Computational Methods for Lifetime Prediction of Metallic Components under High-Temperature Fatigue

Kindrachuk, Vitaliy M.; Fedelich, Bernard; Rehmer, Birgit; Peter, Frauke

doi:10.3390/met9040390

Cited by 7 publications

(2 citation statements)

References 73 publications

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“…At present, there are two common methodologies for fatigue life prediction of welded structures. One is the S-N curve methodology which is based on the welded joints categories [31][32][33]. Fatigue life is predicted in terms of various characteristic stress such as nominal stress, hot spot stress, equivalent structural stress, notched stress, peak stress, etc.…”

Section: Conventional Approaches To Predicting Life For Welded Jointsmentioning

confidence: 99%

Analysis of the Fatigue Crack Evolution of Corrugated Web Girders

Wei

et al. 2019

Metals

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Based on linear elastic fracture mechanics (LEFM), the fatigue crack evolution process and behavior of corrugated web girders were studied. The global finite element analysis (FEA) model of corrugated web girders was first developed and the equivalent structural stress method was used to reveal the dangerous locations along the weld under the bending load. The weld toe between the tension flange and the web weld, which is near the intersection of the inclined fold and the parallel fold, was determined as the fatigue crack easy-initiating location. Then a small region containing the crack-prone site was extracted as the sub-model for a crack propagating simulation. A semi-circle initial crack with 0.1 mm radius was inserted at the crack easy-initiating location. The stress intensity factors (SIFs; K I , K II , and K III ) of some discrete points along the crack front were calculated by the M-integral method. Based on Nasgro law, the geometry of the new crack front with a given extension length was obtained. Finally, the complete evolution process of the crack propagation was simulated. Results showed that the dominant crack propagating mode is open type (Mode I) and K I is the most important propagating driving force. According to the crack front shape evolution, the whole propagating process was divided into 6 stages. An obvious kink of the crack was found in stage 1, which covered only a very short time. The stages 3, 4 and 5 accounted for the majority of life, among which the stage 3 accounted for as high as 81% of the total life. Therefore, the cycles of the weld toe crack propagating from 0.1 mm to the thickness of the flange can be defined as the prediction life of this kind of structures.

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Section: Conventional Approaches To Predicting Life For Welded Jointsmentioning

confidence: 99%

Analysis of the Fatigue Crack Evolution of Corrugated Web Girders

Wei

et al. 2019

Metals

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“…However, even for the classical type of linear plain bearings made of metallic materials, no appropriate calculation methods have been developed, although this is necessary for the needs of engineering practice. To study the contact strength, wear and resource of this type of linear bearings with metal elements, the known computational methods [1][2][3][4][5][6] and numerical methods (Ansys) [7][8][9] were not used. With regard to metalpolymer linear bearings, there are no effective and sound computational methods for their study.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the contact pressures and resource of metal-polymer linear cylindrical plain bearings

Chernets¹,

Kornienko²,

Радько³

et al. 2021

FME Transactions

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Different types of linear bearings (guides) are widely used in practice in various equipment, as in many other areas of human activity. In particular, this applies to cylindrical guides (linear plain bearings) of reciprocating motion. However, despite their considerable distribution, in fact, there are no reasonable methods for calculating the wear and service life of not only metal but also metal-polymer linear bearings. According to the author's method, the influence of load, base diameter and radial clearance on the maximum initial pressures in this bearing was investigated within the plane contact problem of the theory of elasticity. Further, using the computational method according to the author's tribokinetic model of wear during sliding friction, the effect of the composite bushing wear on the change of the initial contact characteristics (contact pressures and contact angle) was evaluated. The forecast calculation of the service life of the bearing depending on the above factors is also carried out. Quantitative and qualitative regularities of dependence of contact pressures and a resource on the accepted factors are established.

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