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- W2384420002 abstract ", Vol 13B (1994) pp. 1261-1266Michael D. Seale and Barry T. SmithDepartments of Physics and Applied ScienceThe College of William and Mary Williamsburg, VA 23187William H. ProsserMail Stop 231NASA Langley Research CenterHampton, VA 23681John E. MastersLockheed Engineering and Sciences 144 Research DriveHampton, VA 23666INTRODUCTIONComposite materials are being more widely used today by aerospace, automotive,sports equipment, and a number of other commercial industries because of their advantagesover conventional metals. Composites have a high strength-to-weight ratio and can beconstructed to meet specific design needs. Composite structures are already in use in secondary parts of the Douglas MD-11 andare planned to be used in the new MD-12X. Plans also exist for their use in primary andsecondary structures on the Boeing 777. DouglasO proposed MD-XX may also incorporatecomposite materials into primary structures such as the wings and tail. Use of composites inthese structures offers weight savings, corrosion resistance, and improved aerodynamics [1].Additionally, composites have been used to repair cracks in many B-1Bs where traditionalrepair techniques were not very effective. Plans have also been made to reinforce all of theremaining B-1s with composite materials [2].Verification of the structural integrity of composite components is needed to insuresafe operation of these aerospace vehicles. One aspect of the use of these composites is theirresponse to fatigue [3,4]. To track this progression of fatigue in aerospace structures, aconvenient method to nondestructively monitor this damage needs to be developed.Traditional NDE techniques used on metals are not easily adaptable to composites due to theinhomogeneous and anisotropic nature of these materials. Finding an effective means ofnondestructively monitoring fatigue damage is extremely important to the safety andreliability of such structures. Lamb waves offer one method of evaluating these composite materials [5,6]. As amaterial is fatigued, the modulus degrades. Since the Lamb wave velocity can be related tothe modulus of the material, an effective tool can be developed to monitor fatigue damage incomposites by measuring the velocity of these waves." @default.
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- W2384420002 title "LAMB WAVE RESPONSE OF FATIGUED COMPOSITE SAMPLES Reveiw of Progress in Quantitative Nondestructive Evaluation, Vol 13B (1994) pp. 1261-1266" @default.
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