TL;DR: In this article, the nano-nitramine explosives (RDX, HMX, CL-20) are produced on a bi-directional grinding mill and the scanning electron microscope (SEM) observations show that the prepared particles are semi-spherical and the narrow size distributions are characterized using the laser particle size analyzer.

TL;DR: In this paper, the influence of welding consumables and welding processes on fatigue crack growth behavior of armour grade Q&T steel joints was investigated for fabrication of joints using ASS and LHF consumables.

TL;DR: In this paper, the influence of three factors, such as volume percentage of reinforcement particles (i.e., Al 2 O 3 ), tool tilt angle and concave angle of shoulder, on the mechanical properties of surface composites fabricated via friction stir processing was studied.

TL;DR: In this article, the authors used Eulerians numerical simulation methods to describe the fragmentation of EN24 steel cylinders filled with PBXN-109 explosive, using the physically based Armstrong-Zerilli constitutive model and the Goldthorpe path dependent fracture model.

TL;DR: There exists attraction force when UUV moves close to the sea bottom, and the attraction force increases with the decrease in distance, but the absolute value of the pitching moment coefficient rises with the decreases in distance and the increase in attack angle.

TL;DR: In this article, a bi-directional rotation mill was used to extract nano hexahydro-1,3,5-trinitro 1,3-5-triazine (RDX) samples under different conditions (liquid, temperature and drying).

TL;DR: In this article, the authors studied the EFP with three-point initiation and found that the decay velocity per meter with fins is much smaller than that of normal EFP, and the attitude angle steadily decreases.

TL;DR: In this paper, the applicability of the Johnson-Cook strength and fracture model is evaluated by comparing the fracture behavior of an expanding steel casing of a warhead with experiments, and the numerical codes and different numerical solution techniques, such as Eulerian, Lagrangian, Smooth particle hydrodynamics (SPH), and the corpuscular models recently implemented in IMPETUS Afea are compared.

TL;DR: In this article, an artificial neural network (ANN) constitutive model is developed for high strength armor steel tempered at 500°C, 600°C and 650°C based on high strain rate data generated from split Hopkinson pressure bar (SHPB) experiments.

TL;DR: In this article, three methods are experimentally investigated to increase peak simulated blast pressure produced by an oxy-acetylene driven shock tube while maintaining suitability for laboratory studies, including the addition of a Shchelkin spiral priming section which supports a deflagration to detonation transition.

TL;DR: In this article, two concepts to minimize the global effects caused by the detonation of an IED near a military vehicle induce subsequent severe acceleration effects on the vehicle occupants were developed, with the help of a combined method based on a scaled experimental technology and numerical simulations.

TL;DR: In this paper, a Si-based micro-detonator is designed and fabricated, which meets the requirement of MEMS safety and arming device, and the firing sensitivity of microdetonators is tested according to GJB/z377A-94 sensitivity test methods: Langlie.

TL;DR: In this article, an attempt is made to develop the tools that are capable enough to withstand the shear, impact and thermal forces that occur during friction stir welding of stainless steels.

TL;DR: In this paper, an improved version of 2.6-diamino-3,5-dinitropyrazine-1-oxide (ANPZO) with high yield and excellent purity has been prepared at pilot plant scale by an improved method.

TL;DR: In this paper, a combined theoretical analysis model for three response regions is built by analyzing the characteristics in these regions, and the penetration depth predicted by this combined model is in good agreement with experimental result.

TL;DR: An electromagnetic coupling mathematical model is established by finite element method and is verified by contrastive experiments of copper matrix Ni-TiN cylindrical coating electrode, copper electrode and Cu50W electrode as mentioned in this paper.

TL;DR: In this paper, a combined proportional navigation (CPN) guidance law is proposed to intercept high-speed targets, which is a common case for ballistic targets, and the range of target-to-interceptor speed ratio during target interception is derived when guidance laws are applied in high speed targets interception and the effectiveness of negative navigation ratio in the PN-based guidance law was proven analytically in some lemmas.

TL;DR: The potential for further increase in accuracy of these aiming angles preparation methods is pointed out and two different methodologies practically used in the praxis are analysed and compared.

TL;DR: In this article, both heating and solvent-spray methods are used to consolidate the standard grains of double-base oblate sphere propellants plasticized with triethyleneglycol dinitrate (TEGDN) to high density propellants.

TL;DR: In this paper, the authors analyzed the dynamic response of a guided projectile during the engraving process and found that a material with a small modulus of elasticity is more stable than one with a high one.

TL;DR: In this paper, a constitutive model based on physical-based hardening model and phenomenological softening model is established for the flow behavior and dynamic globularization of TC11 titanium alloy during subtransus deformation.

TL;DR: In this article, the resistive force which a target exerts on a rigid projectile during the penetration of a rigid object is theoretically analyzed, and the threshold Vc of impact velocity applicable for the assumption of constant resistive forces is formulated through impulse analysis.

TL;DR: In this article, a new guidance law, called biased retro proportional navigation (BRPN), is proposed to intercept high-speed targets with angular constraint, which can be used for ballistic target interception.

TL;DR: In this paper, the benefits of base bleed in base flow field with hot base bleed for two jet models are studied by using a finite volume scheme, and the results show that the base pressure of the annular jet model is higher than that of the circular jet model with the changes of the injection parameter and the injection temperature.

TL;DR: In this article, a closed bomb test was conducted to investigate the influence of both porous structure style and RDX content on burning behavior, and the results showed that the vivacity increases with RDX contents and varies with inner structure.

TL;DR: In this paper, a series of di-1H-1,3,4-triazole derivatives with different substituents and linkages were evaluated using the Kamlet-Jacobs approach based on the calculated density and HOF.

TL;DR: The result shows that the model has higher modeling precision, good generalization capability and a certain anti-interference ability, and the simulation results show that restoring force–displacement curve hysteresis loop is very close to the real curve.