Scaling of Energy Absorption in Composites to Enhance Survivability

Abstract

The objective of this paper is to study the size effect on the nominal strength of imperfect sandwich structures for buckling driven delamination, to quantify this size effect, and to determine its intensity. A secondary objective is to assess the size effect on the postpeak energy absorption, important for judging survival under blast or dynamic impact. Buckling driven delamination is difficult to control in experiments. Thus, the present study relies on numerical simulations using geometrically nonlinear finite element analysis as well as the softening foundation model, which is an adaptation of Winkler elastic foundation. Delamination fracture is modeled by a cohesive crack model. Dimensionless variables are used to cover the entire practical range.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 2006
Accession Number
ADA453365

Entities

People

  • Zdeněk Bažant

Organizations

  • Northwestern University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Composite Materials
  • Delamination
  • Epoxy Laminates
  • Failure Mode And Effect Analysis
  • Finite Element Analysis
  • Laminates
  • Materials
  • Materials Science
  • Materials Testing
  • Mechanics
  • Modulus Of Elasticity
  • Probability Distributions
  • Shear Modulus
  • Softening
  • Stiffness
  • Stress Strain Relations
  • Two Dimensional

Readers

  • Explosive Engineering.
  • Structural Health Monitoring of Composite Structures.
  • Theoretical Analysis.