Estimation of the durability of polymer composites on a fabric basis, taking into account the influence of non-force factors

Abstract

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.

Improving the quality of installation of preinsulated pipelines of heat supply systems

“…Failure to comply with the installation technology, namely the sealing and insulation of joints when installing pipes with polyurethane foam PE insulation, leads to a violation of insulation in the most vulnerable places of any pipelines -the joints of the pipe and the shaped element. The result of this will be the occurrence of premature external corrosion of the pipe [24], a decrease in durability [25], followed by the failure of the pipeline or carrying out constant expensive repair work [26,27].…”

Calculation of the durability of sealing and awning materials

“…The second way is to replace the random loading process with a schematized process, which, in terms of the level of introduced fatigue damage, should be equivalent to the real one. In this case, it is possible to reduce the test time due to the use of an appropriate equivalent mode [9][10].…”