Abstract
Using the model of quasi-static crack growth and test result of the double cantilever beam (DCB) sample of layred carbon/epoxy composite, the general regularities of the interlaminar crack resistance of mode 1 were studied. The main attention was focused on the variability of crack resistance associated, on the one hand, with the continuity of the fracture process, and, on the other hand, with the non-homogeneity of the material structure, which causes local random deviations from the average characteristics of the material.The dissipation energy rate (total crack resistance) and crack resistance function (R-curve) were extracted from test results and their properties analyzed.
Highlights
The quasi-static growth of a crack is the continuous process of an infinitely slow transition from one equilibrium state to another during which the parameters of any intermediate state satisfy to equation of energy balance
One of them is defined by the external load increase at the fixed size of a crack and other one by the crack size growth at the constant load. This introduction of the energy dissipation rate allows to describe the stable growth of a crack
The model of quasi-static process of crack propagation assumes that this process develops slowly and continuously, and in each position the system internal and external parameters satisfy to equation of energy balance
Summary
The quasi-static growth of a crack is the continuous process of an infinitely slow transition from one equilibrium state to another during which the parameters of any intermediate state satisfy to equation of energy balance. Using the Dugdale’s model of plastic zone and corresponding estimate of the energy dissipation rate, in [6] there was obtained a nonlinear differential equation for ‘load/crack length’ function. Solution of this equation describes of a crack continuos growth in the Griffith-type configuration of infinite quasibrittle plate. The quasi-static growth of a crack is interpreted as the continuous process of an infinitesimal transition from one equilibrium state to another during which the parameters of any state satisfied to equation of energy balance. In the presented paper the investigation is focused to non-homogeneity of the crack resistance using the developed model of quasy-static growth of a crack
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