Life prediction method of copper thin film repaired by laser irradiation based on healing variable

2016 ◽  
Vol 26 (7) ◽  
pp. 1028-1042 ◽  
Author(s):  
Chong-Gang Ren ◽  
De-Guang Shang
Keyword(s):  
Laser Irradiation ◽  
Life Prediction ◽  
Copper Film ◽  
Prediction Method ◽  
Cyclic Stress ◽  
Notched Specimens ◽  
Constitutive Relationships ◽  
Irradiation Treatment ◽  
Before And After ◽  
Good Agreement

The cyclic stress–strain constitutive relationships for copper film smooth specimens with different damage degrees before and after laser irradiation treatment were investigated. Compared with the changes of the constitutive relationships under different damage degrees, a healing variable for the repaired copper film by laser irradiation was defined. Based on the analysis of the healing variable, a fatigue life prediction method was proposed. The experimental lives of the damaged notched specimens after laser irradiation treatment were used to verify the proposed life prediction method. The results showed that the predicted lives are in good agreement with the experimental results.

Heat Transfer in Two-Dimensional Turbulent Confined Flows

1972 ◽  
Vol 186 (1) ◽  
pp. 625-633
Author(s):  
A. P. Hatton ◽  
N. H. Woolley
Keyword(s):  
Prediction Method ◽  
Eddy Diffusivity ◽  
Reynolds Numbers ◽  
Turbulence Energy ◽  
Two Dimensional ◽  
Narrow Angle ◽  
Before And After ◽  
Dimensional Equation ◽  
Confined Flows ◽  
Good Agreement

Measurements of displacement and momentum thickness, friction factor and Stanton number were made in a narrow angle diverging duct consisting of two plane walls, width 0·82 m. The height of the duct varied from 0·051 to 0·152 m over a length of 3·94 m. Reynolds numbers ranged from 8·7 × 104 to 20·7 × 104. The results are compared with a prediction method using a numerical solution of the two-dimensional equation of motion and energy. An eddy diffusivity hypothesis was used, based on the turbulence energy equation and an empirical length scale distribution. Good agreement was obtained between the theoretical and experimental results, both before and after the boundary layers interfered, and with previously reported experiments in a parallel duct. It was necessary to change the value of one of the constants in the analysis for each geometry.

A fatigue life prediction method from magnetic pole material to simulation part

2019 ◽  
Vol 28 (9) ◽  
pp. 1438-1454 ◽  
Author(s):  
Long Pan ◽  
Jian Chao Pang ◽  
Yu Jun Xie ◽  
Meng Xiao Zhang ◽  
Liang Liang Nie ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Prediction Method ◽  
Fatigue Life Prediction ◽  
Sensitivity Factor ◽  
Magnetic Pole ◽  
Element Analysis ◽  
Fatigue Notch Factor ◽  
Effect Of Surface ◽  
Good Agreement

Due to the higher reliability needs of the large moving component motor-generator rotor, the assessment of the service life has drawn more and more attention. After finite element analysis of the rotor, the simulation part which can represent the magnetic pole with the most dangerous position of the rotor was designed to investigate the S–N curves. Compared with the conventional specimen, considering the main influencing factors of fatigue life for simulation part, the comprehensive factor was proposed to establish the fatigue life relationship between magnetic pole material and simulation part. It was found that the calculation method of fatigue notch factor based on the notch sensitivity factor is relatively simple and practical, and there is no significant effect of surface roughness on high and low cycle fatigues for low roughness ( R a is about 1 µm), and the dimension factor changes linearly with the scale factor. Based on those results, a fatigue life prediction method was proposed and validated, and the predicted results were in good agreement with the experimental data. This study will provide a reasonable reference to determine the fatigue life prediction of large moving components.

