Welded nickel alloy double-cantilever beam crack growth sensor a

Details Welded nickel alloy double-cantilever beam crack growth sensor a Welded nickel alloy double-cantilever beam crack growth sensor a

1993-04-05

1994-09-27

Raevis, Robert

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

G01N 1900

Patent

active

053498690

ABSTRACT:
A double-cantilever beam crack growth sensor made from welded alloy, e.g., nickel-based alloy, and a method for fabricating such sensors. The method includes the steps of forming a strongback from a block of a first nickel-based alloy; depositing a suitable thickness of nickel-based weld alloy on top of the strongback to form a bi-metallic test block; welding a second block of the first nickel-based alloy on top of the weld alloy; and machining the final three-layer block to form a double-cantilever beam crack growth sensor consisting of cantilever beams made of the first nickel-based alloy, a crack growth section of weld alloy having a microstructure wherein the direction of dendritic growth is parallel to the direction of crack growth and a third section made of the first nickel-based alloy.

REFERENCES:
patent: 4677855 (1987-07-01), Coffin, Jr. et al.
patent: 4924708 (1990-05-01), Solomon et al.

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