Flaw growth correlator
First Claim
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1. A flaw growth correlator for monitoring flaw growth potential in a structural body, the correlator comprising:
- a flat metal gauge having a top, a bottom, sides, a first end portion, a second end portion, and a center portion, said gauge having a length (L), a width (W), and a thickness (T), the center portion including a necked down area across the width (W) of said gauge and having a thickness (X) less than (T); and
a crack initiating stress raiser disposed in the necked down area of the center portion of said gauge;
an aperture in the necked down area of the center portion of said gauge, said crack-initiating stress raiser extending outwardly from the side of said aperture.
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Abstract
A flaw growth correlator for monitoring flaw growth potential in a structural body. The correlator providing a major increase in the sensitivity of flaw growth when compared to current designs of constant thickness crack gauges.
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Citations
15 Claims
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1. A flaw growth correlator for monitoring flaw growth potential in a structural body, the correlator comprising:
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a flat metal gauge having a top, a bottom, sides, a first end portion, a second end portion, and a center portion, said gauge having a length (L), a width (W), and a thickness (T), the center portion including a necked down area across the width (W) of said gauge and having a thickness (X) less than (T); and a crack initiating stress raiser disposed in the necked down area of the center portion of said gauge;
an aperture in the necked down area of the center portion of said gauge, said crack-initiating stress raiser extending outwardly from the side of said aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A flaw growth correlator for monitoring flaw growth potential in a structural body, the correlator comprising:
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a flat angular shaped metal gauge having a top, a bottom, sides, a first end portion, a second end portion, and a center portion, said gauge having a length (L), a width (W), and a thickness (T), the thickness (T) in a range of 0.08 to 0.25 inches, the center portion of said gauge including a necked down area across the width (W) of said gauge and having a thickness (X) less than (T), the thickness (X) in a range of 0.01 to 0.08 inches; a crack-initiating stress raiser disposed in the necked down area of the center portion of said gauge and parallel to the width (W) of said gauge; means for measuring the length of the crack growth on the top of said gauge and parallel to said stress raiser; and securing means applied to the bottom of the first and second end portions for securing said gauge to the surface of the structural body.
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Specification