Overall elastoplastic damage responses of spherical particle-reinforced composites containing imperfect interfaces

Abstract

As a predominant damage mode, the interfacial damage between the reinforcements and the matrix is of importance for the composite materials. Correspondingly, in this paper, the effects of imperfect interfaces are systematically investigated in the framework of higher order micromechanics and homogenization. To examine the effects of imperfect interfaces, the equivalent stiffness of reinforcing particles is considered based on the spring interface model. By taking advantage of the equivalent stiffness, the effective stiffness and the effective yield function of a composite are systematically derived to study the overall elastoplastic damage behaviors of particle-reinforced composites. In the absence of damage, comparisons between the theoretical predictions and the available experimental data are presented to illustrate the predictive capability of proposed micromechanical framework. Subsequently, a series of parametric studies are performed to examine the characteristics of the proposed micromechanicsbased damage formulation.

Constitutive modelling of ductile damage matrix reinforced by platelets-like particles with imperfect interfaces: Application to graphene polymer nanocomposite materials

“…Subsequently, when the interface imperfection is considered with α 0 = 2.10 −4 , a significant decrease of the E ef f /E 0 is noticed with respect to the case of perfect E ef f /E 0 shows a decrease with the volume fraction evolution. Again, the predictions remains in good agreement is obtained with results by Yanase and Ju [31].…”

“…Figure 4 presents the influence of the sliding coefficient α 0 on the normalised effective Young modulus E ef f /E 0 . Under the perfect interface condition, i.e α 0 = 0 and beyond a volume fraction f I = 0.2 the MT scheme underestimates results by Yanase and Ju [31].…”

“…Works by Ascione et al [30] to predict the actual stress state at the interface between concrete core and reinforcing plate should be cited. Herein, LSM is very attractive for its simplicity and flexibility to treat imperfect interface with limited number of model parameters [31].…”

Multiscale modelling of graphene platelets-based nanocomposite materials

“…Herein, advantage is taken of these derivations by considering GPL as continuum phases interacting with the polymer matrix through a slightly weakened interface. The LSM model is then considered for its simplicity and flexibility to treat imperfect interface with limited number of model parameters [10]. The solution of the heterogeneous material problem is obtained by the kinematic integral equation of Dederichs and Zeller [36].…”

“…Therefore, it represents an influential parameter that can significantly change the overall properties. Indeed, interface is subjected to defects (debonding, dislocations and cracks) between reinforcements and the matrix and can be identified as one of the predominant damage mechanics in particle and fibre-reinforced composites [10].Then, the accuracy of the composite response needs a proper accounting for the properties of the interface. Several micromechanics models have been developed for that purpose.Among them, one can distinguish the interphase models as well as interface models.…”