Investigating the Effect of Abrupt Change in Geometry on Structural Failure of Artillery Projectile 155 mm
Tóm tắt
The survivability of artillery projectile 155-mm Extended Range Full Bore Boat Tail (ERFB BT) inside gun barrel during gun launch mainly depends upon the mechanical properties of the shell body, boat tail and driving band materials. Any abrupt change in geometry of any one of these components can impair the structural integrity of the projectile, thereby resulting in malfunctioning of the projectile. Investigating the effect of abrupt change in geometry of the components is of much significance for assessing structural integrity. To investigate the effect of abrupt change in geometry of the components on structural failure, the notch tensile tests are performed to quantify the data on notch strength ratio (NSR), stress triaxiality and true fracture strain of the materials. To identify the mode of failure, the fractographic examination of the fracture surfaces is made. NSR is found more than unity; stress triaxiality determined by applying Bridgman’s analysis reveals notch strengthening behavior of the materials. The fractographic examination shows that the shell body and boat tail materials fail in the combined ductile and brittle mode, whereas the driving band material fails by ductile mode. The outcome of the investigation confirms the load-carrying capacity and structural integrity of the projectile.
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Tài liệu tham khảo
D.S. Sounders, Mechanical properties and fracture toughness assessment of M795 and M549 155 mm artillery projectile bodies manufactured from HF-1 steel, Report No. MLR-R-1007, Department of Defence, Material Research Laboratories, (Australia) (1986)
Ballistics and Ammunition: Field Artillery, vol. 6, 1992
R.B. Ohol, B.A. Parate, D.G. Thakur, An investigation of plastic deformation of high explosive projectile 155mm during gun launch conditions using finite element method. Def. Sci. J. 72(6), 793–800 (2022)
R.B. Ohol, T.N. Parshuramkar, B.A. Parate, D.G. Thakur, An experimental study on dynamic mechanical properties of projectile 155mm ERFB BT material. Def. Sci. J. 73(3), 302–312 (2023)
P.W. Bridgman, Studies in Large Plastic Flow and Fracture. (McGraw-Hill, New York, 1952)
J.M. Choung, S.R. Cho, Study on true stress correction from tensile tests. J. Mech. Sci. Technol. 22, 1039–1051 (2008)
J. Aronofsky, Evaluation of stress distribution in the symmetrical neck of flat tensile bars. J. Appl. Mech. 18(1), 75–84 (1951)
Fracture mechanics study on 155 mm M107E1 projectile made from isothermally transformed HF-1 steel. Report No. FA-TR- 76015, U.S. Army Armament Command, Frankford Arsenal, (Pennsylvania) 1976
K.S. Zhang, Z.H. Li, Numerical analysis of the stress-strain curve and fracture initiation for ductile material. Engg. Fract. Mech. 49, 235–241 (1994)
M. Jonesa, M. M. Holea, C.M.Daviesa, A comparison of stress triaxiality and strain distributions in notched bar geometries as determined by bridgman expressions and finite element analysis. In: 1st Virtual European Confirence on Fracture, Procedia Structural Integrity, 2020, 28, pp. 2078-2085
Z.L. Zhang, M. Hauge, J. Osdegal, C. Thaulow, Determining material true stress-strain curve from tensile specimens with rectangular cross-section. Int. J. Sol. Struct. 36, 3497–3516
G.L. Rosa, G. Mirone, A. Risitano, G. Pine, Numerical verification of the Bridgman model for notched and unnotched round specimens, in Damage and Fracture Mechanics, ed. by C.A. Brebbia, A.P.S. Selvadurai (WIT Press, 2000)
E.J. Ripling, An investigation of the effects of stress concentration and triaxiality on the plastic flow of metals. Technical Report No. 26, Notch sensitivity of steels, (Metal Research Laboratory, Department of metallurgical engineering, Case institute of technology, Ohio, 1953)
ASM Mechanical Testing and Evaluation, vol. 8 (ASM International, 2000), p. 2221
ASM Metals Handbook, vol. 11 (ASM International, 2002), p. 1084–1093
J. Besson, Notched axi-symmetric test pieces, in Structural Components, Mechanical Tests and Behavioral Laws, ed. by D. Franqois (Wiley, 2008)
M. Alves, N. Jones, Influence of hydrostatic stress on failure of axisymmetric notched specimens. J. Mech. Phys. Solids 47(3), 643–667 (1999)
P.W. Bridgman, Studies in Large Plastic Flow and Fracture with Special Emphasis on the Effects of Hydrostatic Pressure (Mc Graw-Hill, New York, 1952)
V. Zichil, A. Coseru, F. Nedeff, C. Tomozei, Considerations on stress triaxiality variation for 2P armor steel. IOP Conf. Ser. Mater. Sci. Eng. 200, 012066 (2017)
G.E. Dieter, Mechanical Metallurgy, 3rd edn. (McGraw Hill Book Company Ltd., UK, 1988), pp. 285–286
Y. Bai, X. Teng, T. Wierzibiki, On the application of stress triaxiality formula for plane strain fracture testing. J. Eng. Mater. Technol. 131, 021002–21010 (2009)
M. Murata, Y. Yoshidab, T. Nishiwakic, Identification of ductile fracture parameter with stress correction method using notched round-bar tensile test. Proc. Eng. 207, 2060–2065 (2017)