Arc sine % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaOaaaeaaca% WGqbaaleqaaaaa!36DD!\[\sqrt P \] transformation - an effective tool for graphical and numerical evaluation of planned W�hler experiments

Dengel, D.; Khani, M. Karim

doi:10.1007/bf00018511

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…In terms of the fatigue strength assessment, the statistical evaluation in the finite-life region is conducted by application of the common procedure ASTM-E739 [54]. Moreover, the endurance limit region is evaluated by means of the arcsin √ P methodology [55]. Further, the second slope k 2 is set to a value of 45 as suggested in [56,57].…”

Section: Fatigue Test Resultsmentioning

confidence: 99%

“…Run-out specimens are re-inserted and tested again at a higher load level to provoke a burst failure. Regarding the statistical assessment of the fatigue strength, the standard [54] is applied in the finite-life and the arcsine √ P approach [55] is utilized in the long life fatigue region. The results of the high-cycle fatigue tests considering both load stress ratios are illustrated in Figures 14 and 15 in terms of filled circles and triangles.…”

Section: Fatigue Test Resultsmentioning

confidence: 99%

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Notch Stress Intensity Factor (NSIF)-Based Fatigue Design to Assess Cast Steel Porosity and Related Artificially Generated Imperfections

Schuscha

Horvath

Leitner

et al. 2019

Metals

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Shrinkage porosities and non-metallic inclusions are common manufacturing process based defects that are present within cast materials. Conventional fatigue design recommendations, such as the FKM guideline (“Forschungskuratorium Maschinenbau”), therefore propose general safety factors for the fatigue assessment of cast structures. In fact, these factors mostly lead to oversized components and do not facilitate a lightweight design process. In this work, the effect of shrinkage porosities on the fatigue strength of defect-afflicted large-scale specimens manufactured from the cast steel G21Mn5 is studied by means of a notch stress intensity factor-based (NSIF-based) generalized Kitagawa diagram. Additionally, the mean stress sensitivity of the material is taken into account and establishes a load stress ratio enhanced diagram. Thereby, the fatigue assessment approach is performed by utilizing the defects sizes taken either from the fracture surface of the tested specimens or from non-destructive X-ray investigations. Additionally, a numerical algorithm invoking cellular automata, which enables the generation of artificial defects, is presented. Conclusively, a comparison to the results of the experimental investigations reveals a sound agreement to the generated spatial pore geometries. To sum up, the generalized Kitagawa diagram, as well as a concept utilizing artificially generated defects, is capable of assessing the local fatigue limit of cast steel G21Mn5 components and features the mapping of imperfection grades to their corresponding fatigue strength limit.

show abstract

Section: Fatigue Test Resultsmentioning

confidence: 99%

Section: Fatigue Test Resultsmentioning

confidence: 99%

Notch Stress Intensity Factor (NSIF)-Based Fatigue Design to Assess Cast Steel Porosity and Related Artificially Generated Imperfections

Schuscha

Horvath

Leitner

et al. 2019

Metals

View full text Add to dashboard Cite

show abstract

“…In addition, the finite fatigue life regime was by selecting two load amplitudes each covered by five fatigue tests. The respectively resulting cycleto-failure-distributions were evaluated by the method given in [7] yielding the values for 50%failure probability in each case which finally are used to plot the descending lines depicted in Fig. 7 characterizing the left hand part of the Woehler curves.…”

Section: Woehler Curvesmentioning

confidence: 99%

Investigation on the Influence of Manufacturing Parameters on the Fatigue Strength of Components

Reiss

Engel

Merklein

2013

KEM

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With cold forging processes it is possible to produce parts characterized by high strength, high dimensional accuracy and high surface quality. In order to optimize the forming process and to be able to use the advantages of cold forging specifically and combined, it is necessary to find correlations between the manufacturing parameters, the strength and the properties, like hardness distribution and surface quality, of the component. The research work covered in this paper focuses on the influence of the components properties influenced by its manufacturing history on their fatigue strength. The used component is a flange hub, produced by a four-stage cold forging process. To obtain different component properties the production process of the hub was varied for example by changing the heat treatment or by producing the parts by turning process. First of all, the components’ properties, for example hardness distribution, remaining residual stresses, orientation of fibers and surface quality, were determined. Moreover, a special experimental setup for the fatigue tests has been designed. The components’ fatigue behavior was determined using a high frequency pulsator and evaluated in terms of finite life fatigue strength and fatigue endurance limit. These examinations were used to produce Woehler curves for the differently manufactured components with a certain statistical data analysis method.

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“…To properly interpret the test results, planning of the fatigue tests as well as a statistical evaluation of the results is of vital importance. [20] While stress-controlled fatigue tests, which results are displayed in S-N-curves, are more engineering related, straincontrolled tests also consider materials physics. During the fatigue in stress-controlled tests the strain changes due to cyclic hardening or softening.…”

Section: Reviewsmentioning

confidence: 99%

Fatigue of Magnesium Alloys

Potzies¹,

Kainer²

2004

Adv Eng Mater

175

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Magnesium alloys show a high specific strength and are therefore increasingly used for light‐weight constructions in transportation industry.[1,2] To predict the behaviour of the material under the influence of cyclic loading it is vital to understand the fatigue behaviour of magnesium alloys. Only when understood properly, it is possible to fully apply the potential weight reduction by using magnesium alloys. A very important aspect in fatigue of magnesium alloys is the influence of a corrosive media and elevated temperatures, of which both are relevant in automotive applications. These two factors tend to have deleterious effects on magnesium alloys and therefore also have to be considered in investigations on the fatigue behaviour of magnesium alloys.

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Cited by 6 publications

References 12 publications

Notch Stress Intensity Factor (NSIF)-Based Fatigue Design to Assess Cast Steel Porosity and Related Artificially Generated Imperfections

Notch Stress Intensity Factor (NSIF)-Based Fatigue Design to Assess Cast Steel Porosity and Related Artificially Generated Imperfections

Investigation on the Influence of Manufacturing Parameters on the Fatigue Strength of Components

Fatigue of Magnesium Alloys

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