This paper presents a study on mechanical response of porous aluminum skeleton/rigid polyurethane foam interpenetrating phase composites (IPCs) at different strain rates. Mechanical properties and failure mechanisms IPC were identified. Results shown that the rate sensitivity is mostly caused by foamed filler while deformation are still dominated skeleton. The skeleton exhibited lower total energy absorption high rates because decrease in dynamic compressibility. However, two constituent...

In this work, T2 red copper and high nitrogen austenitic stainless steel (HNASS) were explosively welded for the first time. The welding window was theoretically developed, experiment designed by considering effect of explosive loading on quality. To evaluate quality, microstructure mechanical properties composite material systematically investigated. results showed that quality in good agreement with predicted window. micromorphology interface changed a varied parameter, no intermetallic...

Energetic structural materials (ESMs) have many potential military applications due to their unique functions. In this work, the reactivity and penetration performance of ESMs been examined as a shaped charge liner material. The experiments nickel-aluminum (Ni-Al) copper-nickel-aluminum (Cu-Ni-Al)-shaped liners (SCLs) designed fired into 45# steel. targets were recovered analyzed by optical microscopy, electron energy dispersive spectroscopy, Vickers microhardness measurements. head tail...

Global climate change affects biodiversity patterns, especially in arid and semi-arid regions such as the Mongolian plateau, one of most ecologically fragile world. Three dynamic habitat indices (DHIs) were related to productivity hypothesis calculated based on FAPAR, including cumulative (DHIcum indicates availability resources food supply a year, representing available energy), minimum (DHImin limitations environmental stress), seasonal (DHIsea denotes stability). In this paper, we...

Abstract We report a shockwave method for altering the properties of superconductor material Bi 2 Sr CaCu O 8+δ (Bi2212). find that superconducting transition temperature ( T c ) increases from 84 K pristine sample to 94 treated at and pressure ~1200 ~31 GPa, respectively. X-ray diffraction transmission electron microscopy characterizations indicate this enhancement arises phase Bi2212 mixture semiconducting CuO 6+δ (Bi2201) during treatment. The shockwave-treated exhibits n-type...

In this paper, we present a piecewise cubic, parametric surface scheme to interpolate positions and normals on triangulated data set. For each triangle, fit three triangular cubic patches in Clough-Tocher like arrangement. However, while construct the micro-patches meet other C1, only require approximate G1 continuity across macro-patches boundaries. To control normal discontinuity macro-patch boundaries, neighbouring are constructed position at ends of their common boundary, as well have...

To determine the ballistic limit velocity of titanium–titanium tri-aluminide (Ti/Al 3 Ti)-laminated composites under action tungsten alloy spherical fragments, a type 12.7 mm gun loading system was used to test fragments vertically impacting Ti/Al Ti-laminated composite targets with different thickness. The relationship between and target area density obtained. As increased, energy absorbed by plate also enhanced. Based on dimensional analysis similarity theory, simulation law penetrating...

Microstructure and Mechanical ProPerties of stainless steel/aluMinuM Multilayer coMPosites by one-steP exPlosive WeldingThe steel/aluminum multilayer composites were prepared one-step explosive welding using ammonium nitrate with two different thicknesses.The microstructure mechanical properties the examined.There is a thin metallurgical melting zone at each bonding interface, consisting mostly iron aluminum elements.However, micro-crack appears in second obtained 24 mm thickness.The...

First of all, the explosion-welding method was adopted to prepare steel fiber-reinforced steel-aluminum composite plates. Secondly, smooth particle hydrodynamic (SPH) used investigate effect introducing fibers a vortex region created at bonding interface plate. Thirdly, following conclusions were drawn through an analysis with assistance scanning electron microscopy and energy-dispersive X-ray spectroscopy. A brittle intermetallic compound FeAl produced in environment characterized by high...

To investigate the strain rate sensitivity of mechanical properties and breaking mechanisms brittle hollow particles (BHPs) at mesoscopic level, low-velocity impact tests corresponding numerical simulation using finite element method (FEM) were performed on fly ash cenospheres (CPs). Characteristics response crushing behavior under dynamic loadings observed discussed based tests. Additionally, mechanism producing cenosphere was interpreted through simulations. The results are as follows. (1)...

The purpose is to optimize the optical fiber Fabry–Perot (F-P) sensor’s performances provide a realistic basis for fiber’s development. First, classification of F-P sensors summarized. sensors’ fundamental principles are analyzed, focusing on phase demodulation method that converts sensing system’s input light source into broadband source. source’s lightwave changes and Fourier transform fringe counting proposed method’s function analyze nonlinear dynamic characteristics. According method,...