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论文题目： Effect of the Layer Sequence on the Ballistic Performance and Failure Mechanism of Ti6Al4V/CP-Ti Laminated Composite Armor

发表时间：Published: 2 September 2020

刊源：Materials 2020, 13(17), 3886 [ 点击下载PDF ]

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Figure 5 shows the strain distribution of the projec hye me do with het and lead jacket developed and plate during the penetration process. At t=35 μs, the steel core penetrated the target plate, and serious plastic deformation and failed quickly when interacting with the target plate. Severe plastic deformation with the effective strain of 2 occurred in the titanium alloy near the tip of the steel core in both schemes. For CPTi Ti64, the plastic deformation of the CP-Ti layer was also considerable At t=70 μs, the brass jacket and lead jacket penetrated the target plate, thus enlarging the crater on the front of the target plate of both T164/ CPTi and CPTi/Ti64, but almost half of the brass and lead had failed due to severe deformation. At t= 120 μs, the projectile had been stopped. The brass jacket and lead jacket were totally ripped off and most of them failed, causing a larger deformation on the target er, the tip of the steel core experienced small plastic deformations during penetration. Although Ti6A14V produces large plastic deformation in both schemes, the plastic deformation of CP-Ti in Ti64 CPTi is relatively small compared with CPTi/ T164.

Figure 5. The strain distribution of the projectile and plate during the penetration process: (a) Ti64/CPTi and (b) CPTi/Ti64.

Figure 6 shows the experimental and simulated macro morphologies of the cross-section along the penetration channel of the Ti6A14V/CP-Ti laminated plates. The damage to the rear face of the target plate is shown in the lower left inset. As is shown in Figure 6a, lamellar tearing occurred in the Ti6A14V that was indirectly connected to the penetration channel, and the rear face of the Ti64/CPTi plate underwent bulging without fracturing. Similarly, the numerical simulation results of the Ti64, CPTi plate（Figure 6b）revealed that bulging of the CP-Ti layer occurred without the deletion of elements The lamellar tearing generated in the CPTi/Ti64 plate was less extensive and narrower than that observed for the Ti64/CPTi plate（see Figure 6c）. However, severe cracks were generated on the back of the target plate. As revealed by the numerical simulation results of the CPTi Ti64 plate（Figure 6d）, element deletion occurred on the rear face of the target plate, that is, cracks were generated. Therefore the macro morphology shown by simulations closely corresponded to the experimental results.

Figure 6. Macro morphologies of the cross-section along the penetration channel of the Ti6Al4V/CP-Ti laminated composite armor: (a,c) Experimental results and (b,d) simulation results of the Ti64/CPTi plate and CPTi/Ti64 plate, respectively.

Figure 10 shows the contour of the first principal stress associated with Ti64/CPTi and CPTi/Ti64 composite target plates at 100 s during the penetration process. The vector of the first principal stress corresponding to several typical elements is indicated in the figure. The head of the arrow represents the direction of the stress, and the color and length represent the magnitude. A high stress concentration region, which was indirectly connected to the penetration channel and radially distributed in space, was generated in both schemes. Moreover, the stress vector showed that the first principal stress in the high stress concentration region was tensile in both schemes. The magnitude of this stress was, for some elements, >1000 MPa, i.e., higher than the tensile strength of Ti6Al4V, and therefore, cracks were preferentially initiated in these regions. In addition, the high stress concentration region of Ti64/CPTi took up more space than in the CPTi/Ti64 plate. Consequently, the lamellar tearing generated in the CPTi/Ti64 plate was less extensive and narrower than that in the Ti64/CPTi plate (as shown in Figure 6a,c). The high stress concentration region was generated on the back of the CPTi/Ti64 target plate, and the first principal stress in this region exceeded 1200 MPa. Therefore, crack formation was induced on the rear face of the target plate (as shown in Figure 6c).

Figure 10. Contour of the first principal stress and the first principal stress vector of several typical elements comprising the cross-section: (a) Ti64/CPTi and (b) CPTi/Ti64.