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1 Vol.21 No.5 The Chinese Journal of Nonferrous Metals May (2011) , 2, 2, 1 (1., ) : (OM) Largrange Johnson-Cook 7039 :7039 Johnson-Cook : TG146.2 A Microstructure character and numerical modeling of 7039 aluminum alloy target during impact penetration CAI Yi-ming 1, LI Hui-zhong 2, LIANG Xiao-peng 2, TANG Guo-jian 1 (1. School of Aerospace and Materials Engineering, National University of Defense Technology, Changsha , China; 2. School of Materials Science and Engineering, Central South University, Changsha , China) Abstract: 7039 aluminum alloy target was obliquely penetrated. The microstructure character around the crater was investigated by optical microscopy (OM). A numerical modeling during the impact penetration was established. The results show that, with the bullet penetrating into the 7039 aluminum alloy, the microstructure character around the crater is regular. When the adiabatic softening is insignificant, the adiabatic shear bands (ASB) and cracks around the crater are found. When the adiabatic softening is increased, the adiabatic shear bands coalesce into a wider overlapping shear deformation band, and the adjacent grains are deformed seriously, resulting in a lot of contorted bands. At the end of the penetration process, there are a lot of microbands. The process of bullet oblique impact penetration into the 7039 aluminum alloy can be simulated effectively using Johnson-Cook constitutive model described by Largrane. Key words: 7039 aluminum alloy; penetration; Johnson-Cook constitutive model; microstructure 7039 Al-Zn-Mg [1 3] MURR [4] 6061-T6 KUMAR [5] 7017 LI GOLDSMITH [6] (6061-T6) [7] 2519A ( ); (2009GK3038) ; : ; lhz606@mail.csu.edu.cn

2 FORRESTAL [8 9] BØRVIK [10 11] Johnsen-Cook T (%) 0.30 Si0.40 Fe4.50 Zn3.30 Mg 0.15 Cu0.25 Mn0.20 Zr0.10 Ti AlT6 (470 1 h)+( h) 20 mm 7.62 mm 53 WO 109C 100 m m/s 16 XJP 6A Kellor (1.0%HF+1.5%HCl+ 2.5%HNO 4 +95%H 2 O) ANSYS/LS- DYNA Lagrange Johnson-Cook T6 ( 1(a)) ( 1(b)) T (b) ABC D 4 1 Fig.1 Macroscopical photographs of craters of 7039 Al target: (a) Obverse; (b) Section 2(a) 2(b) 2(c)(d) 2(e) 2(f) [12 13] (DRX) [14] 2(a) [6] 2(b)(c) [15]

3 Fig.2 Optic photographs from different portables of crater wall region: (a) Section A; (b) Section B; (c), (d) Section C; (e), (f) Section D 2(e)(f) mm v 0 =802 m/sθ=45 1 4

4 Fig.3 Geometry for ogive-nose rod with 3.0 mm caliberradius-head (CRH) Table 1 Materials parameters for simulation of 4340 steel and 7039 Al alloy Parameter Description Nominal value 7039 Al 4340 steel Processor Description method Lagrange Lagrange Equation of state Mie-Gruneisen Mie-Gruneisen Mie-Gruneisen Strength model Johnson-Cook Johnson-Cook Johnson-Cook Failure model Bulk strain Bulk strain ρ 0 /(kg m 3 ) Reference density c 0 /(cm µs 1 ) Parameter c S 1 Parameter S S 2 Parameter Quad. S S 3 Parameter Cub. S Γ 0 Gruneisen coefficient σ/mpa Yield stress B/MPa Hardening constant n Hardening exponent C Strain rate constant m Thermal softening eponent D 1 Failure model constant 0.05 D 2 Failure model constant 3.44 D 3 Failure model constant 2.12 D 4 Failure model constant D 5 Failure model constant p min /MPa Hydro tensile limit p ε max Ultimate strain b Bulk strain Χ Taylor-Quinney coefficient G f /(GJ m 2 ) Crack softening E/GPa Elastic modulus T m /K Melting temperature T r /K Reference temperature c p /(J kg 1 K 1 ) Specific heat capacity at constant pressure

21 5 7039 979 2) Largrange Johnson-Cook 7039 REFERENCES [1] LEECH P W. Observations of adiabatic shear band formation in 7039 aluminum alloy[j].

5 Simulation results of 7039-T6 Al target at velocity of 802 m/s and obliquity of 45 : (a) Obverse; (b) Section 3 1) 7039 [2],,,. Al-Zn-Mg, [J]., 2005, 15(5): 727 733.

