scholarly journals Multiaxial fatigue strength of titanium alloys

2017 ◽  
Vol 11 (41) ◽  
pp. 79-89 ◽  
Author(s):  
Filippo Berto ◽  
Alberto Campagnolo ◽  
Torgeir Welo ◽  
Sabrina Vantadori ◽  
Andrea Carpinteri
Keyword(s):  
Fatigue Strength ◽  
Titanium Alloys ◽  
Multiaxial Fatigue

scholarly journals Multiaxial Fatigue Strength to Notched specimens made of 40CrMoV13.9

2016 ◽  
Vol 9 (4) ◽  
pp. 1269-1291 ◽  
Author(s):  
Filippo Berto ◽  
Abedin Gagani ◽  
Raffaella Aversa ◽  
Relly Victoria V. Petrescu ◽  
Antonio Apicella ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Multiaxial Fatigue ◽  
Notched Specimens

The effect of some technological factors on the fatigue strength of titanium alloys

1971 ◽  
Vol 3 (8) ◽  
pp. 963-967 ◽  
Author(s):  
D. Ya. Bragin ◽  
N. Z. Loginov ◽  
I. N. Shkanov
Keyword(s):  
Fatigue Strength ◽  
Titanium Alloys ◽  
Technological Factors

Spectral Fatigue Analysis of Plate Surface Hot-Spots: A Practical Solution to the Stress Direction Issue

2020 ◽  
Author(s):  
Fabien Bigot ◽  
Stéphanie Mougin
Keyword(s):  
Finite Element ◽  
Spectral Analysis ◽  
Fatigue Strength ◽  
Plane Stress ◽  
Hot Spots ◽  
Fatigue Analysis ◽  
Multiaxial Fatigue ◽  
The Other ◽  
Plate Surface ◽  
Practical Solution

Abstract Spectral Fatigue Analysis using coupled hydrodynamics and finite element models has now become a common practice for the fatigue strength assessment of offshore units, with established procedures given in Classification Rules. However, users are facing a practical issue that is almost never mentioned in the procedures. Indeed, many fatigue hot-spots are located on a plate surface, as opposed to plate edges. For such hot-spots, the finite element model results are the three components of the plane-stress stress tensor. Therefore, the outcome of the Spectral Fatigue Analysis is a set of three transfer functions (RAOs). On the other hand, our industry’s practice regarding the fatigue strength model is still the proven « design S-N curve » approach in combination with the Palmgren-Miner’s damage summation. As a consequence, today the engineer is left with no clear instruction about the proper way how to close this gap between the three stress RAOs on the one hand, and the single stress S-N curve on the other hand. If any advice is given, it is most often to consider the principal stresses, tentatively extending to spectral analysis the classification rule load cases approach. However, principal stress determination is a non-linear procedure that is not compatible with spectral analysis in frequency domain. Turning the spectral results into time domain to overcome this limitation is extremely costly and is not straightforward. Of course, a rational solution to this issue would be the adoption of a multiaxial fatigue damage criteria in lieu of the uniaxial S-N curve. But until such a multiaxial fatigue criteria is widely accepted in our industry, users have to square the circle, and force their stress tensor RAOs into the existing rule criteria. In this paper, a practical solution to reconcile plane stress results and conventional S-N curve criterion in spectral fatigue is proposed: the “facet approach “.

scholarly journals Hydrogen-enabled microstructure and fatigue strength engineering of titanium alloys

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
James D. Paramore ◽  
Zhigang Zak Fang ◽  
Matthew Dunstan ◽  
Pei Sun ◽  
Brady G. Butler
Keyword(s):  
Fatigue Strength ◽  
Titanium Alloys
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