Transient analysis of delaminated smart composite structures by incorporating the Fermi-Dirac distribution function

Heung Soo Kim, Anindya Ghoshal, Jaehwan Kim, Seung Bok Choi

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The transient response of delaminated smart composite laminates is studied using an improved layerwise laminate theory. The theory is capable of capturing interlaminar shear stresses that are critical to delamination. The Fermi-Dirac distribution function is combined with an improved layerwise laminate theory to model a smooth transition in the displacement and the strain fields of the delaminated interfaces during 'breathing' of delaminated layers. Stress free boundary conditions are enforced at all free surfaces. Continuity in displacement field and transverse shear stresses is enforced at each ply level. In modeling piezoelectric composite plates, a coupled piezoelectric-mechanical formulation is used in the development of the constitutive equations. Numerical analysis is conducted to investigate the effect of nonlinearity in the transient vibration of bimodular behavior caused by the contact impact of delaminated interfaces. Composite plates with surface-bonded or embedded sensors, subject to external loads, are also investigated to study the effects on transient responses due to various sizes and locations of delamination.

Original languageEnglish
Pages (from-to)221-231
Number of pages11
JournalSmart Materials and Structures
Volume15
Issue number2
DOIs
StatePublished - 1 Apr 2006

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