Mechanical behaviors of electron beam welded titanium alloy up to very high cycle fatigue under different process conditions

2021 ◽  
Vol 802 ◽  
pp. 140685
Author(s):  
Yongjie Liu ◽  
Fulin Liu ◽  
Ruixiang He ◽  
Qingyuan Wang ◽  
Chong Wang ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
High Cycle Fatigue ◽  
Process Conditions ◽  
Cycle Fatigue ◽  
Mechanical Behaviors ◽  
Very High Cycle Fatigue ◽  
Very High

scholarly journals Internal crack characteristics in very-high-cycle fatigue of a gradient structured titanium alloy

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Xiangnan Pan ◽  
Guian Qian ◽  
Shengchuan Wu ◽  
Yanan Fu ◽  
Youshi Hong
Keyword(s):  
Titanium Alloy ◽  
High Cycle Fatigue ◽  
Internal Crack ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High

scholarly journals Influence of defects on the very high cycle fatigue behaviour of forged aeronautic titanium alloy

2014 ◽  
Vol 12 ◽  
pp. 10004
Author(s):  
Alexander Nikitin ◽  
Thierry Palin-Luc ◽  
Andrey Shanyavskiy ◽  
Claude Bathias
Keyword(s):  
Titanium Alloy ◽  
High Cycle Fatigue ◽  
Fatigue Behaviour ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High

scholarly journals Effect of LCF Pre-Damage on Very High Cycle Fatigue Behavior of TC21 Titanium Alloy

2017 ◽  
Author(s):  
Nie Baohua ◽  
Zhao Zihua ◽  
Ouyang Yongzhong ◽  
Chen Dongchu ◽  
Chen Hong ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Crack Initiation ◽  
High Cycle Fatigue ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Fatigue Crack Initiation ◽  
Mechanism Analysis ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High

The effect of low cycle fatigue (LCF) pre-damage on the subsequent very high cycle fatigue (VHCF) behavior is investigated in TC21 titanium alloy. LCF pre-damage is applied under 1.8% strain amplitude up to various fractions of the expected life and subsequent VHCF properties are determined using ultrasonic fatigue tests. Results show that 5% of LCF pre-damage insignificantly affects the VHCF limit due to the absent of pre-crack, but decreases the subsequent fatigue crack initiation life estimated by Pairs’ law. Pre-cracks introduced by 10% and 20% of LCF pre-damage significantly reduce the subsequent VHCF limits. The crack initiation site shifts from subsurface-induced fracture for undamaged and 5% of LCF pre-damage specimens to surface pre-crack for 10% and 20% of LCF pre-damage specimens in very high cycle region. The fracture mechanism analysis indicate that LCF pre-crack will re-start to propagate under subsequently low stress amplitude when stress intensity factor of pre-crack is larger than its threshold. Furthermore, the predicted fatigue limits based on EI Haddad model for the LCF pre-damage specimens well agree with the experimental results.

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