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Research Papers

Influence of Rotating Band Construction on Gun Tube Loading—Part II: Measurement and Analysis

[+] Author and Article Information
Juha Toivola

 Mekalyysi Oy, Myllymäentie 5, FI-37960 SOTKIA, Finlandjuha.toivola@mekalyysi.fi

Seppo Moilanen

Janne Tervokoski

 Patria Land Systems Oy, P.O. Box 12, FI-38201 SASTAMALA, Finlandjanne.tervokoski@patria.fi

Heikki Keinänen

 VTT Technical Research Centre of Finland, P.O. Box 1000, FI-02044 VTT, Finlandheikki.keinanen@vtt.fi

J. Pressure Vessel Technol 134(4), 041007 (Jul 09, 2012) (8 pages) doi:10.1115/1.4006355 History: Received December 21, 2011; Revised February 17, 2012; Published July 09, 2012; Online July 09, 2012

The soft deformable metallic rotating band of large caliber projectiles prevents the gas leakage between the gun tube wall and the shell body by the band pressure on contact surfaces during the launch cycle of the gun. High rotating band pressures can lead to problems concerning gun tube wear, fatigue, and strength. The effects of changes in construction of rotating band and long range artillery projectile shell body on gun tube loading are studied experimentally. A practical analysis method for tube inner wall pressure computation from outer wall strain measurements is presented. The method is based on assuming stepped pressure load affecting on tube inner wall surface, when the projectile passes the measurement point. Although the analysis method was simplified, it was found to give useful and reliable results for comparative verification of different shell and band structures and their influences on gun tube loading. The structural design of the shell body and the rotating band were shown to be the most important aspects to cause the extreme loadings on the gun tube.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic views of rotating band cross sections and terminology of engraving shapes on band

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Figure 2

Strain gages and measurement sections on gun tube

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Figure 3

Model for gun tube pressure load from gas pressure p1 and rotating band pressure p2 and a schematic view of hoop ɛΘ and axial strain ɛx

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Figure 4

Measured hoop ɛΘ and axial ɛx strain on upper figure, breech pressure pb and respective comparison pressure pC on lower figure. Results at tube section D. Moderate velocity charge. Case ID17. N = 143rd round of tube. Sampling rate fs  = 40 kHz.

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Figure 5

Comparison pressures pC (thick curves) on tube sections (A, B, C) and breech pressure pb (thin curve) for four projectile types. Low velocity charge and N 540 fired rounds of tube. Sampling rate fs  = 20 kHz.

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Figure 6

Breech pressure pb (thin curve) and comparison pressure pC (thick curves) at tube measurement sections for low and high pressure/velocity round. Respectively 169th and 190th fired rounds of tube. Sampling rate fs  = 40 kHz.

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Figure 7

Comparison pressure peak value pCp versus fired rounds of tube at middle section A. Low velocity round. Tube No. R628 for fired round range N = (20–230) and Tube No. 98802 for N ≈ 550 rounds.

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Figure 8

Mean of comparison pressure peak values for gilding (ID1) and Cu (ID14) rotating band at tube cross sections (D, A, B, C). Low velocity charge. N 145 fired rounds of tube. Sampling rate fs  = 40 kHz.

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Figure 9

The wear of service gun tubes at sections C and E for 12 tubes of “not fired XX round” case and 12 tubes of “fired XX round” case

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