Fatigue strength assessment of laser welded thin-walled joints made of mild and high strength steel
Source abstract
Abstract
Abstract A database of fatigue tests taken from literature on thin-walled laser welded joints was created. Fatigue tests related to specimens made of different steel grades were considered, i.e. conventional and high strength steel, which is becoming of more concern in the automotive industry. For each specimen geometry in the database, the stress field in the notch ligament was obtained by means of finite element analysis, where the reference radius of ρ f = 0.05 mm was modelled. The fatigue assessment was performed by using three representative stresses: the maximum notch stress as well as the stress according to the critical distance and the stress averaging approach. For each assessment approach a regression S–N curve with a dedicated scatter band ( T σ ) was obtained. The scatter was taken as measure of the assessment reliability. In addition to the assessment approach, also the effect of the base material on the fatigue strength is discussed.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fatigue and fracture mechanics · Welding Techniques and Residual Stresses · Advanced Welding Techniques Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (32)
Show source-provided references
1. Light-weight design chances using high-strength steels10.1002/mawe.200600090 ↗
2. Hobbacher · 2016
3. Radaj · 2006
4. Fricke · 2012
5. Generalised Neuber concept of fictitious notch rounding10.1016/j.ijfatigue.2013.01.005 ↗
6. Neuber · 1985 · vol. 3
7. Radaj · 1990
8. Radaj D. Festigkeitsnachweise; 1974.
9. Notch stress concepts for the fatigue assessment of welded joints–background and applications10.1016/j.ijfatigue.2010.04.011 ↗
10. Recent developments in local concepts of fatigue assessment of welded joints10.1016/j.ijfatigue.2008.05.019 ↗
11. Fracture
12. Elastic field equations for blunt cracks with reference to stress corrosion cracking10.1007/BF00182890 ↗
13. Methods of predicting the fatigue lives of laser beam welded lap welds under shear stresses
14. Sn lines for welded thin joints suggested slopes and fat values for applying the notch stress concept with various reference radii10.1007/BF03266752 ↗
15. Evaluation of nominal and local stress based approaches for the fatigue assessment of seam welds10.1016/j.ijfatigue.2011.06.002 ↗
16. Durability of welded aluminium extrusion profiles and aluminium sheets in vehicle structures10.1016/j.ijfatigue.2011.01.006 ↗
17. Fatigue assessment of welded joints using stress averaging and critical distance approaches
18. Geometrical effects in fatigue: a unifying theoretical model10.1016/S0142-1123(99)00007-9 ↗
19. Method of effective stress for fatigue: Part I – A general theory10.1016/j.ijfatigue.2011.09.018 ↗
20. Fatigue design of aluminium welded joints by the local stress concept with the fictitious notch radius of rf=1mm10.1016/j.ijfatigue.2005.10.006 ↗
21. Method of effective stress for fatigue: Part II – Applications to v-notches and seam welds10.1016/j.ijfatigue.2011.09.016 ↗
22. Ertragbare strukturspannungen von lasergeschweißten stahlblechen (engl.: Endurable structural stresses of laser welded steel sheets)
23. Jens Eufinger. Lbf report 211206: Light-ebody – leichte und resourcensparende elektrofahrzeugkarosserie in multimaterialbauweise (engl.: Light-ebody – light-weight and resource saving body-in-white structure in multi-material design. Technical report, Fraunhofer LBF, 2015.
24. Eibl M. Berechnung der Schwingfestigkeit laserstrahlgeschweißter Feinbleche mit lokalen Konzepten [Ph.D. thesis]. TU Darmstadt; 2003.
25. Fatigue behavior of laser welds in lap-shear specimens of high strength low alloy steel sheets10.1016/j.ijfatigue.2013.10.019 ↗
26. Fatigue assessment of seam welds of automotive components by local stress approaches10.1002/mawe.200800354 ↗
27. On-line damage detection and monitoring at thin sheet joints for deriving failure criteria10.1051/mattech/2011118 ↗
28. European founded collaborative project superlight-car – towards a new generation of light weight automobiles
29. An efficient meshing approach for the calculation of notch stresses10.1007/s40194-012-0005-3 ↗
30. A consideration of allowable equivalent stresses for fatigue design of welded joints according to the notch stress concept with reference radii rref=1.00 and 0.05mm10.1007/BF03266705 ↗
31. Fatigue approaches for welded structures
32. Course of sn-curves especially in the high-cycle fatigue regime with regard to component design and safety10.1016/j.ijfatigue.2006.11.015 ↗