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Stress wave calculations in composite plates using the fast Fourier transform.The protection of composite turbine fan blades against impact forces has prompted the study of dynamic stresses in composites due to transient loads. The mathematical model treats the laminated plate as an equivalent anisotropic material. The use of Mindlin's approximate theory of crystal plates results in five two-dimensional stress waves. Three of the waves are flexural and two involve in-plane extensional strains. The initial value problem due to a transient distributed transverse force on the plate is solved using Laplace and Fourier transforms. A fast computer program for inverting the two-dimensional Fourier transform is used. Stress contours for various stresses and times after application of load are obtained for a graphite fiber-epoxy matrix composite plate. Results indicate that the points of maximum stress travel along the fiber directions.
Document ID
19730060430
Document Type
Reprint (Version printed in journal)
Authors
Moon, F. C. (Princeton University Princeton, N.J., United States)
Date Acquired
August 7, 2013
Publication Date
September 1, 1973
Subject Category
STRUCTURAL MECHANICS
Funding Number(s)
CONTRACT_GRANT: NAS3-14331
Distribution Limits
Public
Copyright
Other