scholarly journals Fatigue. Effect of Variable Stress Amplitude on Fretting Fatigue Crack Initiation at Press-Fitted Axle Assembly. Effects of Stress Cycle Ratio, Number of Load Levels and Axle Size.

1997 ◽  
Vol 46 (10) ◽  
pp. 1178-1183 ◽  
Author(s):  
Taizo MAKINO ◽  
Miyuki YAMAMOTO ◽  
Kenji HIRAKAWA
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Stress Amplitude ◽  
Fatigue Crack Initiation ◽  
Fretting Fatigue ◽  
Stress Cycle ◽  
Fatigue Effect ◽  
Effects Of Stress

Fatigue Crack Initiation in Solder Joints

1996 ◽  
Vol 118 (2) ◽  
pp. 41-44 ◽  
Author(s):  
Z. Zhang ◽  
Daping Yao ◽  
J. K. Shang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Crack ◽  
Crack Initiation ◽  
Solder Joints ◽  
Fatigue Crack Initiation ◽  
Lap Joints ◽  
Stress Cycle ◽  
Fatigue Lifetime ◽  
Peak Value

A backface strain technique is introduced to examine fatigue crack initiation in solder lap joints. The technique detects the fatigue crack initiation by monitoring the backface strain at the end of the overlap. Variation of the backface strain with the development of a crack was simulated by finite element method. The simulation indicated that the backface strain at the end of the overlap reached a peak value when a fatigue crack initiated. Experimental verification was carried out in 63Sn-37Pb solder joints. The backface strain was recorded as a function of stress cycle to demonstrate the applicability of this technique. Experimental results showed that fatigue crack initiation took about half of the fatigue lifetime of the solder joints.

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