The formation mechanism of porous anodic TiO2 nanotubes (PATNT) still remains unclear. A special approach is proposed in this paper to investigate the forming process nanopores preformed nanotubes. novel and not easily brittle nanostructure, called triple-layered nanotube array, has been fabricated by changing electrolytes during electrochemical anodizing processes. first layer was fluoride-containing electrolyte, middle compact formed fluoride-free electrolyte second same electrolyte....

Three different kinds of PELE (the penetrator with lateral efficiency) were launched by ballistic artillery to impact the multi-layer spaced metal target plates. The velocities projectiles measured velocity measuring system. damage degree and process each layer plate impacted three analyzed. experimental results show that all have effect expanding holes on For normal structure PELE(without layered) tungsten alloy jacket radial layered jacket, diameters second plates are 3.36 times 3.76...

The formation mechanism of an EFP(explosively formed projectile) using a double curvature liner under the overpressure effect generated by regular oblique reflection was investigated in this paper. Based on detonation wave propagation theory, change incident angle collision at different positions and distribution area surface were calculated. Three-dimensional numerical simulations process EFP with tail as well ability to penetrate 45# steel performed LS-DYNA software, velocity, penetration...

Abstract The purpose of this study was to investigate the structural evolution and properties simultaneously biaxially stretched polyamide‐6/poly(ether block amide) copolymer (PA6/PEBA) films. results showed melting temperature PA6 increased from 220.02°C 225.56°C when stretching ratios 1 × 3.5 3.5, suggesting occurrence β → α crystal transformation. Meanwhile, increase crystallinity films due molecular orientation, which could create a more tortuous path for diffusion oxygen molecules...

In order to study the critical ricochet velocity and penetration of tungsten alloy rod obliquely penetrating a finite-thickness metal plate, experiment numerical calculation impacting on homogeneous armor steel plate with thickness 30mm at an angle 60° were carried out. Compared experimental results using models, it is found that, models proposed by Tate, Rosenberg Steven B for semi-infinite thick are quite different from those calculation, so they can not be applied situation plate. The...

Lead zirconate titanate powders (PZT) with different Zi/Ti values 52/48, 53/47, 54/46 and 55/45 were prepared by sol-gel technique. The sol was mixing stable solutions of Zr-nitrate, Pb-acetate Ti (OC4H9)4 precursors. decomposition precursors above 773 K, 923 K 1073 for value equls to 52/48; 53/47 54/46; leads the formation pure perovskite phase, respectively. X-ray diffraction analysis carried out confirm phase PZT. relationship synthesis temperature ratio is disscused it found that higher...

PELE (the Penetrator with Enhanced Lateral Effect) produces a large number of fragments after penetrating metal target plate, which can damage the high-value targets behind shield plate in area. However, when facing multi-layer spaced plates, it is difficult to penetrate them and due limited penetration ability fragments. Radial layered was designed for damaging plates. The experiment numerical simulation were carried out study deformation fragmentation penetrator 2A12 aluminum alloy or Q235...

Cylindrical TiO 2 nanotubes and hexagonal were obtained in the anodizing process of titanium fluoride-containing electrolyte. Based on experimental findings viscous flow model, a mechanism self-ordering cells arrangement for porous anodic (PATNT) is proposed this paper. The analysis results show that oxygen evolution pore bottoms plays an important role process. Oxide grows around bubbles bottoms, which formation cylindrical nanotubes. Volume expansion takes place during Plastic deformation...

This article presents a model to characterize the lateral expansion of metal cylinder expanded by polymer filler and analyzes influencing factors expansion. Based on elastoplastic theory thick-walled Drucker–Prager yield criterion, which considers material properties dimensions cylindrical shell is constructed. To verify accuracy model, series experiments, compared with are conducted under different conditions (different materials filler, thickness, shell), illustrates that proposed able...

The perforation tests of 45 # steel target plate and 2A12 aluminium alloy by PELE (the Penetrator with Lateral Efficiency) were carried out in this paper to study the failure characteristics metal plate. macroscopic morphology on plug was observed, wall cut polished observe distribution trend cracks scanning electron microscopy (SEM) metallographic microscopy. magnitude direction force produced during penetration calculated numerical simulation. experimental results show that, is different...

The impact experiment of penetrator with enhanced lateral efficiency (PELE) penetrating the metal target plate was carried out to study fragmentation characteristics PELE shell made tungsten alloy. fragments produced by were collected water tank and classified according their macromorphology. Scanning electron microscopy (SEM) used observe microstructures typical fracture surfaces fragments. experimental results show that macroscopic modes are mainly shear tensile failure. formed head small...

The aim of this study is to investigate strain rate effect indentation with different indenter control. In report, numerical simulations were performed by the finite element method. Material properties pure aluminum 5N (purity 99.999%) from impact and quasi-static experiments incorporated in simulation. Cowper-Symonds equation was used order consider effect. Conical half apex angle 70.3° used. Two control methods, constant loading both results compared. Strain diagrams also obtained for...