Endurance limit of autofrettaged Diesel-engine injection tubes with defects

Herz, Elisabeth; Thumser, Rayk; Bergmann, J.; Vormwald, Michael

doi:10.1016/j.engfracmech.2005.06.006

Cited by 31 publications

(19 citation statements)

References 25 publications

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“…For the numerical simulation of crack opening and closure we used the system of a thick walled pipe similar to the system used in [31]. However, the 3D-model is not suitable for the problem at hand in the present paper.…”

Section: Numerical Simulation Of the Closure Behaviourmentioning

confidence: 98%

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Methods of detailed thermal fatigue evaluation of nuclear power plant components

Rudolph¹,

Bergholz

Willuweit

et al. 2011

Materialwissenschaft Werkst

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The fatigue check of components has to be considered as an essential module of the safety concept as well as the ageing and lifetime management of nuclear power plants. It is based on special safety requirements in the design phase as well as in the framework of the ageing and lifetime management. Considerable efforts of load identification (fatigue monitoring) as well as the strict code conformity are characteristic features. The predominance of thermal cyclic loadings as well as relevant stress/strain amplitudes in the low cycle fatigue regime (LCF) are peculiarities compared to other technical domains. The code based fatigue concept is explained in the first part of the contribution. Furthermore, potentials for the quantification of existing margins are shown. On this, a new approach of mechanistic simulation of the thermal cyclic fatigue process based on short crack fracture mechanics is described in detail in the second part.

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Section: Numerical Simulation Of the Closure Behaviourmentioning

confidence: 98%

“…These questions can be answered by specific finite elements analyses including the crack in the analysis model. This approach was successfully applied for the special application of autofrettaged components [31].…”

Section: Application Examplementioning

confidence: 99%

Methods of detailed thermal fatigue evaluation of nuclear power plant components

Rudolph¹,

Bergholz

Willuweit

et al. 2011

Materialwissenschaft Werkst

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“…Genauere numerische Untersuchungen von Herz et al [43] an autofrettierten Einspritzleitungen haben die risslängenab-hängigen Rissöffnungsdrücke p op geliefert. Die Simulation des Risswachstums in das Eigenspannungsfeld erfolgte mit Hilfe der Finite-Elemente-Methode unter Verwendung eines Plastizitätsmodelles [44], das in der Lage ist, sowohl das stark transiente Verformungsverhalten von niedrig legierten Stäh-len beim ersten Lastwechsel als auch den Eigenspannungsabbau bei zyklischer Beanspruchung abzubilden.…”

Section: Bruchmechanische Dauerfestigkeitunclassified

Autofrettage innendruckbelasteter Bauteile

Greuling

Seeger

Vormwald

2006

Mat.-wiss. u. Werkstofftech.

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Autofrettage is a local surface strengthening procedure to enhance the fatigue resistance of pressurized components. It is used since the beginning of the 20th century. The beneficial effect of the autofrettage is based on compressive residual stresses, which are induced by a single pressure overload applied before the service loading. This pressure overload is much higher than the subsequent service pressure.In the present contribution, a survey over the state of the art of the development of calculation concepts is given. After the presentation of some experimental results, which are the starting point for different calculation concepts, these concepts will be explained and used. In the end an outlook on finite life design and variable amplitude loading is given.

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“…Before dealing with the more complicated combined loading cases a realistic cyclic plasticity model has to be implemented. Such models are available [15][16][17]; however, their application requires determination of material's ratcheting behavior first and identification of the corresponding material parameters second. Such work is ongoing.…”

Section: Crack Closurementioning

confidence: 99%

Measurement and simulation of strain fields around crack tips under mixed-mode fatigue loading

Hoș¹,

Vormwald

Freire³

2015

Frattura Ed Integrità Strutturale

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ABSTRACT. For various configurations examined in a series of fatigue experiments on thin-walled tubes under tension and torsion, the experimental results -crack path, crack growth life, near crack tip deformations, and crack closure -are measured and compared to the results of some numerical simulations. Partially automated optical inspection and the digital image correlation technique were used in the experimental investigation. In the finite element analyses, an actual geometry of a cracked structure has been modeled. The mechanical material behavior has been assumed as linear elastic in a first approach for calculating stress intensity factors. The nonlinear nature of the cyclic deformation has been taken into account by applying a cyclic plasticity model, and plasticity-induced crack closure is captured by a contact formulation.

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Endurance limit of autofrettaged Diesel-engine injection tubes with defects

Cited by 31 publications

References 25 publications

Methods of detailed thermal fatigue evaluation of nuclear power plant components

Methods of detailed thermal fatigue evaluation of nuclear power plant components

Autofrettage innendruckbelasteter Bauteile

Measurement and simulation of strain fields around crack tips under mixed-mode fatigue loading

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