Continuum Damage-Healing Mechanics With Application To Self-Healing Composites
The general behavior of self-healing materials is modeled including both irreversible and healing processes. A constitutive model, based on a continuum thermodynamic framework, is proposed to predict the general response of self-healing materials. The self-healing materials response produces a reduction in size of micro cracks and voids, opposite to damage. The constitutive model, developed in the mesoscale, is based on the proposed Continuum Damage-Healing Mechanics (CDHM) casted in a consistent thermodynamic framework that automatically satisfies the thermodynamic restrictions.
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An Engineering Penetration/Perforation Model of Hemispherical Nosed Rigid Cylindrical Rods into Strain-hardening Targets
A four-stage model of the penetration/perforation by hemispherical-nosed rigid cylindrical rods into targets whose materials exhibit strain-hardening effects. During each stage of the penetration process, a kinematically admissible velocity field involving one or more unknown parameters is assumed. These parameters are determined by minimizing the rate of plastic dissipation. From this velocity field, the incremental deformations of the target, the penetration depth, the resisting force acting on the penetrator and hence its deceleration are evaluated. We propose a criterion for the formation and ejection of the cylindrical plug in the target and use it to study problems involving the perforation of the target. Computed results for the exit speed of the penetrator and, when the targets are not perforated, of the penetration depth are found to match well with the corresponding test values.
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