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electronic journal Machines and Plants: Design and  Exploiting

Bauman Moscow State Technical University. El № FS 77-61859. ISSN 2412-592X

Multilayer Finite-Element Model Application to Define the Bearing Structure Element Stress State of Launch Complexes

Machines and Plants: Design and Exploiting # 06, December 2016
DOI: 10.7463/aplts.0616.0852117
Article file: Aplts_Dec2016_027to037.pdf (1065.36Kb)
authors: V.A. Zverev1,*, V.V. Lomakin1



1 Bauman Moscow State Technical University, Moscow, Russia

The article objective is to justify the rationale for selecting the multilayer finite element model parameters of the bearing structure of a general-purpose launch complex unit.
A typical design element of the launch complex unit, i.e. a mount of the hydraulic or pneumatic cylinder, block, etc. is under consideration. The mount represents a set of the cantilevered axis and external structural cage. The most loaded element of the cage is disk to which a moment is transferred from the cantilevered axis due to actuator effort acting on it.
To calculate the stress-strain state of disk was used a finite element method. Five models of disk mount were created. The only difference in models was the number of layers of the finite elements through the thickness of disk. There were models, which had one, three, five, eight, and fourteen layers of finite elements through the thickness of disk. For each model, we calculated the equivalent stresses arising from the action of the test load. Disk models were formed and calculated using the MSC Nastran complex software.
The article presents results in the table to show data of equivalent stresses in each of the multi-layered models and graphically to illustrate the changing equivalent stresses through the thickness of disk.
Based on these results we have given advice on selecting the proper number of layers in the model allowing a desirable accuracy of results with the lowest run time. In addition, it is concluded that there is a need to use the multi-layer models in assessing the performance of structural elements in case the stress exceeds the allowable one in their surface layers.

References
  1. Timoshenko S.P., Woinowsky-Krieger S. Theory of plates and shells.2nd ed. N.Y.: McGraw-Hill, 1959. 580 p. (Russ. ed.: Timoshenko S.P., Woinowsky-Krieger S. Plastinki i obolochki. Moscow: URSS, 2009. 635 p.
  2. Bathe K., Wilson E. Numerical methods in finite element analysis.Englewood Cliffs: Prentice-Hall Inc., 1976. 528 p. (Russ. ed.: Bathe K., Wilson E. Chislennye metody analiza i metod konechnykh elementov.Moscow: Ozon, 2012. 445 p.).
  3. MSC Nastran. Available at: http://www.mscsoftware.ru/products/msc-nastran, accessed 29.09.2016.
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