Low-Velocity Impact on Composite Sandwich Plates 9781423575788

Low-Velocity Impact on Composite Sandwich Plates

ISBN-10: 1423575784
ISBN-13: 9781423575788
AUTHOR:
PUBLISHER: Storming Media
Also available at Amazon.com
Note: Not guaranteed to come with supplemental materials (access codes, CDs, DVDs)
Product Description: The objective of the research is to analytically model the response of composite sandwich plates to low velocity impact. A displacement based, plane stress, finite element code is modified for this purpose. Major new algorithms include 5th order Hermitian interpolation, three dimensional equilibrium integration for transverse stress calculations, sandwich core modeling as an elastic plastic foundation, loading by simulated contact with a spherical indentor, adaptive mesh, damage prediction, damage progression via stiffness reduction, and local-global analysis for displacement. An experimental effort is also included in which composite sandwich plates with graphite epoxy facesheets and Nomex honeycomb core are subjected to low velocity impact (instrumented impactor) and static indentation. Comparison of static and dynamic results indicates limitations for the quasistatic assumptions typically made. Dynamic simulation of the impact event is provided by a one dimensional, three degree of freedom model. Classical three dimensional and cylindrical bending elasticity solutions attributed to Pagano are modified for Hertzian contact and sandwich structures, providing an exact solution against which the finite element analysis is benchmarked. The two dimensional (plane stress) finite element analysis, when combined with the three dimensional equations of stress equilibrium predicts the three dimensional state of stress in an undamaged composite sandwich under contact-type loading. The three dimensional stresses obtained from the equilibrium equations and the in-plane finite element stresses compare favorably with the elasticity solution. When compared to the experimental data, the finite element analysis shows the ability to model some of the important features of static indentation of composite sandwich structures.

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