A Simple Method for Charpy Impact Testing Below 6 deg. K.
CALIFORNIA UNIV BERKELEY DEPT OF MATERIALS SCIENCE AND ENGINEERING
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The report describes a simple, inexpensive technique for conducting Charpy impact tests at temperatures as low as 5-6K. A Charpy V-notch specimen is wrapped in styrofoam and placed inside a thin-walled lucite box. Liquid helium is then transferred to the box system at 2-3 psi dewar pressure and a flow rate of approximately 2 litersminute using a vacuum insulated transfer line. A steady state temperature of 5-6K is quickly attained and maintained as long as helium transfer is continued. Tests comparing the proposed technique to the ASTM standard method at liquid nitrogen temperature indicate that a reasonably accurate impact energy is obtained. Author
- Test Facilities, Equipment and Methods
- Solid State Physics