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Internal instability as a possible failure mechanism for layered composites.

I A Guz1, M Menshykova2, C Soutis3

  • 1Centre for Micro- and Nanomechanics (CEMINACS), School of Engineering, University of Aberdeen, Aberdeen, UK i.guz@abdn.ac.uk.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|June 1, 2016
PubMed
Summary

This study presents a 3D analytical method for analyzing internal instability in layered composites. The approach offers a unified computational procedure for various material models and loading conditions, serving as a benchmark for simplified models.

Keywords:
analytical solutionscompressioninterfacial adhesionlayered compositesmicrostructure

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Area of Science:

  • Solid Mechanics
  • Materials Science
  • Composite Materials

Background:

  • Internal instability is a critical failure mode in layered composites.
  • Accurate prediction requires considering the 3D behavior of constituent materials.
  • Existing simplified models may lack sufficient accuracy for complex scenarios.

Purpose of the Study:

  • To revisit and refine a three-dimensional analytical approach for studying internal instability in layered composites.
  • To develop a unified computational procedure for the numerical realization of this 3D analytical method.
  • To provide a benchmark for simplified models used in composite structural integrity analysis.

Main Methods:

  • Utilized three-dimensional equations of solid mechanics to describe the behavior of composite layers and fibers.
  • Developed a unified computational procedure for numerical implementation.
  • Applied the method to various constitutive equations and loading schemes (uniaxial, biaxial).

Main Results:

  • Successfully demonstrated a unified computational procedure for the 3D analytical method.
  • Presented numerous examples of critical parameter calculations for specific composites.
  • Analyzed various buckling modes associated with internal instability.

Conclusions:

  • The presented 3D analytical approach provides a robust method for assessing internal instability in layered composites.
  • The unified computational procedure enhances the applicability to diverse material models and loading conditions.
  • The results serve as a valuable benchmark for validating and improving simplified composite modeling techniques.