EXPERIMENTAL STRENGTH ANALYSIS OF VARIABLE STIFFNESS WAFFEL-GRID CYLINDRICAL COMPARTMENTS. PART 2. ANALYSIS RESULTS

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DOI https://doi.org/10.15407/pmach2019.02.031
Journal Journal of Mechanical Engineering
Publisher A. Podgorny Institute for Mechanical Engineering Problems
National Academy of Science of Ukraine
ISSN 0131-2928 (Print), 2411-0779 (Online)
Issue Vol. 22, no. 2, 2019 (June)
Pages 31-36
Cited by J. of Mech. Eng., 2019, vol. 22, no. 2, pp. 31-36

 

Authors

Maksim A. Degtyarev, Yuzhnoye State Design Office (3, Krivorozhskaya Str., Dnipro, 49008, Ukraine), e-mail: maxim.dv@gmail.com

Vitaliy G. Danchenko, Yuzhnoye State Design Office (3, Krivorozhskaya Str., Dnipro, 49008, Ukraine)

Artem V. Shapoval, Yuzhnoye State Design Office (3, Krivorozhskaya Str., Dnipro, 49008, Ukraine), e-mail: artemshapoval7@gmail.com

Konstantin V. Avramov, A. Podgorny Institute of Mechanical Engineering Problems of NASU (2/10, Pozharskyi Str., Kharkiv, 61046, Ukraine), e-mail: kvavramov@gmail.com, ORCID: 0000-0002-8740-693X

 

Abstract

This paper presents the results of the experimental analysis of the stress-strain state of the variable stiffness tail compartment (section) designed by the Yuzhnoye Design Bureau. Equivalent compressive forces in the cross-sections of the tail compartment without the trans-port-erector support are analyzed. It is established that the calculated and experimental compressive forces are extremely close. Deformations in the tail compartment were measured where resistance strain gages were installed. For the measurement of displacements, displacement gauges were installed. The displacements were measured at six points. They were studied at maximum loading values corresponding to the fifth and sixth stages of loading. Axial movements are always negative, which indicates that the shell is compressed in the axial direction. The stress-strain state of the launch vehicle tail compartment was experi-mentally investigated. The circumferential normal stresses are several orders of magnitude smaller than the longitudinal ones. Therefore, the circumferential stresses were not investigated. The results of the ex-perimental studies were compared with the numerical simulation data in the NASTRAN software package. The purpose of the simulation was to confirm the workability of the tail compartment under the loads that occur during operation. In other words, the design must withstand the actual loads without destruction and the appearance of plastic deforma-tions. Special attention was paid to the zones that were directly under the brackets. The experimental results and numerical simulation data are close.

 

Keywords: stress-strain state of tail compartment, equivalent compressive forces, displacement measurements.

 

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References

  1. Degtyarev, M. A., Danchenko, V. G., Shapoval, A. V., & Avramov, K. V. (2019). Experimental strength analysis of variable stiffness waffel-grid cylindrical compartments. Part 1. Experimental procedure. Journal of Mechanical Engineering, vol. 22, no. 1, pp. 33–36. https://doi.org/10.15407/pmach2019.01.033
  2. Kobayasi, A. (1990). Eksperimentalnaya mekhanika [Experimental mechanics]. Moscow: Mir, 550 p. (in Russian).
  3. Rabotnov, Yu. N. (1988). Mekhanika deformiruyemogo tverdogo tela [Mechanics of a deformable solid]. Moscow: Nauka, 710 p. (in Russian).

 

Received 12 July 2018