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.
Highlights
In recent years, porous metal materials such as aluminum foams have been widely used in impact-resistant structures due to good energy absorption properties
Rajaneesh et al [11] used LSDYNA software to study the mechanical behavior of aluminum foam composite structures under low-velocity impact. e results show that the energy absorbed by the composite structure depends on the type of panel and the thickness of the aluminum foam, and the peak load is only related to the type of panel
Finite Element Model. e finite element analysis was performed in LSDYNA software. e 8-node solid164 element was used to establish the model. e entire model only has a degree of freedom, namely, axial direction. e geometric parameters of the finite element model are consistent with the test conditions. e Split Hopkinson Pressure Bar (SHPB) system, silicon carbide (SiC), ultrahigh molecular weight polyethylene (UHMWPE), TC4, and metal rubber (MR) were, respectively, meshed into 5888, 2304, 2304, 2304, and 4608 elements
Summary
Porous metal materials such as aluminum foams have been widely used in impact-resistant structures due to good energy absorption properties. Liu et al [12] studied the shock wave attenuation performance and deformation mechanism of aluminum foam composite structures under explosive loading. It is found that the peak load of the foam composite structure is reduced by 61.54%∼ 64.69% compared with the structure without foam core, and the foam core layer dissipates energy mainly through the generation and propagation of cracks. To give full play to the impact resistance of the layered composite structure, it is necessary to apply the dynamic mechanics theory of materials to guide engineering practice. The current research studies on the dynamic mechanical properties of layered composite structures mostly focus on the evaluation of penetration and damage effects and rarely involve stress wave propagation characteristics
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