In the automotive and aerospace industries, fatigue is often interpreted to mean the number of cycles that can be applied to a material before a crack occurs. Once a crack has been detected the discipline of fracture mechanics is then applied. For example, once a crack has occurred, how quickly does it grow? What are the number of cycles required to propagate the crack failure and what energy is required to fail the cracked specimen?
The fixture shown was designed for a 0.5 inch CT specimen made from Nickel Titanium. The crack opening was monitored using COD gage (extensometer) and the crack length was verified periodically using a Scanning Electron Microscope (SEM).
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Very happy to work with MDT, excellent group of people easy to work. Test was a non-standard test so took thought and a lot of modification to reach a desirable outcome. MDT were an excellent partner in this regard. I appreciated their flexibility greatly.
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