Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) Photographs of hole drilling and water-jet cutting processes, and we have found that a pre-drilled hole with a diameter of 2 mm and then expanded to 10 mm using water-jet leaves no cracks and delamination around the hole in the specimen. (b) Open-hole specimen geometry and four-point bending experimental setup.
