A5102921772- High-Velocity Impact and Material Behavior
- Energetic Materials and Combustion
- Structural Response to Dynamic Loads
- Electromagnetic Launch and Propulsion Technology
- High-Temperature Coating Behaviors
- Metal and Thin Film Mechanics
- Transportation Safety and Impact Analysis
- Optical measurement and interference techniques
- Laser-Plasma Interactions and Diagnostics
- Advanced materials and composites
- High-pressure geophysics and materials
- Advanced ceramic materials synthesis
- Advanced Surface Polishing Techniques
- Nuclear Materials and Properties
- Nuclear materials and radiation effects
- Innovative concrete reinforcement materials
- Microstructure and Mechanical Properties of Steels
- Rock Mechanics and Modeling
- Diamond and Carbon-based Materials Research
- Grouting, Rheology, and Soil Mechanics
- Ultrasonics and Acoustic Wave Propagation
- Hydrogen embrittlement and corrosion behaviors in metals
- Fatigue and fracture mechanics
- Numerical methods in engineering
- Geotechnical Engineering and Soil Mechanics
National University of Defense Technology
2007-2020
Beijing Institute of Aeronautical Materials
2008
University of Arizona
2002
Testing methods have been developed to determine the dynamic stress–strain responses and failure behavior of an epoxy, Epon 828/T-403, a poly(methyl methacrylate) (PMMA) under high-strain-rate uniaxial tension compression conditions. A split Hopkinson bar was modified for tensile low-strength low-mechanical-impedance specimens. An aluminum pressure used compressive responses. pulse-shaping technique employed in both experiments ensure that valid experimental conditions were satisfied....
Concrete filled tubular (CFT) columns are being more and utilized in construction of tall buildings bridges. Xiao recently developed a new CFT column system, named as confined concrete tubes (CCFT), validated its excellent load carrying capacity ductility, by static simulated seismic loading tests. This paper reports the impact behavior CCFT stub columns. The responses steel (CCFT) were investigated using high-speed gas gun. Experimental parameters included confinement details speed. Dynamic...
A 25 mm aluminum Kolsky bar is modified to test ultrasoft materials under intermediate strain rates (10-100 s(-1)). In this system, an ultralong loading pulse (5-50 ms) generated using 800 steel striker in combination with a shaper made of 2.5 thick soft rubber. For such long pulses, the traditional data reduction scheme based on gauge measurements not possible. We use laser gap measure deformation sample directly and monitor low amplitude dynamic stresses pair piezoelectric transducers that...
Polymer-bonded explosives (PBXs) are particulate composite materials composed of crystalline explosive grains bound in a relatively soft polymeric binder. It is important to optimize the fracture properties, while still maintaining low sensitiveness and high explosiveness PBX. This paper describes study on properties failure modes PBX by adopting newly proposed dynamic experimentation method — notched semi-circular bend (NSCB) specimen loaded with split Hopkinson pressure bar (SHPB) which...
A new effective model for calculation of the equivalent uniform blast load non-uniform such as close-in explosion a one-way square and rectangle reinforced concrete slab is proposed in this paper. The then validated using single degree freedom (SDOF) system with experiments tests slabs slabs. Test results showed that accurate predicting explosive charge weight stand-off distance to impose given damage level on tested RC especially load. It shown more than conventional SDOF analysis running...
We develop a novel setup based on the split Hopkinson pressure bar technique to test dynamic friction coefficient under impact loading. In setup, major improvement is that end of incident near specimen wedge-shaped, which results in combined compressive and shear loading applied specimen. fact, caused by interfacial between bars. Therefore, when two force histories are measured, can be calculated without any assumptions theoretical derivations. The geometry pairs simple, either cuboid or...
Microstructural evolution, interfacial toughness and damage initiation of Y 2 O 3 partially stabilised ZrO thermal barrier coatings (TBCs), which have been deposited by electro-beam physical vapour deposition on NiCoCrAlYHf coated superalloy substrate, were studied as a function cycles at 1150°C. Interfacial TBC systems was measured indentation method. The results show that bond coat (BC) is composed β-(Ni,Co)Al γ solid solution the initial cycles. β phase completely transformed into 185...
In this paper, two loosely coupled single degree of freedom (SDOF) systems are used to generate pressure-impulse diagrams (P-I) with the flexural and direct shear responses one-way reinforced concrete slabs subjected blast loading. The effect span length height ratio in P-I is investigated. numerical calculation results indicate that a slab tends fail mode if load amplitude high but short duration. It failure relatively low duration long. And might be combination damage dynamic loading...
Abstract Mixed‐mode dynamic fracture behaviour of cast aluminium alloy ZL205A thin plates with narrow U‐notch was studied by split Hopkinson tensile bar apparatus. Specimens different loading angles were designed to realize modes. The same condition maintained during the tests. Recovery specimens show that crack propagates along notch direction. Force–elongation relations angle increasing, force increases while final elongation decreases. Deformation and process observed a high‐speed camera....
Tensile properties of three steels named A, B, and C were investigated. The quasi-static experiments carried out by using WDW-100D computer control testing machine while the high strain-rate Split Hopkinson Bars (SHTB). stress-strain curves materials obtained, tensile strength, elongation, energy dissipated acquired. From experimental results, Jonson-Cook constitutive model was use to describe behaviours materials. results showed that steel B had highest strength lowest elongation than A B....