Effect of strain ratio and strain rate on low cycle fatigue behavior of AZ31 wrought magnesium alloy

2009 ◽  
Vol 517 (1-2) ◽  
pp. 334-343 ◽  
Author(s):  
S. Begum ◽  
D.L. Chen ◽  
S. Xu ◽  
Alan A. Luo
Keyword(s):  
Magnesium Alloy ◽  
Strain Rate ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Strain Ratio ◽  
Cycle Fatigue ◽  
Wrought Magnesium Alloy

Research on Low Cycle Fatigue Behavior and Life Prediction of Magnesium Alloy AZ91D

2012 ◽  
Vol 482-484 ◽  
pp. 575-580 ◽  
Author(s):  
Chong You Feng ◽  
Xing Guo Wang ◽  
Pu Hong Tang
Keyword(s):  
Fatigue Life ◽  
Magnesium Alloy ◽  
Strain Rate ◽  
Strain Amplitude ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Control Variable ◽  
Great Influence ◽  
Cycle Fatigue ◽  
Az91d Magnesium Alloy

Strain rate change tests were performed under uniaxial tension-compress cycle loading during low cycle fatigue of AZ91D magnesium alloy using plastic strain as the control variable. Results show that the cyclic softening phenomenon is appeared in testing materials when cycle strain amplitude is less than 0.4%. With the increase of the cyclic strain amplitude, material displays obviously cyclic hardening; at the same time, the additional strengthening degree of materials is increased. Further study found that the slope of the curve is unchanged when the strain amplitude is more than 1.0%. The changes of strain rate has a little impact on the low cycle fatigue life of AZ91D magnesium alloy, conversely, the changes of strain amplitude has a great influence on low cycle fatigue life on the material. With the improvement of strain amplitude, fatigue life is reduced obviously. In addition, the Coffin-Manson formula fitting equation has good consistency with the experimental data, which is used in low cycle fatigue prediction life.

Effects of strain rate on the low cycle fatigue behavior of AZ31B magnesium alloy processed by SMAT

2018 ◽  
Vol 735 ◽  
pp. 536-546 ◽  
Author(s):  
Gang Chen ◽  
Jianwen Gao ◽  
Yun Cui ◽  
Hong Gao ◽  
Xiang Guo ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Strain Rate ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue ◽  
Az31b Magnesium Alloy

The Effect of Nitrogen Alloying on the Low Cycle Fatigue and Creep-Fatigue Interaction Behavior of 316LN Stainless Steel

2013 ◽  
Vol 794 ◽  
pp. 441-448 ◽  
Author(s):  
G.V. Prasad Reddy ◽  
R. Sandhya ◽  
M.D. Mathew ◽  
S. Sankaran
Keyword(s):  
Stainless Steel ◽  
Strain Rate ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Hold Time ◽  
Cyclic Plasticity ◽  
Dynamic Strain ◽  
Cycle Fatigue ◽  
Intergranular Cracking ◽  
Creep Fatigue

Low cycle fatigue (LCF) and Creep-fatigue interaction (CFI) behavior of 316LN austenitic stainless steel alloyed with 0.07, 0.11, 0.14, .22 wt.% nitrogen is briefly discussed in this paper. The strain-life fatigue behavior of these steels is found to be dictated by not only cyclic plasticity but also by dynamic strain aging (DSA) and secondary cyclic hardening (SCH). The influence of the above phenomenon on cyclic stress response and fatigue life is evaluated in the present study. The above mentioned steels exhibited both single-and dual-slope strain-life fatigue behavior depending on the test temperatures. Concomitant dislocation substructural evolution has revealed transition in substructures from planar to cell structures justifying the change in slope. The beneficial effect of nitrogen on LCF life is observed to be maximum for 316LN with nitrogen in the range 0.11 - 0.14 wt.%, for the tests conducted over a range of temperatures (773-873 K) and at ±0.4 and 0.6 % strain amplitudes at a strain rate of 3*10-3 s-1. A decrease in the applied strain rate from 3*10-3 s-1 to 3*10-5 s-1 or increase in the test temperature from 773 to 873 K led to a peak in the LCF life at a nitrogen content of 0.07 wt.%. Similar results are obtained in CFI tests conducted with tensile hold periods of 13 and 30 minutes. Fractography studies of low strain rate and hold time tested specimens revealed extensive intergranular cracking.

scholarly journals Low Cycle Fatigue Behavior of AZ91D Magnesium Alloy Containing Rare-Earth Ce Element

2012 ◽  
Vol 27 ◽  
pp. 1794-1800 ◽  
Author(s):  
Qunqiang Fu ◽  
Yesheng Li ◽  
Ganwei Liu ◽  
Hong Li
Keyword(s):  
Rare Earth ◽  
Magnesium Alloy ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue ◽  
Az91d Magnesium Alloy

scholarly journals Effect of Strain Rate on the Low Cycle Fatigue Behavior of 316L(N) Stainless Steel Weld Joints

2013 ◽  
Vol 55 ◽  
pp. 176-180 ◽  
Author(s):  
Sayan Kalyan Chandra ◽  
Vani Shankar ◽  
K. Mariappan ◽  
R. Sandhya ◽  
P.C. Chakraborty
Keyword(s):  
Stainless Steel ◽  
Strain Rate ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Steel Weld ◽  
Cycle Fatigue ◽  
Weld Joints ◽  
Stainless Steel Weld

2302 Low Cycle Fatigue Behavior of Extruded Magnesium Alloy

2007 ◽  
Vol 2007.1 (0) ◽  
pp. 321-322
Author(s):  
Kazuaki SHIOZAWA ◽  
Masayuki NAGAI ◽  
Tutomu MURAI ◽  
Tooru TAKAHASHI
Keyword(s):  
Magnesium Alloy ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue

Effect of Strain Rate on Low Cycle Fatigue Behavior of Thermally Aged A533B Pressure Vessel Steels in High Temperature Water

2003 ◽  
Author(s):  
Xinqiang Wu ◽  
Yasuyuki Katada
Keyword(s):  
Strain Rate ◽  
Pressure Vessel ◽  
Environmental Effect ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Aging Treatment ◽  
Cycle Fatigue ◽  
High Temperature Water ◽  
Pressure Vessel Steels ◽  
Temperature Water

Safe and reliable management of light water reactors demand a full understanding on their component materials properties throughout their service lives. In present work the effects of strain rate on low cycle fatigue behavior of ASTM A533B pressure vessel steels after long-term thermal aging at 673 K in air have been investigated in simulated BWR environments. It was found that the aging treatment led to a certain decrease in fatigue life. Environmental effect on the fatigue life of aged materials closely depended on strain rate. More strongly environmental effect appeared at low strain rate. The aging treatment enhanced the stain-rate dependence of the fatigue resistance of A533B steels. Comparison between ASME design fatigue curves and present results as well as some literatures’ data suggested that safety margins of the standard design curves tended to decrease with decrease in strain rate. Based on the above results, possible corrosion fatigue mechanisms of pressure vessel steels in high temperature water were discussed by taking into account the effects of inclusions, hydrogen embrittlement, dynamic strain aging and aging-induced material degradation as well as their combined actions.

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