Details
| Original language | English |
|---|---|
| Pages (from-to) | 88-97 |
| Number of pages | 10 |
| Journal | Procedia Engineering |
| Volume | 66 |
| Publication status | Published - 6 Feb 2013 |
| Event | 5th International Conference on Fatigue Design, Fatigue Design 2013 - Senlis, France Duration: 27 Nov 2013 → 28 Nov 2013 |
Abstract
Fatigue strength curves that are established from fatigue tests provide a basis for the fatigue assessment applying nominal stress approach. In the codes valid for steel structures, like the EC 3, the fatigue strength curves for constant amplitude loading have a knee point in the transition region. The fatigue strength curve beyond this knee point is commonly assumed to be a horizontal asymptote. However, the behaviour of the fatigue strength curve in the area of very high cycles and more importantly the existence of an endurance limit are much discussed. In the case of welded joints the experimental data beyond 107 load cycles is limited due to the possibilities in testing. Testing techniques with high frequencies are necessary to obtain experimental data with very high cycles in a reasonable period of time. In this scope a testing device with approximately 390 Hz operates by alternating current magnets and using resonance amplification, which was developed by a third party. This testing device was investigated and advanced for the application of long term tests reaching 5·108 load cycles. Fatigue tests on axially loaded butt welds with constant amplitude loading are conducted in three test series until very high cycles. The fatigue tests include the area of high and very high cycles. The influence of test frequency and stress ratio is investigated.
Keywords
- SN-curves, Steel, Stress ratio, Test frequency, Very high cylce fatigue, Welded joints
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
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In: Procedia Engineering, Vol. 66, 06.02.2013, p. 88-97.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Fatigue tests of axially loaded butt welds up to very high cycles
AU - Schaumann, P.
AU - Steppeler, S.
PY - 2013/2/6
Y1 - 2013/2/6
N2 - Fatigue strength curves that are established from fatigue tests provide a basis for the fatigue assessment applying nominal stress approach. In the codes valid for steel structures, like the EC 3, the fatigue strength curves for constant amplitude loading have a knee point in the transition region. The fatigue strength curve beyond this knee point is commonly assumed to be a horizontal asymptote. However, the behaviour of the fatigue strength curve in the area of very high cycles and more importantly the existence of an endurance limit are much discussed. In the case of welded joints the experimental data beyond 107 load cycles is limited due to the possibilities in testing. Testing techniques with high frequencies are necessary to obtain experimental data with very high cycles in a reasonable period of time. In this scope a testing device with approximately 390 Hz operates by alternating current magnets and using resonance amplification, which was developed by a third party. This testing device was investigated and advanced for the application of long term tests reaching 5·108 load cycles. Fatigue tests on axially loaded butt welds with constant amplitude loading are conducted in three test series until very high cycles. The fatigue tests include the area of high and very high cycles. The influence of test frequency and stress ratio is investigated.
AB - Fatigue strength curves that are established from fatigue tests provide a basis for the fatigue assessment applying nominal stress approach. In the codes valid for steel structures, like the EC 3, the fatigue strength curves for constant amplitude loading have a knee point in the transition region. The fatigue strength curve beyond this knee point is commonly assumed to be a horizontal asymptote. However, the behaviour of the fatigue strength curve in the area of very high cycles and more importantly the existence of an endurance limit are much discussed. In the case of welded joints the experimental data beyond 107 load cycles is limited due to the possibilities in testing. Testing techniques with high frequencies are necessary to obtain experimental data with very high cycles in a reasonable period of time. In this scope a testing device with approximately 390 Hz operates by alternating current magnets and using resonance amplification, which was developed by a third party. This testing device was investigated and advanced for the application of long term tests reaching 5·108 load cycles. Fatigue tests on axially loaded butt welds with constant amplitude loading are conducted in three test series until very high cycles. The fatigue tests include the area of high and very high cycles. The influence of test frequency and stress ratio is investigated.
KW - SN-curves
KW - Steel
KW - Stress ratio
KW - Test frequency
KW - Very high cylce fatigue
KW - Welded joints
UR - http://www.scopus.com/inward/record.url?scp=84894467394&partnerID=8YFLogxK
U2 - 10.1016/j.proeng.2013.12.065
DO - 10.1016/j.proeng.2013.12.065
M3 - Conference article
AN - SCOPUS:84894467394
VL - 66
SP - 88
EP - 97
JO - Procedia Engineering
JF - Procedia Engineering
SN - 1877-7058
T2 - 5th International Conference on Fatigue Design, Fatigue Design 2013
Y2 - 27 November 2013 through 28 November 2013
ER -