Fatigue behaviour of technical springs

Kaiser, Bruno; Berger, Christina

doi:10.1002/mawe.200500940

Cited by 20 publications

(13 citation statements)

References 14 publications

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“…S-N curves for 10, 50 and 90 % probability of failure P f for shot-peened helical compression springs of Si-Cr-alloyed valve spring wire with 2 mm diameter [1] Abbildung 1. Wöhlerlinien für 10, 50 und 90 % Bruchwahrscheinlichkeit P f von kugelgestrahlten Schraubendruckfedern aus SiCr-legiertem Federdraht mit 2 mm Durchmesser [1] l Some alloys of both lattice types show a change in crack initiation site from surface to subsurface in a region from LCF to VHCF and therefore a change in failure mechanism. Subsurface failures often start from microscopic defects (inclusions, pores), but sometimes these failures can not be retraced to microscopic inclusions.…”

Section: Introductionmentioning

confidence: 99%

Beyond HCF – Is there a fatigue limit?

Berger

Pyttel²,

Schwerdt

2008

Materialwissenschaft Werkst

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The paper gives an overview to the present state of research on fatigue strength and failure mechanisms at very high number of cycles (N>10 7 ). Testing facilities are listed. A classification of materials with typical S-N curves and influencing factors like notches, residual stresses and environment are given. Different failure mechanisms, which occur especially in the VHCF-region like subsurface failure, are explained. There microstructural inhomogeneities and statistical conditions play an important role. Investigated materials are different metals with body-centred cubic lattice like lowor high-strength steels and quenched and tempered steels but also materials with a face-centred cubic lattice like aluminium alloys and copper.

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Section: Introductionmentioning

confidence: 99%

Beyond HCF – Is there a fatigue limit?

Berger

Pyttel²,

Schwerdt

2008

Materialwissenschaft Werkst

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“…Fatigue failures of components cyclically loaded in the gigacycle regime and fatigue tests on material specimens in the 1980s and 1990s [ 4 ] have challenged this assumption. Inspired by this challenge, researchers conducted fatigue experiments beyond 10

cycles [ 5 ]. The results of these fatigue experiments disprove the assumption of a pronounced fatigue strength around 10

or 10

cycles for compression springs.…”

Section: Utilized Statistical Model For Fatigue Eventsmentioning

confidence: 99%

“…For ultimate numbers of cycles beyond 10

, fewer datasets are available. All available datasets were generated in a series of research projects at Technical University of Darmstadt [ 3 , 5 , 16 , 34 ].…”

Section: Experimental Setupmentioning

confidence: 99%

On the Influence of Ultimate Number of Cycles on Lifetime Prediction for Compression Springs Manufactured from VDSiCr Class Spring Wire

2020

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For the generation of fatigue curves by means of fatigue tests, an ultimate number of cycles must be chosen. This ultimate number of cycles also limits the permissible range of the fatigue curve for the design of components. This introduces extremely high costs for testing components that are to be used in the Very High Cycle Fatigue regime. In this paper, we examine the influence of the ultimate number of cycles of fatigue tests on lifetime prediction for compression springs manufactured from VDSiCr class spring wire. For this purpose, we propose a new kind of experiment, the Artificial Censoring Experiment (ACE). We show that ACEs may be used to permissibly extrapolate the results of fatigue tests on compression springs by ensuring that a batch-specific minimum ultimate number of cycles has been exceeded in testing. If the minimum ultimate number of cycles has not been exceeded, extrapolation is inadmissible. Extrapolated results may be highly non-conservative, especially for models assuming a pronounced fatigue limit.

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“…This leads to a static torsion load superimposed to cyclic torsion and typical load ratios between R = 0.3 and 0.5. An existing method that was recently used to study the VHCF properties of coil springs with preloads is to test a great number of springs in parallel in one test frame . The cycling frequency of maximum 43 Hz however means that VHCF tests require long testing times.…”

Section: Cyclic Torsion Loadingmentioning

confidence: 99%

“…An existing method that was recently used to study the VHCF properties of coil springs with preloads is to test a great number of springs in parallel in one test frame. [72][73][74] The cycling frequency of maximum 43 Hz 73 however means that VHCF tests require long testing times. Ultrasonic torsion fatigue testing at high load ratios offers an interesting time-saving alternative to this conventional test method.…”

Section: Cyclic Torsion Loading At Positive Load Ratiosmentioning

confidence: 99%

Recent developments in ultrasonic fatigue

Mayer¹

2015

Fatigue Fract Eng Mat Struct

150

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The recently increased interest in very high cycle fatigue properties of materials has led to extended use and further development of the ultrasonic fatigue testing technique. Specimens are stimulated to resonance vibrations at ultrasonic frequency, where the high frequency allows collecting lifetime data of up to 1010 cycles and measuring crack propagation rates down to 10−12 m per cycle within reasonable testing times. New capabilities and methods of ultrasonic testing and outstanding results obtained since the year 1999 are reviewed. Ultrasonic tests at load ratios other than R = −1, variable amplitude tests, cyclic torsion tests and methods for in situ observation of fatigue damage are described. Advances in testing at very high temperatures or in corrosive environments and experiments with other than bulk metallic materials are summarized. Fundamental studies with copper and duplex steel became possible and allowed new insights into the process of very high cycle fatigue damage. Higher cyclic strength of mild steels measured at ultrasonic frequency because of plastic strain rate effects are described. High‐strength steels and high‐alloy steels are less prone to frequency influences. Environmental effects that can lead to prolonged lifetimes in some aluminium alloys and possible frequency effects in titanium and nickel and their alloys are reviewed.

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Fatigue behaviour of technical springs

Cited by 20 publications

References 14 publications

Beyond HCF – Is there a fatigue limit?

Beyond HCF – Is there a fatigue limit?

On the Influence of Ultimate Number of Cycles on Lifetime Prediction for Compression Springs Manufactured from VDSiCr Class Spring Wire

Recent developments in ultrasonic fatigue

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