On the fatigue limit of ductile metals under complex multiaxial loading

Zenner, Harald; Simbürger, Armin; Liu, Jiping

doi:10.1016/s0142-1123(99)00107-3

Cited by 110 publications

(73 citation statements)

References 13 publications

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“…Further extensive analyses incorporating the Huber-Mises-Hencky and additional multiaxial criteria, e.g. integral-based approaches [9], are scheduled.…”

Section: Discussionmentioning

confidence: 99%

“…Hence, further investigations incorporating equivalent stress analysis with various basic non-proportional load-scenarios and the presented load distribution for a 16-cylinder gas engine is scheduled. Additional multiaxial stress criteria, such as integral-based methods [9], are applied in order to proof their accuracy.…”

Section: Effect Of Phase Shift and Frequency Ratiomentioning

confidence: 99%

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Multiaxial fatigue assessment of crankshafts by local stress and critical plane approach

Leitner¹,

Grün²,

Tuncali³

et al. 2016

Frattura Ed Integrità Strutturale

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ABSTRACT. For multiaxially-loaded parts several stress-based fatigue assessment concepts are applicable mostly taking uniaxial test results as basis. These approaches work well in case of proportional loading states, but on contrary, for non-proportional stress conditions, implying a change of the principal stress direction, deviations in the fatigue life estimation may occur. The aim of this study is to evaluate the cyclic multiaxial material behavior experimentally and to proof the applicability of stress-based methods to assess the fatigue strength. The investigated base materials incorporate the commonly applied crankshaft steels 50CrMo4 and 34CrNiMo6 without surface-layer post-treatments. Extensive fatigue tests with small-scale specimens are performed to evaluate the material behavior under cyclic loading. The experiments include basic uniaxial characterizations, such as notch stress sensitivity and effect of loading type, including tests under tension, rotating bending, and torsion loading. Additionally, combined loading tests with proportional and non-proportional situations are presented to reveal the fatigue resistance for multiaxial stress states. Significant loading conditions, such as proportional stress under rotating bending and torsion, and further on, non-proportional effects like phase shifts and varying frequency ratios are presented. The local fatigue strength assessment is performed on the basis of the critical plane approach, whereat the normal and shear stresses are transformed in numerous cutting planes. Equivalent stress hypotheses are applied and compared with the Citation: Leitner, M., Grün, F., Tuncali, Z., Steiner, R., Chen, W., Multiaxial fatigue assessment of crankshafts by local stress and critical plane approach, Frattura ed Integrità Strutturale, 38 (2016) M. Leitner et alii, Frattura ed Integrità Strutturale, 38 (2016) [47][48][49][50][51][52][53] 48 experiments showing that the Huber-Mises-Hencky criterion fits well to the test results in case of proportional rotating bending and torsion loading.

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“…Further extensive analyses incorporating the Huber-Mises-Hencky and additional multiaxial criteria, e.g. integral-based approaches [9], are scheduled.…”

Section: Discussionmentioning

confidence: 99%

Section: Effect Of Phase Shift and Frequency Ratiomentioning

confidence: 99%

Multiaxial fatigue assessment of crankshafts by local stress and critical plane approach

Leitner¹,

Grün²,

Tuncali³

et al. 2016

Frattura Ed Integrità Strutturale

View full text Add to dashboard Cite

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“…HMH hypothesis also assumes a constant ratio of tension-compression up to torsion fatigue limit equal to . Whereas Zenner et al [3] claim that for ductile materials this ratio is contained in interval . According to the above mentioned observations the fatigue criterion has been formulated, which for loads with no mean values (means are not the subject of analysis of this study), can be written as follows: (8) Coefficients a and b are dependent on the material properties.…”

Section: Zenner and Liu Criterion In Case Of Non-proportional Loadsmentioning

confidence: 97%

“…In his works [1,2,3], Zenner notes that Novoshilov, in his approach, accounts neither for the phase shift angle between the courses of load components nor for normal stress. This kind of approach remains inconsistent with the results of experimental tests which confirm an impact of the phase shift and mean stress on the material fatigue behavior.…”

