Low cycle fatigue performance of ball grid array structure Cu/Sn–3.0Ag–0.5Cu/Cu solder joints

2014 ◽  
Vol 54 (12) ◽  
pp. 2911-2921 ◽  
Author(s):  
H.B. Qin ◽  
W.Y. Li ◽  
M.B. Zhou ◽  
X.P. Zhang
Keyword(s):  
Solder Joints ◽  
Low Cycle Fatigue ◽  
Ball Grid Array ◽  
Fatigue Performance ◽  
Cycle Fatigue ◽  
Array Structure

Low Cycle Fatigue Testing of Ball Grid Array Solder Joints under Mixed-Mode Loading Conditions

2004 ◽  
Vol 127 (3) ◽  
pp. 237-244 ◽  
Author(s):  
Tae-Sang Park ◽  
Soon-Bok Lee
Keyword(s):  
Fatigue Life ◽  
Mixed Mode ◽  
Room Temperature ◽  
Solder Joints ◽  
Low Cycle Fatigue ◽  
Ball Grid Array ◽  
Fatigue Tests ◽  
Test Method ◽  
Cycle Fatigue ◽  
Mixed Mode Loading

To give a proper and accurate estimation of the fatigue life of ball grid array (BGA) solder joints, a mechanical fatigue test method under mixed-mode loading is proposed. Experiments were conducted with 63Sn∕37Pb and Sn∕3.5Ag∕0.75Cu solder joints in room temperature. The mechanical low cycle fatigue tests were performed under several loading angles. The loading angle is controlled by several grips which have specific surface angle to the loading direction. Constant displacement controlled tests are performed using a micro-mechanical test apparatus. It was found that the normal deformation significantly affects the fatigue life of the solder joint. Throughout the whole test conditions at room temperature, Sn∕3.5Ag∕0.75Cu solder alloy had longer fatigue life than 63Sn∕37Pb alloy. Failure patterns of the fatigue tests were observed and discussed. A morrow energy model was examined and found to be a proper low cycle fatigue model for solder joints under mixed mode loading condition.

Low-Cycle Fatigue Performance of Buckling Restrained Braces and Assessment of Cumulative Damage under Severe Earthquakes

2018 ◽  
Vol 763 ◽  
pp. 867-874
Author(s):  
Yu Shu Liu ◽  
Ke Peng Chen ◽  
Guo Qiang Li ◽  
Fei Fei Sun
Keyword(s):  
Fatigue Life ◽  
Energy Dissipation ◽  
Structural Reliability ◽  
Low Cycle Fatigue ◽  
Engineering Application ◽  
Fatigue Performance ◽  
Cycle Fatigue ◽  
Variable Amplitude ◽  
Buckling Restrained Braces ◽  
Energy Dissipation Devices

Buckling Restrained Braces (BRBs) are effective energy dissipation devices. The key advantages of BRB are its comparable tensile and compressive behavior and stable energy dissipation capacity. In this paper, low-cycle fatigue performance of domestic BRBs is obtained based on collected experimental data under constant and variable amplitude loadings. The results show that the relationship between fatigue life and strain amplitude satisfies the Mason-Coffin equation. By adopting theory of structural reliability, this paper presents several allowable fatigue life curves with different confidential levels. Besides, Palmgren-Miner method was used for calculating BRB cumulative damages. An allowable damage factor with 95% confidential level is put forward for assessing damage under variable amplitude fatigue. In addition, this paper presents an empirical criterion with rain flow algorithm, which may be used to predict the fracture of BRBs under severe earthquakes and provide theory and method for their engineering application. Finally, the conclusions of the paper were vilified through precise yet conservative prediction of the fatigue failure of BRB.

Effect of torsional pre-strain on low cycle fatigue performance of 304 stainless steel

2019 ◽  
Vol 746 ◽  
pp. 50-57 ◽  
Author(s):  
Shengyuan Ji ◽  
Caiming Liu ◽  
Yajing Li ◽  
Shouwen Shi ◽  
Xu Chen
Keyword(s):  
Stainless Steel ◽  
Low Cycle Fatigue ◽  
Fatigue Performance ◽  
304 Stainless Steel ◽  
Cycle Fatigue
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