"Crack arrest" in fracture mechanics 1

[dsebastianbach]

Hi, I want to know if the fracture mechanics "crack arrest" concept is a property of the material or it depends on other factors, and if the "pop-in" shown by the fracture mechanics tests specimens just before they break has something in common with the crack arrest?

Thanks.

 

[metengr]

What is the reason for your question? Normally, crack arrest is used in dynamic fracture conditions versus static fracture conditions (like KIc). Dynamic fracture testing can be instrumented Charpy V-notch, drop weight tear testing and the explosive bulge test. The results from these tests are used to qualitatively define a minimum crack arrest temperature.

Qualitative tests as mentioned above are not a specific material property parameter, because the tests depend on stress conditions, and loading rate. These tests do allow one to characterize the fracture behavior under dynamic loading conditions in service.