%

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Application of Paris' law under variable loading

Bulatovic¹,

Aleksić²,

Milović³

et al. 2022

FME Transactions

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The most important characteristics for service safety of welded joints are those describing crack initiation and growth caused by variable loading. Crack initiation and growth caused by variable loading is the subject of numerous investigations. This paper shows the determination of parameters of the fatigue crack for constituents of welded joints produced of high strength low alloyed steel. The crack growth law of Paris establishes the relation between the applied variable load quantity or the corresponding stress intensity factor range and crack growth per cycle. Results have shown that the position of the notch and crack initiation affect the values of the stress intensity range of fatigue threshold DKth and parameters in the Paris' equation.

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Experimental Analysis of HSLA Steel Welded Joint Fracture Behaviour

Cited by 2 publications

References 10 publications

Presence of crack due the constant exploitation of turbine shaft

Presence of crack due the constant exploitation of turbine shaft

Application of Paris' law under variable loading

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