Finite Element Methods for Nonlinear Static Analysis of Sandwich Plates.

Abstract

A finite element method, developed for static analysis of composite plates, was enhanced to be used with sandwich plates. The theory considers geometric nonlinearity and transverse shear. Furthermore, a new postprocessor was written to check for initial failure using the maximum stress criteria. It also includes a procedure for evaluating transverse normal stresses by enforcing equilibrium. The code modifications for sandwiches were verified by by comparing finite element solutions to closed-form sandwich theories. Both methods showed good correlation. In addition, comparisons between one type of composite plate and a similar sandwich plate found that the sandwich had better specific stiffness for various geometries. Finally, quasi-static models of low-velocity impacts on sandwich plates succeeded in predicting incipient damage due to core crushing in the impact region, but they were inconsistent in estimating the actual load levels for initial failure, based on experiments from other research.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1994
Accession Number
ADA289320

Entities

People

  • Damin J. Siler

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Composite Materials
  • Computer Programs
  • Coordinate Systems
  • Elastic Properties
  • Epoxy Composites
  • Equations
  • Failure Mode And Effect Analysis
  • Geometric Forms
  • Geometry
  • Honeycomb Cores
  • Impact Loads
  • Laminates
  • Mechanics
  • Pressure Distribution
  • Self Assembly
  • Three Dimensional
  • Two Dimensional

Readers

  • Computational Modeling and Simulation
  • Structural Dynamics.
  • Structural Health Monitoring of Composite Structures.