Experimental and Modeling Studies of Stress Wave Propagation and Energy Dissipation Mechanism in Layered Composite Structures

Abstract

Four composite structures (SiC/UHMWPE/TC4, SiC/TC4/UHMWPE, SiC/UHMWPE/MR/TC4, and SiC/TC4/MR/UHMWPE) were prepared using silicon carbide (SiC) ceramics, ultrahigh molecular weight polyethylene (UHMWPE), titanium alloy (TC4), and metal rubber (MR). The transmitted waves, failure forms, stress wave propagations, and energy dissipations of the composite structures were studied through Split Hopkinson Pressure Bar (SHPB) tests and numerical simulations. The results show that MR in composite structures can delay, attenuate, and smooth the stress wave, thereby reducing SiC damage. UHMWPE on the back of SiC provides cushioning for SiC, while TC4 on the back of SiC aggravates the damage of SiC. The composite structures with MR mainly dissipate the impact energy by reflecting energy, and the energy dissipation performance is better than that of composite structures without MR. A comprehensive comparison of transmitted waves, damage forms, stress wave propagations, and energy dissipations of the four composite structures shows that SiC/UHMWPE/MR/TC4 structure has the best impact resistance. Increasing the thickness of MR in the composite structures can improve the impact resistance, but there are also stress concentration and interface tensile stress.

Design and Performance of Layered Heterostructure Composite Material System for Protective Armors

“…The dynamic compression test was carried out on a Split Hopkinson pressure bar at room temperature and 10 3 /s and 6.5 × 10 3 /s strain rates simultaneously, and stress–strain curves are shown in Figure 4 . At a 1000/s strain rate (velocity of striker bar is 7.0 m/s), the deformation mode was elastic in both the layers, and due to an uneven stress distribution, the stress–strain curve shows wave-like behavior [ 29 , 30 ]. There is continual change in stress, but due to a high speed of impact, not enough time is available for the deformation and damage to occur.…”

“…The stress distribution pattern is different for the two plates and is obvious in Figure 13 . It may be used to analyze the impact compression behavior of a material [ 30 ]. When compressed slowly, the composite heterostructure obtains sufficient time to counter the effect of the applied load in the form of multiple deformation modes over large strain values and this is obvious from the prolonged elastic region followed by the plastic region, leading to the rupture of material.…”

Experimental Investigations on the Mechanical Performances of Auxetic Metal-Ceramic Hybrid Lattice under Quasi-Static Compression and Dynamic Ballistic Loading

“…Recently, researchers also studied other types of hybrid structures consisting of infilled ceramics and metal lattice frames, such as pyramid lattice [17,18], hexagonal honeycomb lattice [19], and derivative honeycombs [20]. Meanwhile, researchers also performed various types of experimental [21], numerical [22,23], fabrication process [24,25], and theoretical studies [26,27] on the design, and performance evaluation of metal-ceramic lattices for dynamic impact resistance applications.…”