Ermüdungsfestigkeit

doi:10.1007/978-3-540-71459-0

Cited by 19 publications

(13 citation statements)

References 462 publications

(733 reference statements)

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“…The relation between elasto-plastic stress concentration factor σ α and the strain concentration factor ε α as well as the pure elastic concentration factor k α is given for sharp and mild notches in Equation (1) and (2) [2].…”

Section: Elasto-plastic Notch Stressmentioning

confidence: 99%

“…The form factors represent the ratio between the stress or strain at notch root (1) and (2), and can be expressed as given in Equation (3) and (4).…”

Section: Elasto-plastic Notch Stressmentioning

confidence: 99%

“…In Figure 4 this is displayed for a representative hysteresis with a mean-stress m σ and mean-strain m є . The correlation between stress σ and strain є is plotted for a strain-amplitude a є , which can be splitted into a viscous vis є and an elastic el є part [2].…”

Section: Strain Controlled Testsmentioning

confidence: 99%

“…Hereby a straight line for the elastic and plastic share can be found in a good correlation. To evaluate this, the approach from Manson [27], Coffin [28] and Morrow [29] following Equation 6 and f є′ can be determined from intersection points with the vertical axis [2].…”

Section: Strain Controlled Testsmentioning

confidence: 99%

“…The two lines depend on each other because the ratio between the elastic and the viscous shares must remain the same. To ensure this, the condition following Equation (7) must be fulfilled [2].…”

Section: Strain Controlled Testsmentioning

confidence: 99%

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Applicability of Strain Controlled Cyclic Tests for Short Fibre Reinforced Polymers

Primetzhofer¹,

Stadler²,

Pinter³

et al. 2019

MSA

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To develop parts, made of short glas fibre reinforced (sgfr) polymers for industrial purposes, a comprehensive material knowledge is necessary. Especially the material behaviour under cyclic loads has a great influence on the life time of parts. Parts are often used under complex load cases (stress state, temperature, ...), therefore it is indispensable to understand the effect of the main influence factors. High loads within load histories as well as stress concentrations can lead to plastic deformations. To cover this in an early stage of the development process, a closed simulation chain should be established. Therefore, the applicability of common material models (e.g. fatigue criteria according to Ramberg-Osgood) has to be studied first, the models have to be adapted or even new models have to be found for sgfr materials. This work focuses on the applicability of strain controlled cyclic tests for glass fibre reinforced polymers. Hereby the cyclic stress rearrangement in the low cycle regime of the S/N-curve can be described. Therefore, tests were performed on a 50 wt% sgfr partial aromatic polyamide. For the fatigue tests un-notched, injection moulded specimen were used. The tests show a principal applicability of strain controlled LCF-tests for sgfr polymers.

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Section: Elasto-plastic Notch Stressmentioning

confidence: 99%

“…The form factors represent the ratio between the stress or strain at notch root (1) and (2), and can be expressed as given in Equation (3) and (4).…”

Section: Elasto-plastic Notch Stressmentioning

confidence: 99%

Section: Strain Controlled Testsmentioning

confidence: 99%

Section: Strain Controlled Testsmentioning

confidence: 99%

Section: Strain Controlled Testsmentioning

confidence: 99%

See 3 more Smart Citations

Applicability of Strain Controlled Cyclic Tests for Short Fibre Reinforced Polymers

Primetzhofer¹,

Stadler²,

Pinter³

et al. 2019

MSA

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Fatigue Lives and Damage Mechanisms at Elevated Temperatures of Steel 42CrMo4 in the HCF and VHCF Regime

Schmiedel,

Kirste,

Morgenstern

et al. 2024

Springer Series in Materials Science

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This chapter is focused on the fatigue life and damage mechanisms of steel 42CrMo4 in the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) regimes at temperatures up to 773 K. For this purpose, resonance fatigue testing was used at different test frequencies (90 Hz and 20 kHz). The influences of the manufacturing process (wrought or cast condition), as well as the core hardness (various heat treatment conditions), were investigated. Fractographic examinations of the fracture surfaces allowed the analysis of crack-initiating defects. Together with light microscopic observations of the defect distribution, the fatigue mechanisms of the steel 42CrMo4 were investigated at different temperatures (RT, 473 K and 773 K). A short crack model according to Chapetti applied to the present results was used to describe the change in the fatigue damage mechanisms operating at RT/473 K and 773 K, respectively. It is shown that high-temperature fatigue at 773 K was dominated by crack growth, whereas fatigue at RT and 473 K was dominated by crack initiation. These investigations complete the work presented in Chap. 24, in which the influence of nonmetallic inclusions on the ultrasonic fatigue behaviour of steel 42CrMo4 is being analysed at room temperature. The present results provide important insights into the crack-initiating defects and their distributions as they are relevant in typical industrial applications.

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