Please use this identifier to cite or link to this item: http://localhost:8081/xmlui/handle/123456789/10617
Title: PROPAGATION OF LAMB WAVES IN THIN ORTHOTROPIC PLATES
Authors: Balaji, Kurumeti
Keywords: MECHANICAL INDUSTRIAL ENGINEERING;LAMB WAVES;THIN ORTHOTROPIC PLATES;COMPOSITE MATERIAL
Issue Date: 1998
Abstract: Composite material have high specific strength and specific stiffness, but they suffer from material deterioration when subjected to adverse mechanical or environmental conditions. Hence, a periodic Non destructive inspection of composite material components is needed. Most commonly used Non-destructive Technique for composites is the ultrasonic testing method. Since the composite structures are normally in form of plates or shells, a systematic study of the propagation of Lamb waves in composite plates assumes considerable significance. At present ultrasonic testing using Lamb _waves is being carried out but the theoretical frame work for correlating and correctly interpreting the experimental results is lacking. The present work is the basic formulation for the Lamb wave propagation in a general direction in an orthotropic plate. The inaccuracy in the formulation by Dayal and Kinra [16] has been explained and a correct and mathematically rigorous formulation is presented. _ Typical dispersion curves of orthotropic plates have been obtained. Cut-off frequencies for orthotropic plates with wave propagating in a general direction have been obtained analytically. The variations in the dispersion curve with change .in material orthotropy parameter and the direction of wave propagation have been studied. The results of the 'present work may be used effectively to characterize all the material stiffness parameters by studying wave propagation in different direction. Thorough material characterization may further be used to quantify the overall damage in the Orthotropic plate
URI: http://hdl.handle.net/123456789/10617
Other Identifiers: M.Tech
Research Supervisor/ Guide: Mishra, B. K.
Singh, Narendra
metadata.dc.type: M.Tech Dessertation
Appears in Collections:MASTERS' THESES (MIED)

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