β Scribed by Roberto Brighenti
No coin nor oath required. For personal study only.
The behavior of fibre-reinforced composites is examined through the formulation of a micromechanical-based model. The elasto-plastic macro constitutive equations for such a class of materials, composed by a matrix phase with elasto-plastic behavior and a fibre-reinforcing phase, is firstly obtained considering an imperfect bond between the matrix and the fibres; a two-parameters model, obtained from energetic considerations and by considering the evolution of the shear stress distribution along a single fibre during the loading process, is formulated to determine the entity of the debonding. Moreover, the progressive damage which occurs in the case of repeated loading is considered to account for the degraded properties of the matrix and of the interface due to fatigue. The proposed model is implemented in a FE code and some numerical simulations are performed in order to assess its reliability.
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In the present research the fatigue damage evolution of a PEEK based composite was studied. Examined material consisted of a PEEK matrix reinforced by carbon micro-fibres with addition of fillers such as graphite and PTFE. Fatigue tests in load control were carried out up to 10 6 cycles at different
This paper discusses points related to the inclusion of MFRCs in French design rules and to numerical modelling (finite element method) of these fibrous composite materials. It is shown that as the use of these design rules for dimensioning of fibre reinforced concrete structures leads to an inopera