Coupling Geometric and Microstructure Gradients in Fatigue Crack Formation

2020 ◽  
Author(s):  
Farhan Ashraf ◽  
Andrea Cini ◽  
Gustavo M. Castelluccio
Keyword(s):  
Fatigue Crack ◽  
Crack Formation

Fatigue Crack Formation and Repair Strategies for Steel Cantilever Bracket Tie Plates

2013 ◽  
Vol 18 (6) ◽  
pp. 516-524 ◽  
Author(s):  
Clay J. Naito ◽  
Xiang Li ◽  
Ian C. Hodgson ◽  
Ben T. Yen
Keyword(s):  
Fatigue Crack ◽  
Crack Formation

The Effect of Friction Coefficient on Fretting Fatigue Cracks

2013 ◽  
Vol 690-693 ◽  
pp. 2008-2011
Author(s):  
Tao Guo ◽  
Liang Wu ◽  
Xiao Nan Liu ◽  
Ran Guo
Keyword(s):  
Fatigue Crack ◽  
Friction Coefficient ◽  
Crack Formation ◽  
Fatigue Cracks ◽  
Outer Boundary ◽  
Fatigue Loading ◽  
Fretting Fatigue ◽  
Hole Edge ◽  
Mechanics Characteristic ◽  
Paper Work

The riveting is widely used for fitting together two or more components of structure in the same or different materials. And mechanics characteristic is very complex. The paper work focus on study fretting fatigue crack formation with different friction coefficient and fatigue loading, by analyzing the stress field of upper hole edge and outer boundary of contact area. And comparing with the experimental, founding the risk point of single bolt riveted aluminum components.

scholarly journals Microscopic Multiple Fatigue Crack Simulation and Macroscopic Damage Evolution of Concrete Beam

2019 ◽  
Vol 9 (21) ◽  
pp. 4664 ◽  
Author(s):  
Baijian Wu ◽  
Zhaoxia Li ◽  
Keke Tang ◽  
Kang Wang
Keyword(s):  
Fatigue Crack ◽  
Damage Evolution ◽  
Damage Mechanics ◽  
Concrete Beam ◽  
Crack Formation ◽  
Concrete Beams ◽  
Life Assessment ◽  
Engineering Practice ◽  
Stiffness Reduction ◽  
Fatigue Rupture

Microcracks in concrete can coalesce into larger cracks that further propagate under repetitive load cycles. Complex process of crack formation and growth are essentially involved in the failure mechanism of concrete. Understanding the crack formation and propagation is one of the core issues in fatigue damage evaluation of concrete materials and components. In this regard, a numerical model was formulated to simulate the thorough failure process, ranging from microcracks growth, crack coalescence, macrocrack formation and propagation, to the final rupture. This model is applied to simulate the fatigue rupture of three-point bending concrete beams at different stress levels. Numerical results are qualitatively consistent with the experimental observations published in literature. Furthermore, in the framework of damage mechanics, one damage variable is defined to reflect stiffness reduction caused by fatigue loading. S-N curve is subsequently computed and the macroscopic damage evolution of concrete beams are achieved. By employing the combined approaches of fracture mechanics and damage mechanics, made possible is the damage evolution of concrete beam as well as the microscopic multiple fatigue crack simulation. The proposed approach has the potential to be applied to the fatigue life assessment of materials and components at various scales in engineering practice.

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