An Analytical Method for Evaluating Impact Damage Energy of Laminated Composites

Abstract

A higher order beam finite element is developed for dynamic response of beams subjected to impact of elastic spheres. Hertzian law is used to evaluate the contact force. A step by step finite difference method is employed to integrate the time variable. The finite elements are first evaluated for homogeneous isotropic beams and excellent results are found. Impact of glass- epoxy laminates are then considered. The total energy imparted from the projectile to the laminate is computed and compared with experimental data. Good agreement is found. The present finite element procedure also allows one to separate the vibrational energy from the damage energy which is to be related to the residual strength of the composite after impact.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1975
Accession Number
ADA030781

Entities

People

  • Chintech Sun

Organizations

  • Purdue University

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Composite Materials
  • Dynamic Response
  • Epoxy Composites
  • Equations
  • Failure Mode And Effect Analysis
  • Fiber Reinforced Composites
  • Finite Element Analysis
  • Foreign Object Damage
  • Insensitive Explosives
  • Laminates
  • Materials
  • Materials Laboratories
  • Mechanics
  • Modulus Of Elasticity
  • Stiffness
  • Stresses

Fields of Study

  • Physics

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Molecular Photonics/Laser Physics
  • Reinforced Composite Materials