Effects of Thickness and Crystallographic Orientation on Fatigue Life of Single-Crystalline Copper Foils

This paper presented the influence of crystallographic orientation and friction coefficient on the contact stress and fatigue life in the tenon/groove contact region. A rate-dependent crystallographic plastic slip theory was used to calculate the contact stress and fatigue life in [001], [011] and [111] orientations. In the calculation, complex loading conditions and different friction coefficients of 0, 0.2, 0.4, 0.6, 0.8 and 1.0 were taken into account in tenon/groove. Then the relationship between contact stress, fatigue life and friction coefficient was discussed. Simulation results show that: friction coefficient and crystallographic orientation have significant effect on contact stress and fatigue life. Contact stress in [001], [011] and [111] orientation increases with increasing friction coefficient generally. For [001] and [011] orientation, the fatigue life decreases with increasing friction coefficient firstly. When friction coefficient is 0.4, the fatigue life meets its minimum. Then the fatigue life will increase with increasing friction coefficient. For [111] orientation, the change of fatigue life has no obvious trend, and while friction coefficient exceeds 0.6, the life almost constant.

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Towards the Development of a Physics-Based Thermo-Mechanical Fatigue Life Prediction Model for a Single Crystalline Ni-Base Superalloy

Materials Performance and Characterization ◽

10.1520/mpc20130049 ◽

2014 ◽

Vol 3 (2) ◽

pp. 20130049 ◽

Cited By ~ 1

Author(s):

Robert L. Amaro ◽

Stephen D. Antolovich ◽

Richard W. Neu ◽

Benjamin S. Adair ◽

Michael R. Hirsch ◽

...

Keyword(s):

Fatigue Life ◽

Prediction Model ◽

Life Prediction ◽

Fatigue Life Prediction ◽

Single Crystalline ◽

Mechanical Fatigue ◽

Base Superalloy ◽

Life Prediction Model

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Investigating the role of crystallographic orientation of single crystalline silicon on their electrochemical lithiation behavior: Surface chemistry of Si determines the bulk lithiation

Surfaces and Interfaces ◽

10.1016/j.surfin.2020.100585 ◽

2020 ◽

Vol 20 ◽

pp. 100585

Author(s):

Kanchan Mala ◽

Malik Wahid ◽

S.W. Gosavi ◽

S.I. Patil ◽

Suhas M. Jejurikar

Keyword(s):

Surface Chemistry ◽

Crystallographic Orientation ◽

Crystalline Silicon ◽

Single Crystalline Silicon ◽

Single Crystalline ◽

Electrochemical Lithiation

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A Comparative Study on Fatigue Response of Aluminum Alloy Friction Stir Welded Joints at Various Post-Processing and Treatments

Journal of Manufacturing and Materials Processing ◽

10.3390/jmmp5030093 ◽

2021 ◽

Vol 5 (3) ◽

pp. 93 ◽

Cited By ~ 1

Author(s):

Soran Hassanifard ◽

Ahmad Varvani-Farahani

Keyword(s):

Fatigue Life ◽

Welded Joints ◽

Solution Treatment ◽

Welding Process ◽

Rolling Process ◽

Alumina Powder ◽

Post Processing ◽

Friction Stir ◽

Copper Foils

The present study examines the fatigue of friction stir welded (FSW) aluminum 6061, 7075, 1060 joints followed by (i) in situ and sequential rolling (SR) processes, (ii) plastic burnishing (iii) solution-treatment artificial aging (STA), (iv) local alloying through depositing thin copper foils, and (v) inserting alumina powder in the weld nugget zone (NZ). The microstructural features and fatigue life of post-processed joints were compared with those of as-welded joints. The in situ rolling technique offered simultaneous rolling and welding operations of aluminum joints, while through the sequential rolling process, the top surface of FSW joints was rolled after the welding process. The fatigue life of in situ rolled samples was increased as the ball diameter of welding tool increased. The fatigue life of friction stir welded joints after a low-plasticity burnishing process was noticeably promoted. The addition of 1 wt.% alumina in the NZ of joints resulted in a significant elevation on fatigue life of friction stir spot welded joints, while an increase in alumina powder to 2.5 wt.% adversely affected fatigue strength. Weld NZ was alloyed through the insertion of copper foils between the faying surfaces of joints. This localized alloy slightly improved the fatigue life of joints; however, its effects on fatigue life were not as influential as STA heat-treated or in situ rolled joints. The microstructure of weld joints was highly affected through post-processing and treatments, resulting in a substantial influence on the fatigue response of FSW aluminum joints.

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