Testing device for fasteners

Details Testing device for fasteners Testing device for fasteners

1984-03-29

1985-12-24

Ciarlante, Anthony V.

Measuring and testing

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

Threaded fastener stress

G01N 300

Patent

active

045598304

ABSTRACT:
This invention is a device to test fastener heads and thread run-out areas for mechanical strength and detect defects. A fastener head is placed through a hole in a wedge-shaped washer and the shaft put under tension so that the fastener head completely contacts the wedge shaped washer. The stress produced is calculated to be within the elastic limit of the material and produces a stress in the shaft near the fastener head similar to that shown in FIG. 3. If the fastener is defective or is non-conformant to state-of-the-art standards, the fastener will fail when this test device is used. This method allows improved detection of hydrogen embrittened and improper heat treating processes which results in fasteners that will have unsatisfactory mechanical properties.

REFERENCES:
patent: 1011245 (1911-12-01), Rafter
patent: 4090399 (1978-05-01), Babcock
patent: 4231281 (1980-11-01), Reinwall
patent: 4498825 (1985-02-01), Pamer et al.

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