Characterization of strain-induced damage in composites based on the dissipated energy density part I. Basic scheme and formulation

Abstract An approach to characterizing failure behavior and degree of load induced internal damage in composite materials and structures is formulated in Part I of this work. It is based on a systematic experimental procedure to observe the response of composite materials subjected to multiaxial load environment. The energy dissipated by internal failure mechanisms is employed as a measure of internal damage and is characterized by an energy dissipation function, which is identified by means of a deconvolution procedure using data provided by NRL's automated in-plane loader testing machine. Part II of this work will display the dissipated energy density distributions in composite specimens that are used for the in-plane loader machine and naval structures, while Part III presents a general theory that includes the derivation for the constitutive behavior of the damaged composites.

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