scholarly journals Effect of Rolling Direction on Fatigue Crack Propagation in Pure Titanium Film

2017 ◽  
Vol 66 (12) ◽  
pp. 921-927
Author(s):  
Kenichi SHIMIZU ◽  
Fumiya SAKATA
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Rolling Direction ◽  
Pure Titanium ◽  
Titanium Film

scholarly journals Cyclic Deformation Behavior and Fatigue Crack Propagation of Low Carbon Steel Prestrained in Tension

2009 ◽  
Vol 2009 ◽  
pp. 1-4
Author(s):  
J. G. Wang ◽  
W. P. Jia ◽  
D. Y. Ju
Keyword(s):  
Fatigue Crack ◽  
Carbon Steel ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Axial Stress ◽  
Rolling Direction ◽  
Low Carbon Steel ◽  
Cyclic Softening ◽  
Low Carbon ◽  
Deformation Degree

The tests were performed on low carbon steel plate. In the tension fatigue tests, two angle values (ϕ=0°andϕ=45°,ϕis the angle between the loading and the rolling direction) have been chosen. The influence of strain path change on the subsequent initial work softening rate and the saturation stress has been investigated. Dislocation microstructure was observed by transmission electron microscopy. It was found that the strain amount of preloading in tension has obviously affected the cyclic softening phenomenon and the initial cyclic softening rate. It was observed that the reloading axial stress forϕ=45°case increased more than that ofϕ=0°case, due to the anisotropism of Q235. In the fatigue crack propagation tests, the experimental results show that with increasing the pretension deformation degree, the fatigue crack growth rate increases, especially at the near threshold section.

Crystallographic Orientation Dependence of Fatigue Crack Propagation Behavior in Rolled AZ31 Magnesium Alloy

2010 ◽  
Vol 654-656 ◽  
pp. 723-726 ◽  
Author(s):  
Shigeki Morita ◽  
Nobuyoshi Ohno ◽  
Fujio Tamai ◽  
Yuji Kawakami
Keyword(s):  
Fatigue Crack ◽  
Magnesium Alloy ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Transverse Direction ◽  
Rolling Direction ◽  
Crack Propagation Rate ◽  
Fatigue Crack Propagation Behavior ◽  
Propagation Behavior ◽  
Crack Propagation Behavior

This paper deals with fatigue crack propagation behavior of rolled AZ31B magnesium alloy. Two types of specimens with the loading axis parallel to rolling direction were machined; fatigue crack propagation direction was parallel to transverse direction (L-T specimen), and short transverse direction (L-S specimen). Fatigue crack propagation tests were performed with center cracked plate tension specimen with stress ratio R=0.1 and frequency of 10Hz at room temperature. Crack propagation rate of L-T specimen was approximately 10 times higher than that of L-S specimen. SEM-EBSD observations revealed that the c-axis direction is unfavorable for the fatigue crack propagation in textured polycrystalline magnesium alloy.

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