Experimental Strength Analysis of Variable Stiffness Waffel-Grid Cylindrical Compartments. Part 2. Analysis Results

• Main Authors: Degtyarev, Maksim A., Danchenko, Vitaliy G., Shapoval, Artem V., Avramov, Konstantin V.
• Format: Article
• Language: English; Russian
• Published: Інститут енергетичних машин і систем ім. А. М. Підгорного Національної академії наук України 2019
• Subjects: stress-strain state of tail compartment; equivalent compressive forces; displacement measurements; UDC 621.81; напружено-деформований стан хвостового відсіку; еквівалентні стискальні зусилля; вимірювання переміщень; УДК 621.81; хвостовой отсек; напряженно-деформируемое состояние хвостового отсека; эквивалентные сжимающие усилия; измерения перемещений
• Online Access: https://journals.uran.ua/jme/article/view/170927

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.