MODELING OF BENDING NON-ISOTHERMAL VISCOELASTICVISCOPLASTIC DYNAMIC DEFORMATION OF SHALLOW REINFORCED SHELLS. PART 2. ANALYSIS OF CALCULATION RESULTS

Calculations were performed and their results were analyzed for cases of isothermal and non-isothermal viscoelasticviscoplastic and viscoelastic-plastic bending deformation of cylindrical panels made of fiberglass, having a rectangular elongated shape in plan. Shallow shells with a traditional 2D reinforcement structure and with a spatial 4D structure are compared at the same fiber consumption. Fiberglass constructions are rigidly fixed along the entire edge and frontally loaded with excess short-term pressure of high intensity from the concave or convex front surface. It has been demonstrated that during the oscillation process, in the absence of external heat sources of non-mechanical origin, the temperature reaches peak values that are only 8–17 °C higher than the temperature of the natural state of the composite panel. The stabilized maximum temperature values (after the oscillations of the construction have died down) are only 3–10 °C higher than the temperature of the natural state. Shallow shells with the 4D reinforcement structure heat up somewhat more than structures with the 2D structure. It is shown that despite such insignificant heating, the calculation of the inelastic dynamics of such panels must be carried out, taking into account not only the sensitivity of the plastic properties of their components of the composition to the rate of strain, but also the temperature response. It has been demonstrated that under dynamic loading of a curved panel from the side of any of the front surfaces, in the process of oscillations, it clicks in the direction of concavity. As a result, after vibration damping, the elongated cylindrical fiberglass panel acquires a corrugated shape with folds oriented in the longitudinal direction. It is shown that in a relatively thin shallow shell, replacing the 2D reinforcement structure with a spatial 4D structure is ineffective.