Abstract
An issue of a stress-strain state of a three-layer cylindrical shell under variable loads has been considered. Assessment results of a three-layer cylindrical shell stress-strain state with regard to the physical and mechanical characteristics of an aggregate polymer filler and its reinforcement intensity by means of the stiffening rings rigidly connected to the shell coating are presented in the article. Calculations have been performed using the software Nastran. Values of displacements and stresses have been calculated by applying the direct transient dynamic process algorithm. The time interval was 0.0000025 sec, and the total number of steps was 200. Choice of the three-dimensional finite element type was conditioned by the need of acquiring more detailed and accurate calculation results. The finite element model included 8000 three-dimensional solid finite elements and 9360 nodes. Impact of the physical and mechanical characteristics’ parameters of integral polymeric filler through the stiffening rings on the shell’s stress-strain state under the axisymmetric inner impulse load has been investigated. Numerous results concerning dynamics of the three-layer structure, which have been obtained by the finite elements method, allow distinguishing the stress-strain state of a three-layered cylinder-type elastic structure at any moment within an analyzed time interval. Optimization of the shell design is recommended. Intensity of the polymeric filler reinforcement impacts considerably the stress-strain state of the shell, as well as its performance characteristics. Increasing the intensity of the shell’s polymeric layer reinforcement decreases considerably the deformation of the shell’s bearing layers. Comparison of the obtained results to the impact of other factors indicates the credibility of the approach used and that the unbiased information was received.
Highlights
Investigation results for cases without the polymeric filler reinforcement [1] evidence the considerable impact on the stress-strain state of physical and mechanical characteristics of namely the filler and the internal and external coating variation
A «mechanical effect» caused by reinforcement of polymeric filler with discrete ribs can be an essential factor impacting the stress-strain state
The reinforcement efficiency for the structures of this type has been determined by means of the finite-element simulation of the three-layer cylindrical shell with the circumferential reinforcement ribs, stiffly binding internal and external shell layers (Fig. 1)
Summary
The investigations described below are aimed at amending the theoretical aspects of the problem with practical rationale, which would illustrate the character and importance of impact on the stress-strain state of engineering solutions, operational and natural factors, physical and mechanical properties of structural materials etc. Investigation results for cases without the polymeric filler reinforcement [1] evidence the considerable impact on the stress-strain state of physical and mechanical characteristics of namely the filler and the internal and external coating variation. A «mechanical effect» caused by reinforcement of polymeric filler with discrete (stiffening) ribs can be an essential factor impacting the stress-strain state Such approach to enhancing the layered structures’ rigidness is getting widespread and is especially applied in the three-layered shells, demonstrating a relative unsophistication of engineering and process solutions. The reinforcement efficiency for the structures of this type has been determined by means of the finite-element simulation of the three-layer cylindrical shell with the circumferential reinforcement ribs, stiffly binding internal and external shell layers (Fig. 1)
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