Generally in fracture test pre cracking takes some time which depends on materials but in my case the pre cracking of an Al alloy sample with square notch is completing very soon like in 10 minutes ,why its happening? Is this due to the square shape notch or any other reason?
Dear Nidhi Chaubey
The square notch you mentioned might be providing a stress concentration that leads to accelerated crack propagation. If the square notch geometry creates a more severe stress concentration compared to other notch shapes, the crack might propagate more rapidly.
Nidhi Chaubey, Yes, the shape of the notch can affect the fracture test result. This is because the shape of the notch affects the stress concentration at the crack tip. A sharper notch will have a higher stress concentration, which will lead to a lower fracture toughness. A square notch is sharper than a round notch, so it would be expected to have a lower fracture toughness. However, there are a number of other factors that can affect the fracture toughness of a material, such as the microstructure of the material, the loading rate, and the temperature. It is possible that the square notch is causing the pre-cracking to occur more quickly because it is a sharper notch. However, it is also possible that other factors are contributing to the rapid pre-cracking, such as the microstructure of the aluminum alloy or the loading rate.
The answer depends on the shape of the sample. Different options are possible
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