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Method and Apparatus to Propagate Crack Growth in a Workpiece

Abstract: 

A method and apparatus for forming a starter notch along the length of a work-piece for subsequent fatigue testing. The starter notch is formed with a cutting wire such that it will promote fatigue-cracking in the work-piece in one defined direction and avoids cracking in directions other than the length direction of the starter notch. Improved fatigue-testing analysis may therefore be realized. 

Full Text:
US Patent and Trademark Office

Patent Number: 
9,573,284
Date Of Issue: 
02/21/2017
Inventors: 

Clinton J. Thwing; Don E. Mahoney