5 ) Largrange Johnson-Cook 7039 REFERENCES [1] LEECH P W. Observations of adiabatic shear band formation in 7039 aluminum alloy[j]. Metallurgical and Materials Transactions A, 1985, 16(10): Fig.4 Mesh distribution of target under oblique impact with obliquity of m/s T6Al Fig.5 Simulation results of 7039-T6 Al target at velocity of 802 m/s and obliquity of 45 : (a) Obverse; (b) Section 3 1) 7039 [2],,,. Al-Zn-Mg, [J]., 2005, 15(5): HUANG Lan-ping, CHEN Kang-hua, LI Song, LIU Hong-wei. Effect of high-temperature pre-precipitation on micro-structure, mechanical property and stress corrosion cracking of Al-Zn-Mg aluminum alloy[j]. The Chinese Journal of Nonferrous metals, 2005, 15(5): [3],,,,. 7A52 [J]., 2007, 30(4): HUANG Ji-wu, YIN Zhi-min, NIE Bo, CHEN Ji-qiang, HE Zhen-bo. Investigation of phases and thermal expansivity of 7A52 alloy in in-site heating[j]. Ordnance Material Science and Engineering, 2007, 30(4): [4] MURR L E, ALICIA A, NIOU C S. Microbands and shear-related microstructural phenomena associated with impact craters in 6061-T6 aluminum[j]. Materials Science and Engineering A, 1996, 216(1/2): [5] KUMAR K S, SINGH D, BHAT T B. Studies on aluminum armour plates impacted by deformable and non-deformable projectiles[j]. Materials Science Fourm, 2004, 465/466: [6] LI K, GOLDSMITH W. Impact on aluminum plates by tumbling projectiles experimental study[j]. International Journal of Impact Engineering, 1996, 18(1): [7],,,,. [J]., 2007, 30(3): ZHANG Xin-ming, GAO Hui, LI Hui-zhong, LIU Ying, JI Dong-sheng. Microstructure analysis of the penetrated aluminum plate with high copper content[j]. Ordnance Material Science and Engineering, 2007, 30(3): [8] FORRESTAL M J, PIEKUTOWSKI A J. Penetration experiments with 6061-T6511 aluminum targets and sphericalnose steel at striking velocities between 0.5 and 3.0 km/s[j]. International Journal of Impact Engineering, 2000, 24(1): [9] FORRESTAL M J, WARREN T L. Perforation equations for

6 conical and ogival nose rigid projectiles into aluminum target plates[j]. International Journal of Impact Engineering, 2009, 36(2): [10] BØRVIK T, CLAUSEN A H, HOPPERSTAD O S, LANGSETH M. Perforation of AA5083-H116 aluminum plates with conical-nose steel projectiles-experimental study[j]. International Journal of Impact Engineering, 2004, 30(4): [11] BØRVIK T, FORRESTAL M J, HOPPERSTAD O S, WARREN T L, LANGSETH M. Perforation of AA5083-H116 aluminum plates with conical-nose steel projectiles: Calculation [J]. International Journal of Impact Engineering, 2009, 36(3): [12],,,. [J]., 2000, 36(10): SHI Jie, DONG Han, WANG Qi, TIAN Liang. Characteristics of the adiabatic shear band in the armor sheet plate[j]. Acta Metallurgica Sinica, 2000, 36(10): [13] SEMIATIN S L, LAHOTI G D, OH S I. Material behavior under high stress and ultrahigh loading rates[c]//proceedings of Sagamore Army Materials Research Conference. New York: Plenum Press, 1983: [14]. [J]., 2001, 21(2): WANG Li-li. Progress in studies on dynamic response of structures and materials under explosive loading[j]. Explosion and Shock Waves, 2001, 21(2): [15] MURR L E, ESQUIVEL E V. Observations of common microstructural issues associated with dynamic deformation phenomena: Twins, microbands, grain size effects, shear bands, and dynamic recrystallization[j]. Journal of Materials Science, 2004, 39: ( )

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untitled 20 1 2010 10 Vol.20 Special 1 The Chinese Journal of Nonferrous Metals Oct. 2010 1004-0609(2010)S1-s0127-05 Ti-6Al-4V 1 2 2 (1. 710016 2., 710049) 500~1 000 20 Ti-6Al-4V(TC4) TC4 800 TC4 800 TC4 TC4 800