Accession Number : ADA303165

Title :   Dynamic Responses of a Graphite/Epoxy Laminated Beam to Impact of Elastic Spheres.

Corporate Author : PURDUE UNIV LAFAYETTE IN COMPOSITE MATERIALS LAB

Personal Author(s) : Sun, C. T. ; Wang, T.

PDF Url : ADA303165

Report Date : SEP 1982

Pagination or Media Count : 60

Abstract : Wave propagation in ?90/45/90/-4S/90)sub 2s and (O/45/O/-45/O)sub 2s laminates of a graphite/epoxy composite due to impact of a steel ball was investigated experimentally and also by using a high order beam finite element. Dynamic Strain responses at several locations were obtained using strain gages. The finite element program which incorporated statically determined contact laws was employed to calculate the contact force history as well as the target beam dynamic deformation. The comparison of the finite element solutions with the experimental data indicated that the static contact laws for loading and unloading (developed under this grant) are adequate for the dynamic impact analysis. It was found that for the (O/45/O/-45/O)sub 2s laminate which has a much larger longitudinal bending rigidity, the use of beam finite elements is not suitable and plate finite element should be used instead. (MM)

Descriptors :   *LAMINATES, *IMPACT STRENGTH, *TERMINAL BALLISTICS, *GRAPHITE EPOXY COMPOSITES, IMPACT, AIRCRAFT ENGINES, PROJECTILES, FINITE ELEMENT ANALYSIS, BEAMS(STRUCTURAL), DEFORMATION, DISPLACEMENT, FIBER REINFORCED COMPOSITES, ELASTIC PROPERTIES, MODULUS OF ELASTICITY, STRAIN(MECHANICS), FAN BLADES, BENDING, STRAIN GAGES, EPOXY COMPOUNDS, RIGIDITY, POISSON RATIO, CLAMPS.

Subject Categories : Aircraft
      Laminates and Composite Materials
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE