Abstract
In this work the finite element method (FEM) was used to analyze the mechanical behavior of the composite materials subjected to the mechanical loading. This behavior is studied in terms of stress intensity factor variation as a function of the applied stress intensity. The residual stresses induced in the composites, during the elaboration of these composites are taken into consideration in this study. The superimposition of these types of stresses (residuals and commissioning) is simulated here by thermomechanical stresses. The results obtained show that in the vicinity very close to the fiber-matrix interface and under the effect of this loading type, the matrix cracks propagate in modes I, II and III, and far from the interface, in mode I. The propagation kinetics is slowed down by the interface-crack interaction. The effects of the crack size, the orientation and propagation of the crack, commissioning stresses, the elaboration temperature, fiber physical properties, matrix stiffness and thermomechanical stresses have been highlighted in this work.
Highlights
The composite materials are assembled materials, usually two immiscible components whose mechanical properties complement each to other
The propagation kinetics is all the stronger as the composite is elaborated at high temperatures
The results obtained in this study explicitly show that: - Under the residual stress effect, a matrix crack propagates at the heart of the matrix in pure mode I, in the vicinity very close of the fiber-matrix interface in mixed modes I, II and III, and in the fiber in mixed shear modes II and III
Summary
The composite materials are assembled materials, usually two immiscible components whose mechanical properties complement each to other. The result obtained, clearly defined that, under the effect of these stresses and in the vicinity very close of the fiber-matrix interface, the matrix crack propagates in mixed modes I, II, and III (Fig. 3).It is these non-zero values of stress intensity factors obtained in the simulation in three modes that are characteristic of such growth.
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