What is the best method to machine a notch on a compact tension specimen (steel) used for fatigue crack growth rate testing?

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Shiv Sahaya Shukla

Dear Rashiga Walallawita as per my experience, wire EDM technique having 0.25 mm wire diameter works great in creating a sharp notch. As per ASTM E647, notch should have included notch angle 30 degree and 3 mm width.

Wire-EDM should be used to get a sharp notch in metallic specimens. A good sharp notch facilitates rapid precracking of the CT specimen.

Rashiga Walallawita

Hello Shiv Sahaya Shukla , thank you for your suggestion. Unfortunately I do not have a wire EDM facility. Do you have any other, suggestions?