Damage standard fabrication with attached sensor
First Claim
1. A method of fabricating a damage standard comprising:
- attaching an electromagnetic sensor to a critical surface of test material, the sensor being mounted between layers of the test material;
mechanically loading the test material and measuring a change in the electrical properties under the surface of the sensor; and
removing the mechanical load when the change in electrical properties indicates a prescribed level of damage.
2 Assignments
0 Petitions
Accused Products
Abstract
Reference standards or articles having prescribed levels of damage are fabricated by monitoring an electrical property of the article material, mechanically loading the article, and removing the load when a change in electrical properties indicates a prescribed level of damage. The electrical property is measured with an electromagnetic sensor, such as a flexible eddy current sensor, attached to a material surface, which may be between layers of the article material. The damage may be in the form of a fatigue crack or a change in the mechanical stress underneath the sensor. The shape of the article material may be adjusted to concentrate the stress so that the damage initiates under the sensor. Examples adjustments to the article shape include the use of dogbone geometries with thin center sections, reinforcement ribs on the edges of the article, and radius cut-outs in the vicinity of the thin section.
31 Citations
17 Claims
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1. A method of fabricating a damage standard comprising:
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attaching an electromagnetic sensor to a critical surface of test material, the sensor being mounted between layers of the test material; mechanically loading the test material and measuring a change in the electrical properties under the surface of the sensor; and removing the mechanical load when the change in electrical properties indicates a prescribed level of damage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of fabricating a damage standard comprising:
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attaching an electromagnetic sensor to a critical surface of test material; mechanically loading the test material and measuring a change in the electrical properties under the surface of the sensor; shaping the test material to create a stress distribution so that fatigue damage initiates under the sensor, the test material further comprising radius cutouts on both sides of a thinned section; and removing the mechanical load when the change in electrical properties indicates a prescribed level of damage. - View Dependent Claims (15, 16, 17)
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Specification