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The change material mechanical properties based on elastic-viscous material model

The manuscript proposes to use the elastic-viscous material model to simulate the process of changing the mechanical state of the material during operation time. The proposed model established a link between the mechanical properties of the material and the structure's operation. Material mechanical parameters are represented by two parameters: elastic modulus and viscous drag coefficient. The structure's performance evaluation parameter is represented by two kinetic parameters during vibration, namely natural frequency and forced vibration amplitude. The novel aspect of this study is the inclusion of a viscous drag coefficient in the mechanical properties of materials to compensate for the shortcomings of previous evaluation models that are not consistent with reality. This research allows for a more in-depth examination of the material's mechanical properties as well as its ability to change over the course of the structure's life. The study improved some kinetic characteristics related to the material's operation by increasing the number of parameters of the viscosity coefficient in the mechanical properties of the material.