Section: Zenner and Liu Criterion In Case Of Non-proportional Loadsmentioning

confidence: 99%

“…According to Zenner et al [3], it is the shear stress vector module, maximal during one load cycle, to be accepted as amplitude . Such an approach does not account for the fact that during a cycle of non-proportional load, apart from the module, also the vector of shear stress changes its direction, drawing a hodograph.…”

Section: Zenner and Liu Criterion In Case Of Non-proportional Loadsmentioning

confidence: 99%

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Modification of Zenner and Liu Criterion due to Non-Proportionality of Fatigue Load by Means of MCE Approach

Pejkowski

Skibicki

2014

KEM

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ABSTRACT. The integral approach is considered to be the proper one to be used for formulation of multi-axial fatigue criteria. The results of experimental verification of belonging to this group Zenner criterion confirm its efficiency in for nonproportional loads. Thanks to application of a generalized fatigue parameter, this criterion is useful for different types of proportional loads and for various materials. However, for non-proportional loads of high non-proportionality degree, the fatigue estimation error often exceeds scatter band 3. In this paper a proposal has been presented concerning modification of Zenner criterion. It involves introduction of a load non-proportionality measure by means of the MCE method.

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Schwingfestigkeit von Kehlnähten mit und ohne Fugenöffnung

Özden

2008

Materialwissenschaft Werkst

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Auf die Frage; hat das Dickblechschweißen mit und ohne Fugenvorbereitung einen dominierenden Einfluss auf die Schwingfestigkeit? In der Literatur gibt es über den Einfluss der Nahtformen auf die Betriebsfestigkeit nicht genügende Arbeiten zu finden, deren Angaben aber in manchen Fällen einander widersprechen. Die Minimierung des Nahtquerschnittes sowie der Verzicht der Nahtvorbereitung und der Nahtnachbearbeitung wirken entscheidend auf die Fertigungskosten der Schweißverbindung. Zugleich kann enorme Zeit, Material und Energie eingespart werden.In dieser Arbeit wird das Schwingfestigkeitsverhalten von Kehlnahtverbindungen mit und ohne Fugenvorbereitung unter Biegeund Torsionsbeanspruchungen untersucht. Die Untersuchungsergebnisse werden dargestellt und kommentiert. Als das wichtigste Untersuchungsergebnis ist festzustellen, dass die Nahtform beim HV-und HY-Kehlnähten unter Biege-und Torsionsbeanspruchungen keinen dominierenden Einfluss auf die Schwingfestigkeit hat. Die Wöhlerlinien verlaufen für beide Nahtformen fast identisch.Schlüsselworte: Schwingfestigkeit, Nahtformeinfluss, Kehlnaht, Nahtvorbereitung Does the thick sheet metal welding with and without joint preparation have a dominating influence on the operating strength? In the literature there is not sufficient work to find over the influence of the weld shapes on the operating strength. The minimization of the seam cross section as well as without the joint preparation affect crucially the production costs of the welded joint constructions and at the same time, can be saved enormous time, material and energy. In this work the operating strength behavior of the fillet weld joints with and without joint preparation under bending and subjections to torsion is examined. The test results are represented and commentated in diagrams and tables. As most important test results it can be determined that the weld shape does not have dominating influence on the structural durability in the pure bending und torsion loading. The life time lines run for both weld shapes (HV-and HY-fillet welds) nearly identically.

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On the fatigue limit of ductile metals under complex multiaxial loading

Cited by 110 publications

References 13 publications

Multiaxial fatigue assessment of crankshafts by local stress and critical plane approach

Multiaxial fatigue assessment of crankshafts by local stress and critical plane approach

Modification of Zenner and Liu Criterion due to Non-Proportionality of Fatigue Load by Means of MCE Approach

Schwingfestigkeit von Kehlnähten mit und ohne Fugenöffnung

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