Das Konzept der lokalen Dauerfestigkeit und seine Anwendung auf martensitische Randschichten, insbesondere Laserhärtungsschichten

Winderlich, B.

doi:10.1002/mawe.19900211006

Cited by 28 publications

(7 citation statements)

References 33 publications

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“…Feasible approaches for deriving the local distribution of fatigue properties include the correlation with parameters, which can be measured easily, like hardness [16] or grain size of microstructures. By now correlations of material properties with the grain size have been postulated only for static mechanical characteristics [17].…”

Section: Consideration Of Strain Distribution In Finiteelement-analysismentioning

confidence: 99%

Severe plastic deformation by linear flow splitting

Müller

Bohn²,

Bruder

et al. 2007

Materialwissenschaft Werkst

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Due to the new linear flow splitting forming process the production of bifurcated profiles from sheet metal without lamination of material becomes feasible. The continuous production of such structures takes place incrementally in a modified roll forming machine. By producing those complex parts process-related changes in the material properties occur as a result of the cold forming. Thus, the assumption of homogeneous properties in the processed part is not valid and a reliable analysis of structural durability is only possible by considering changes in material properties. Investigations on linear flow split profiles show large gradients in the microstructure and properties over the profile cross section. In the areas of low plastification the degree of deformation and the flow stress can be determined by microstructure and hardness measurements. In the severely deformed areas, like the upper flange surface, this determination becomes doubtable. Therefore the electron backscattered diffraction method was used to investigate, if an ultrafine-grained structure is occurring as it evolves in the processes of severe plastic deformation. Thus, the aim of this paper is the numerical analysis of the linear flow splitting process, the metallographic characterisation of bifurcated profiles and the numerical evaluation of the structural durability with consideration of the gained insights

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Section: Consideration Of Strain Distribution In Finiteelement-analysismentioning

confidence: 99%

Severe plastic deformation by linear flow splitting

Müller

Bohn²,

Bruder

et al. 2007

Materialwissenschaft Werkst

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“…Finally, the numerically evaluated local material properties, such as hardness and residual stress state, are taken into account when assessing local fatigue behavior. As presented in [19,20] for martensitic surface layers, the local fatigue concept is applicable when properly assessing the fatigue resistance of a hardened surface layer. Induction hardening consists of two parts, inductive heating and subsequent quenching.…”

Section: Introductionmentioning

confidence: 99%

Numerical Fatigue Analysis of Induction-Hardened and Mechanically Post-Treated Steel Components

2019

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This paper presents a numerical simulation chain covering induction hardening (IH), superimposed stroke peening (StrP) as mechanical post-treatment, and a final fatigue assessment considering local material properties. Focusing on a notched round specimen as representative for engineering components, firstly, the electro-magnetic-thermal simulation of the inductive heating is performed with the software Comsol®. Secondly, the thermo-metallurgical-mechanical analysis of the hardening process is conducted by means of a user-defined interface, utilizing the software Sysweld®. Thirdly, mechanical post-treatment is numerically simulated by Abaqus®. Finally, a strain-based approach considering the evaluated local material properties is applied, which reveals sound accordance to the fatigue tests results, exhibiting a minor conservative deviation of only up to two per cent, which validates the applicability of the presented numerical fatigue approach.

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“…For a long time, the calculation of the endurance limit of case-hardened parts has been a subject of scientific and practical interest. Starting from the early work of Woodvines, 1 in the last years especially the results of carburizing, 2,3 nitriding, 2,4-7 induction hardening 8,9 and laser hardening 10,11 have been investigated with respect to the endurance limit. The following contribution describes a calculation method for carburized steels, which allows the prediction of the endurance limit of parts of arbitrary geometry based on data that have been gained from tests on a set of reference specimens under certain load conditions.…”

Section: Introductionmentioning

confidence: 99%

“…For a long time, the calculation of the endurance limit of case‐hardened parts has been a subject of scientific and practical interest. Starting from the early work of Woodvines, 1 in the last years especially the results of carburizing, 2,3 nitriding, 2,4–7 induction hardening 8,9 and laser hardening 10,11 have been investigated with respect to the endurance limit.…”

Section: Introductionmentioning

confidence: 99%

Application of the weakest‐link concept to the endurance limit of notched and multiaxially loaded specimens of carburized steel 16MnCrS5

Bomas

Schleicher

2005

Fatigue Fract Eng Mat Struct

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A B S T R A C T Based on the weakest-link concept a method is developed, from which the endurance probability of every surface and volume element of a case-hardened part, which is loaded near the endurance limit, can be calculated. A prerequisite for the calculation is knowledge of the hardness and residual stress distribution, the surface roughness and the surface oxidation depth. By multiplication of the endurance probabilities of neighboured elements the endurance probability of a limited region or of the whole part can be calculated, which includes an endurance limit determination. It is shown, that this model can be applied successfully to specimens of a carburized steel. The necessary model parameters can be gained from a set of reference specimens. Because of the possibility to formulate an endurance probability for every volume and surface element, there are no geometrical restrictions on the parts to be assessed. N O M E N C L A T U R EA 0 = reference area AT = alternating torsion F = distribution function m = exponent of the two-parametric Weibull distribution M = mean stress sensitivity N F = number of cycles to failure p = hydrostatic stress P E = endurance probability P F = failure probability R = load ratio RB = rotary bending RT = repeated tension S a = nominal stress amplitude S D = median of the endurance limit described as nominal stress S m = nominal mean stress SO = surface oxidation TC = tension compression V 0 = reference volume x SO = depth of surface oxidation λ = X-ray wave length c 2005 Blackwell Publishing Ltd. Fatigue Fract Engng Mater Struct 28, 983-995 983 984 H. BOMAS and M. SCHLEICHERσ a = local stress amplitude σ aeq = equivalent stress amplitude σ m = local mean stress σ W = local endurance limit for symmetric tension-compression τ W = local endurance limit for symmetric shear I N T R O D U C T I O NFor a long time, the calculation of the endurance limit of case-hardened parts has been a subject of scientific and practical interest. Starting from the early work of Woodvines, 1 in the last years especially the results of carburizing, 2,3 nitriding, 2,4-7 induction hardening 8,9 and laser hardening 10,11 have been investigated with respect to the endurance limit. The following contribution describes a calculation method for carburized steels, which allows the prediction of the endurance limit of parts of arbitrary geometry based on data that have been gained from tests on a set of reference specimens under certain load conditions. The endurance limit refers to a number of cycles equal to 10 7 . It is known that fatigue failure of high-carbon steel may also occur after passing this number of cycles, 12 this is a feature that could not be examined in this work.For the development of this calculation method, the endurance limits of smooth and notched specimens under tension-compression, repeated tension, rotary bending and alternating torsion have been determined experimentally. Hereby, the influence of mean stresses, multiaxial stress conditions, stress gradients and gradients of the...

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Das Konzept der lokalen Dauerfestigkeit und seine Anwendung auf martensitische Randschichten, insbesondere Laserhärtungsschichten

Cited by 28 publications

References 33 publications

Severe plastic deformation by linear flow splitting

Severe plastic deformation by linear flow splitting

Numerical Fatigue Analysis of Induction-Hardened and Mechanically Post-Treated Steel Components

Application of the weakest‐link concept to the endurance limit of notched and multiaxially loaded specimens of carburized steel 16MnCrS5

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