Recovery of Fatigue Damage and Life Prediction by Laser Irradiation Healing Treatment for Copper Film

2014 ◽  
Vol 24 (1) ◽  
pp. 106-113
Author(s):  
Yu-Bo Guo ◽  
De-Guang Shang ◽  
Xiao-Dong Liu ◽  
Chong-Gang Ren ◽  
Feng-Zhu Liu ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Fatigue Damage ◽  
Life Prediction ◽  
Copper Film

Fatigue life prediction of damaged copper film by laser irradiation repairing

2014 ◽  
Vol 38 (3) ◽  
pp. 330-339 ◽  
Author(s):  
C.-G. Ren ◽  
D.-G. Shang ◽  
Y.-J. Sun ◽  
Y.-B. Guo ◽  
T. Chen
Keyword(s):  
Fatigue Life ◽  
Laser Irradiation ◽  
Life Prediction ◽  
Copper Film ◽  
Fatigue Life Prediction

A Physical Model for Self-Emitting Magnetic Signals during Fatigue Crack Propagation

2012 ◽  
Vol 190-191 ◽  
pp. 415-418 ◽  
Author(s):  
Li Hong Dong ◽  
Bin Shi Xu ◽  
Hui Peng Wang ◽  
Nan Xue
Keyword(s):  
Fatigue Crack ◽  
Physical Model ◽  
Life Prediction ◽  
Magnetic Charge ◽  
Normal Component ◽  
Fatigue Tests ◽  
The Self ◽  
Before And After ◽  
Good Agreement ◽  
Peak Value

It has previously been reported that when a fatigue crack grows in ferromagnetic materials, abnormal magnetic signals are spontaneously emitted, which can provide a powerful tool for fatigue crack life prediction. However, there is no physical model yet available to explain the mechanism for the formation of these self-emitting magnetic signals. In the present research, tension-tension fatigue tests of center-cracked sheet specimens were performed. The variations in the normal component of the self-emitting magnetic signals, Hp(y), on the surfaces of the specimens were measured during the fatigue test. The differences in peak-to-peak value, Hp(y), before and after failure of a specimen, were characterized. Consequently, a physical model based on magnetic charge was proposed, which was in good agreement with the experimental results. The model is helpful for understanding the inherent mechanism of the self-emitting magnetic signals.

The Precipitation of Si in AlCuSi Thin Films

1973 ◽  
Vol 31 ◽  
pp. 34-35 ◽  
Author(s):  
R. M. Anderson
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Heat Treatment ◽  
Solid Solution ◽  
Integrated Circuit ◽  
Copper Film ◽  
Solution Concentration ◽  
X Ray ◽  
Silicon Thin Films ◽  
Before And After

Aluminum-copper-silicon thin films have been considered as an interconnection metallurgy for integrated circuit applications. Various schemes have been proposed to incorporate small percent-ages of silicon into films that typically contain two to five percent copper. We undertook a study of the total effect of silicon on the aluminum copper film as revealed by transmission electron microscopy, scanning electron microscopy, x-ray diffraction and ion microprobe techniques as a function of the various deposition methods.X-ray investigations noted a change in solid solution concentration as a function of Si content before and after heat-treatment. The amount of solid solution in the Al increased with heat-treatment for films with ≥2% silicon and decreased for films <2% silicon.

scholarly journals Impedance Spectroscopy of Lead-Free Ferroelectric Coatings

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 221
Author(s):  
Mariya Aleksandrova ◽  
Ivailo Pandiev
Keyword(s):  
Composite Coatings ◽  
Electrical Circuit ◽  
Ferroelectric Materials ◽  
Piezoelectric Transducers ◽  
Lead Free ◽  
Electrical Behavior ◽  
Oxide Composite ◽  
Before And After ◽  
Frequency Dependences ◽  
Good Agreement

This paper presents impedance measurements of ferroelectric structures involving lead-free oxide and polymer-oxide composite coatings for sensing and energy harvesting applications. Three different ferroelectric materials grown by conventional microfabrication technologies on solid or flexible substrates are investigated for their basic resonant characteristics. Equivalent electrical circuit models are applied to all cases to explain the electrical behavior of the structures, according to the materials type and thickness. The analytical results show good agreement with the experiments carried out on a basic types of excited thin-film piezoelectric transducers. Additionally, temperature and frequency dependences of the dielectric permittivity and losses are measured for the polymer-oxide composite device in relation with the surface morphology before and after introduction of the polymer to the functional film.

Hybrid remaining useful life prediction method. A case study on railway D-cables

2021 ◽  
pp. 107746
Author(s):  
Yu Zang ◽  
Wei Shangguan ◽  
Baigen Cai ◽  
Huasheng Wang ◽  
Michael. G. Pecht
Keyword(s):  
Life Prediction ◽  
Prediction Method ◽  
Remaining Useful Life ◽  
Useful Life
Sign in / Sign up

Export Citation Format

Share Document