Characterization of Delaminations and Transverse Matrix Cracks in Composite Laminates Using Multiple-Angle Ultrasonic Inspection
- Author
- Johnston, Patrick H.
- Published
- July 15, 2012.
- Physical Description
- 1 electronic document
- Additional Creators
- Odarczenko, Michael T. and Appleget, Chelsea D.
Online Version
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- Restrictions on Access
- Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access - Summary
- Delaminations and transverse matrix cracks often appear concurrently in composite laminates. Normal-incidence ultrasound is excellent at detecting delaminations, but is not optimum for matrix cracks. Non-normal incidence, or polar backscattering, has been shown to optimally detect matrix cracks oriented perpendicular to the ultrasonic plane of incidence. In this work, a series of six composite laminates containing slots were loaded in tension to achieve various levels of delamination and ply cracking. Ultrasonic backscattering was measured over a range of incident polar and azimuthal angles, in order to characterize the relative degree of damage of the two types. Sweptpolar- angle measurements were taken with a curved phased array, as a step toward an array-based approach to simultaneous measurement of combined flaws.
- Other Subject(s)
- Collection
- NASA Technical Reports Server (NTRS) Collection.
- Note
- Document ID: 20120016954.
NF1676L-15216.
39th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE) Conference; 15-20 Jul. 2012; Denver, CO; United States. - Terms of Use and Reproduction
- Copyright, Distribution as joint owner in the copyright.
View MARC record | catkey: 15976600