Application of the dc potential drop technique in investigating crack initiation and propagation under sustained load in notched rupture tests

1988 ◽  
Vol 19 (4) ◽  
pp. 863-871 ◽  
Author(s):  
I. P. Vasatis ◽  
R. M. Pelloux
Keyword(s):  
Crack Initiation ◽  
Potential Drop ◽  
Sustained Load ◽  
Crack Initiation And Propagation ◽  
Initiation And Propagation ◽  
Dc Potential ◽  
Drop Technique

Propagation of Fatigue Cracks in Notched Specimens of EN AW 7475-T761

2013 ◽  
Vol 592-593 ◽  
pp. 789-792 ◽  
Author(s):  
Jürgen Bär ◽  
Gero Wilhelm
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Cracks ◽  
Fatigue Crack Initiation ◽  
Potential Drop ◽  
Crack Initiation And Propagation ◽  
Notched Specimens ◽  
Initiation And Propagation ◽  
Dc Potential ◽  
Base Load

The influence of single overloads on the fatigue crack initiation and propagation of an EN AW 7475-T761 alloy was investigated using SEN-specimens. Into a base load with an amplitude of 80 MPa and an Rvalue of R=-1 tension compression overloads with an amplitude of 240 MPa have been introduced every 10,000 cycles. The crack length was measured with a DC-Potential drop method. The experiments have shown that cracks are initiated in the first 5% of the total lifetime and, therefore, the cyclic lifetime is dominantly determined by crack propagation. The investigation of the crack surfaces exhibit that a different number of individual cracks propagates within the specimens. The differences in the cyclic lifetimes indicate that the interaction between these cracks directly influences the cyclic lifetime. This shows that the differences in the crack propagation behaviour are responsible for the scatter of the determined cyclic lifetimes.

The Influence of Copper Addition on Crack Initiation and Propagation in an Al-Si-Mg Alloy During Cyclic Testing

2020 ◽  
Author(s):  
Toni Bogdanoff ◽  
Lucia Lattanzi ◽  
Mattia Merlin ◽  
Ehsan Ghassemali ◽  
Salem Seifeddine
Keyword(s):  
Crack Initiation ◽  
Mg Alloy ◽  
Cyclic Testing ◽  
Crack Initiation And Propagation ◽  
Copper Addition ◽  
Initiation And Propagation
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