Search

In the design process of the blast-fragmentation warhead with preformed fragments, there are two key factors: the modeling and arrangement of the preformed fragments. These factors determine the accuracy of lethality assessment on the blast-fragmentation warhead with preformed fragments. Presently, there are some problems in the design process of the warhead, such as repeated modeling and low efficiency. This paper studies the modeling of blast fragmentation with preformed fragments. Based on the analysis of warhead structure and the technology of digital modeling, the idea of warhead modeling based on basic primitives and the arrangement method of preformed fragment modeling are proposed. In addition, by means of Visual C#, Direct X, and Direct3D, a digital modeling system based on the blast-fragmentation warhead with preformed fragments is developed, and then a warhead is taken as an example to realize the digital modeling. The case analysis shows that the digital modeling technology based on the blast-fragmentation warhead with preformed fragments completed the rapid and accurate modeling of the preformed fragment warhead, which lays the foundation for the accuracy of lethality assessment.

The noninvasive and nondestructive Fourier transform infrared (FTIR) imaging and dynamic mechanical analysis (DMA) are developed in this work to evaluate the microstructure-related properties of UHMWPE/Recycled-PA6 blends. FTIR imaging which is of in-situ and visualizing capabilities is shown to be extremely valuable in determining the phase structure of a multiphase system. It is found that small quantities of the HDPE-g-MAH compatibilizer could significantly improve the miscibility of the two immiscible polymers. It is further proved that in the UHMWPE/R-PA6 blends the R-PA6 phase distributes continuously, while the UHMWPE phase disperses in a discontinuous manner. Moreover, the blends with 44 wt% R-PA6 is found to exhibit an optimal miscibility behavior. This work demonstrates that FTIR imaging is a direct method in visualizing the miscibility of polymer blends. The combined FTIR imaging and DMA testing offers a new approach for qualitative and quantitative investigations on polymer blends with complex microstructures.

In order to improve the friction and wear performance of steel under severe service conditions such as high temperature, epoxy resin E-51 resin is used as the base material, graphite, MoS2 and other high temperature wear-resistant materials are used as pigments to prepare a kind of oil-coated high temperature resistant paint. The entropy weight method is used to comprehensively evaluate high temperature wear, thermal weight loss rate, and corrosion current density. The results show that the coating optimized by the entropy weight method has excellent performance. Among them, the high temperature wear rate of the paint film is 0.83%, the thermal weight loss rate at 200 °C is 4.56%, the thermal weight loss rate at 400 °C is 27.84%, and the corrosion current density is 9.31E-9. The alkali resistance of the paint film is far greater than the national standard.