We considered the problem of evaluating the durability of film-fabric material (FFCM). The models of phase deformation of a film-fabric composite material was developed which took into account nonlinear viscoelasticity, temperature changes, material aging, microdamage accumulation processes and photodestruction. We presented the composration as an inhomogeneous body. When choosing the structure of the defining relations, we used the experimental data obtained by the authors for the phases of FFCM. Based oite under considen the modification of the second Fick’s law, the kinetic law of propagation of the photodestruction parameter deep into the representative cell of FFCM was constructed. To conduct a qualitative analysis of the behavior of the composite material under study, we formulated the problem with some model constitutive relations and numerical experiments were performed.
The combination of operational factors increases significantly ageing and failure rate of polymer composite materials under stress-strain conditions. The objective of this study is to develop the method for simulating the behavior of polymer composite reinforcements in cement concrete under stress-strain conditions. The procedure was developed and the setup was upgraded to conduct accelerated testing of polymer composite reinforcements for cement concrete. The significance of the findings for the construction industry lies in the development of methodology for predicting the durability of polymer composite materials under specified operating conditions.
Polypropylene expansion tanks have been subjected to accelerated weathering testing according to the developed procedure of accelerated weathering testing. The objective of the study was to determine an arbitrary lifetime of tanks under operating conditions at higher temperatures, humidity, and UV radiation (climate regions of India and Venezuela). As a result of the studies of the polypropylene expansion tanks the following has been established: the failure of the both tank types (A and B) occurred in the area of the weld in the upper and lower part after four arbitrary years of accelerated weathering testing; the stress-strain behaviour in the outer tank walls is influenced by the interior structure of the partitions. The tanks with a larger opening in the partitions feature significant deformations when the inner pressure increases as a result of a higher temperature; the “sensitive indicators” of ageing and failure of the tank material have been found: elongation at break, flexural modulus, and impact strength.
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