Nondestructive Testing of CFRP Plates by Lamb Waves.
نویسندگان
چکیده
منابع مشابه
Attenuation of Lamb Waves in CFRP Plates
The paper presents the Lamb wave attenuation of Carbon Fiber Reinforced Plastic (CFRP) plates on the basis of an experimental transmitter-sensor scheme. We measured separately the S0 and A0 Lamb modes of CFRP plates with three different kind of laminate lay-ups; unidirectional [0]8s (and [90]8s), cross-ply [0, 90]4s, and quasi-isotropic [0,45,-45,90]2s. Several ultrasound transmitters were used...
متن کاملLamb Waves and Nearly-Longitudinal Waves in Thick Plates
We discuss waves created in relatively thick plates by edge excitation at frequency-thickness (fd) products that correspond, in principle, to multiple Lamb wave modes. For relatively low values of the fd product it is clear that Lamb wave modes will be generated, while at large values of the fd product we observe a bulk (longitudinal wave) in the solid, but influenced by reflections from the pl...
متن کاملTransition from Lamb waves to longitudinal waves in plates
We use finite element simulations and experiments to examine the excitation of waves in a plate by normal forces applied to an edge. At low values of the frequency-plate thickness product, f·d, multiple Lamb wave modes are excited with different group velocities, but increasing f·d leads to the formation of a train of well-defined nearly-longitudinal pulses. We investigate the transition betwee...
متن کاملNondestructive Testing of Polycrystalline Silicon Substrates by Millimeter Waves
A technique for nondestructive detection of small cracks in polycrystalline silicon substrates used for solar cells was demonstrated. A millimeter wave signal of 110 GHz was used and the amplitude of the reflection coefficient was measured. To increase the testing speed, a slit aperture sensor was used. The crack was detected effectively, while the testing speed was 50×35 mm/s. The experimental...
متن کاملUse of Lamb Waves to Monitor Plates: Experiments and Simulations
Lamb waves at ultrasonic frequencies travel with little attenuation in thin elastic plates, and we demonstrate their use in pulse-echo behavior to monitor plate integrity. We envision using a single PZT wafer-type transducer to generate waves and to receive reflections from distant flaw or boundary locations. However, Lamb waves generally have multiple modes, each of them highly dispersive, and...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of the Society of Materials Science, Japan
سال: 1993
ISSN: 1880-7488,0514-5163
DOI: 10.2472/jsms.42.262