Characterization and constitutive modeling of composite materials under static and dynamic loading

Isaac M Daniel*, Jeong Min Cho, Brian T. Werner, Joel S. Fenner

*Corresponding author for this work

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Composite materials were characterized under quasi-static and dynamic loading, and a constitutive model was proposed to describe the nonlinear multi-axial behavior of the materials at varying strain rates. The material investigated was a unidirectional carbon-fiber/epoxy composite. Multi-axial experiments were conducted at three strain rates, quasi-static (10 4s1), intermediate (1 s1), and high (180-400 s1), using offaxis specimens to produce stress states combining transverse normal and in-plane shear stresses to verify the model. A Hopkinson-bar apparatus and offaxis specimens loaded in this system were used for multi-axial characterization of the material at high strain rates. Stress-strain curves under tension and compression were obtained for various loading orientations with respect to the fiber direction. A nonlinear constitutive model is proposed following an elastic-plastic approach. It is based on a potential function in the form of a linear combination of deviatoric and dilatational deformation components. The model is able to describe the rate-dependent behavior under multi-axial states of stress including tensile and compressive loading. Experimental results were in good agreement with predictions of the proposed constitutive model.

Original languageEnglish (US)
Pages (from-to)1658-1664
Number of pages7
JournalAIAA journal
Volume49
Issue number8
DOIs
StatePublished - Aug 1 2011

ASJC Scopus subject areas

  • Aerospace Engineering

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