Method For Characterizing Residual Stress In Metals

Patent · Mon Dec 02 23:00:00 EST 2002

OSTI ID:879727

Jacobson, Loren A ^[1]; Michel, David J ^[2]; Wyatt, Jeffrey R ^[3]

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1. Santa Fe, NM
2. Alexandria, VA
3. Burke, VA

A method is provided for measuring the residual stress in metals. The method includes the steps of drilling one or more holes in a metal workpiece to a preselected depth and mounting one or more acoustic sensors on the metal workpiece and connecting the sensors to an electronic detecting and recording device. A liquid metal capable of penetrating into the metal workpiece placed at the bottom of the hole or holes. A recording is made over a period of time (typically within about two hours) of the magnitude and number of noise events which occur as the liquid metal penetrates into the metal workpiece. The magnitude and number of noise events are then correlated to the internal stress in the region of the workpiece at the bottom of the hole.

• Research Organization: Los Alamos National Laboratory
• DOE Contract Number: W-7405-ENG-36
• Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC)
• Patent Number(s): US 6487915
• Application Number: 09/964549
• OSTI ID: 879727
• Country of Publication: United States
• Language: English