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Damage to the plain concrete targets: NWS charge (test #1) – front face (a), rear face (b); and SWS charge (test #3) – front face (c), rear face (d)
Source publication
The present work summarizes the results of Shaped Charge jet impact against plain and ultra high performance concretes. Three charge configurations were investigated using different wave shaping methods for focussing the detonation wave. The wave shaping enhancements resulted in a significant improvement of the jet penetration performance. The thre...
Contexts in source publication
Context 1
... example of damage to the PC targets is shown in Fig. 3. From the damage summary, it follows that all of the jets from the charges with wave shaping (simple or complex) penetrated the 300 mm deep plain concrete targets, whereas the NWS charge jet did not fully penetrate, as shown in Fig. 3(a-b). Complete penetration depends on both the borehole produced by the jet and the level of ...
Context 2
... example of damage to the PC targets is shown in Fig. 3. From the damage summary, it follows that all of the jets from the charges with wave shaping (simple or complex) penetrated the 300 mm deep plain concrete targets, whereas the NWS charge jet did not fully penetrate, as shown in Fig. 3(a-b). Complete penetration depends on both the borehole produced by the jet and the level of spallation on the rear face of the target. The CWS charge had the highest jet velocities (as recorded by the make screen gauges), however, the SWS charges produced the largest rear face spallation depths against the plain concrete targets. This may ...
Context 3
... damage images in Fig. 3 correspond to the NWS charge where the jet did not fully penetrate the target, and the SWS charge at 134 mm standoff distance (test #3). The latter result is typical for the rest of the set of tests against the plain concrete. The damage results reported here for the UHPC targets relate to the five tests #6-#10 as described in the ...
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Citations
To avoid the aimless design of shaped charge liner (SCL) material for obtaining deep penetration and large penetration holes in reinforced concrete targets, new design principles are proposed in this study. Following the principles, an intermetallic-compound-reinforced Ti-17Al-29Nb alloy was prepared via hot isostatic pressing (HIP) sintering. This alloy shows high dynamic compressive strength (1583 MPa), high dynamic compressive plasticity (35%), high elevated-temperature tensile strength (414 MPa at 800 ℃), and low elevated-temperature plasticity (6% at 800 ℃). The penetrating experiments showed that the Ti-17Al-29Nb alloy liner penetrated through the 600-mm-thick C40 concrete target, forming large penetration holes. Although the penetration depth was slightly lower than that of the most commonly used pure copper liner, the diameter of the exit hole was 2.1 times that of the pure copper liner. The high jet tip velocity (7651 m/s) and large jet diameter (a maximum of 0.28 CD) were the key factors to form the high penetration depth and large penetration hole. This study not only brings a new type of SCL material with excellent penetration performance against reinforced concrete targets but also provides a new research direction for the design and selection of the SCL materials.
Experiments on shaped charge penetration into high and ultrahigh strength steel-fiber reactive powder concrete (RPC) targets were performed in this paper. Results show that the variation of penetration depth and crater diameter with concrete strength is different from that of shaped charge penetration into normal strength concrete (NSC). The crater diameter of RPC is smaller than that of NSC penetrated by the shaped charge. The jet particles are strongly disturbed and hardly reach the crater bottom because they pass through the narrow channel formed by jet penetration into the RPC. The effects of radial drift velocity and gap effects of jet particles for a shaped charge penetration into RPC target are discussed. Moreover, a theoretical model is presented to describe the penetration of shaped charge into RPC target. As the concrete strength increases, the penetration resistance increases and the entrance crater diameter decreases. Given the drift velocity and narrow crater channel, the low-velocity jet particles can hardly reach the crater bottom to increase the penetration depth. Moreover, the narrow channel has a stronger interference to the jet particles with increasing concrete strength; hence, the gap effects must be considered. The drift velocity and gap effects, which are the same as penetration resistance, also have significant effects during the process of shaped charge penetration into ultrahigh-strength concrete. The crater profiles are calculated through a theoretical model, and the results are in good agreement with the experiments.
