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Volume
12, Issue 5, 2003
On the Low
Velocity Impact Response of Laminated Composite Plates Using the p-Version Ritz
Method
Y.P.
Markopoulos and V. Kostopoulos
Applied
Mechanics Laboratory, Department of Mechanical and Aeronautical Engineering,
University of Patras,
GR-26504 Patras, Greece
e-mail: kostopoulos@mech.upatras.gr
(Received 5/03;
accepted 7/03)
ABSTRACT
Low energy impact
in composite laminates is often a crucial and destructive loading condition
since it leads to significant internal damage, undetectable by visual
inspection. Low velocity impact upon a laminated plate imposes a complex
stress state mainly due to the structural heterogeneity resulting by the ply
orientation of the constituent laminae and the contact boundary conditions,
which lead to a loading path that varies with the impact energy and the
properties of the impactor-impacted plate system. The present work deals with
the development of a numerical scheme for the calculation of the dynamic
response of any type of laminated composite plates under low-velocity impact.
The governing non-linear, second order differential equations are derived
using p-Ritz admissible polynomial functions and the elastoplastic version of
the Hertzian contact law. The dynamic response of fully clamped, cross ply and
angle ply composite plates are investigated.
Keywords: Low
Velocity Impact, Normalised response, Clamped boundary conditions
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