scholarly journals Initiation and growth behavior of very-long microstructurally short fatigue cracks

2013 ◽  
Vol 7 (25) ◽  
pp. 138-144 ◽  
Author(s):  
P. Lorenzino ◽  
A. Navarro
Keyword(s):  
Fatigue Cracks ◽  
Growth Behavior

Fatigue Crack Growth of LC9 Aluminum Alloy under Flying Loading with Corrosion Damage

2014 ◽  
Vol 488-489 ◽  
pp. 66-69
Author(s):  
Xu Dong Li ◽  
Zeng Jie Cai ◽  
Zhi Tao Mu
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Fatigue Cracks ◽  
Corrosion Damage ◽  
Growth Behavior ◽  
Transport Aircraft ◽  
Suitable Parameter ◽  
Corrosion Pits

This paper investigates the growth behavior of fatigue cracks initiated at corrosion pits in laboratory coupons of LC9 aluminum alloy subjected to a transport aircraft loading spectrum. Corrosion pits were introduced by exposing the coupons to EXCO solution for a variety of periods to produce corrosion damage varying from mild to severe. In general, the presence of corrosion damage reduced the fatigue lives of components to a severe extent. It was found that the depth of the corrosion pit was a suitable parameter for characterizing the corrosion damage and for predicting the fatigue life of the coupons using commercial fatigue crack growth software

scholarly journals Influence of Microstructures on the Crack Growth Behavior of Small Fatigue Cracks in Squeeze-Cast Aluminium Alloys.

1994 ◽  
Vol 60 (570) ◽  
pp. 358-363 ◽  
Author(s):  
Norio Kawagoishi ◽  
Hironobu Nisitani ◽  
Toshinobu Toyohiro ◽  
Naomichi Yamamoto ◽  
Tohru Tsuno
Keyword(s):  
Crack Growth ◽  
Aluminium Alloys ◽  
Fatigue Cracks ◽  
Growth Behavior ◽  
Crack Growth Behavior ◽  
Squeeze Cast ◽  
Cast Aluminium

Growth behavior of short surface fatigue cracks in 2 1/4 Cr-1 Mo steel

KSME Journal ◽  
1989 ◽  
Vol 3 (2) ◽  
pp. 78-85 ◽  
Author(s):  
Chang Min Suh ◽  
Robert O. Ritchie ◽  
Young Goo Kang
Keyword(s):  
Fatigue Cracks ◽  
Growth Behavior ◽  
Surface Fatigue

scholarly journals Growth behavior of fatigue cracks in ultrafine grained Cu smooth specimens with a small hole

2015 ◽  
Author(s):  
Masahiro Goto ◽  
Kakeru Morita ◽  
Junichi Kitamura ◽  
Takaei Yamamoto ◽  
Masataka Baba ◽  
...  
Keyword(s):  
Fatigue Cracks ◽  
Maximum Shear Stress ◽  
High Stress ◽  
Crack Tip ◽  
Shear Plane ◽  
Growth Behavior ◽  
Shear Mode ◽  
Aspect Ratios ◽  
Ultrafine Grained ◽  
Loading Axis

In order to study the growth mechanism of fatigue cracks in ultrafine grained copper, stresscontrolled fatigue tests of round-bar specimens with a small blind hole as a crack starter were conducted. The hole was drilled on the surface where an intersection between the shear plane of the final ECAP processing and the specimen surface makes an angle of 45° or 90° with respect to the loading axis. At a low stress ( ? a = 90 MPa), the direction of crack paths was nearly perpendicular to the loading direction regardless of the location of the hole. Profile of crack face was examined, showing the aspect ratio (b/a) of b/a = 0.82. At a high stress ( ? a = 240 MPa), although the growth directions inclined 45° and 90° to the loading-axis were observed depending on the location of the drilling hole, crack faces in these cracks were extended along one set of maximum shear stress planes, corresponding to the final ECAP shear plane. The value of aspect ratios was b/a = 0.38 and 1.10 for the cracks with 45° and 90° inclined path directions, respectively. The role of deformation mode at the crack tip areas on crack growth behavior were discussed in terms of the mixed-mode stress intensity factor. The crack path formation at high stress amplitudes was affected by the in-plane shear-mode deformation at the crack tip.

Fatigue crack growth behavior of rib-to-deck double-sided welded joints of orthotropic steel decks

2020 ◽  
pp. 136943322096175
Author(s):  
Yang Liu ◽  
Fanghuai Chen ◽  
Da Wang ◽  
Naiwei Lu
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Crack Growth ◽  
Welded Joints ◽  
Mixed Mode ◽  
Fatigue Cracks ◽  
Growth Behavior ◽  
Crack Growth Behavior ◽  
Fatigue Crack Growth Behavior ◽  
Orthotropic Steel Decks

Innovative double-sided welding is expected to improve the fatigue resistance of rib-to-deck welded joints of orthotropic steel decks (OSDs). Welding crack-like defects are the crucial issue affecting the fatigue performance of rib-to-deck double-sided welded joints. This study presents a numerical simulation of three-dimensional (3D) mixed mode fatigue crack growth behavior of rib-to-deck double-sided welded joints of OSDs. Maximum tensile stress theory and equivalent stress intensity factor (SIF) were used to simulate mixed mode fatigue cracks growth. The Paris law model was employed to predict the fatigue life. Fatigue cracks of rib-to-deck double-sided welded joints were characterized by the presence of mixed mode cracks of modes I (open), mode II (shear), and mode III (tear), which was dominated by mode I. The equivalent SIF was found to be complex at the growth stage with the maximum value at the two ends of the crack front and the minimum value at the midpoint of the crack front. The crack shape became flatter in the later phase of the crack growth. The fatigue crack surface underwent deflections during crack growth, making the final crack shape exhibiting the characteristic of a spatial curved surface. The initial crack geometry showed a significant impact on the fatigue life.

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