In order to solve the problem of large range negative velocity measurement in dynamic response measurement of structure, a photonic Doppler velocimetry (PDV) measurement system based on two laser sources is designed. Compared with the single laser source PDV system based on acoustic optical modulato...

To investigate the impact tensile response of silicone rubber subjected to different strain rates, quasi-static uniaxial tension tests at the strain rate of 0.001 s^–1, moderate strain-rate tensile tests at the strain rate of 15 s^–1 and high strain-rate tensile tests at the strain rates of 350 and 14...

Free vibration of pre/post-buckled graphene-reinforced nanocomposite beams was analyzed by the differential quadrature method. Considering the random distribution and directional arrangement of graphene nanoplatelets in the matrix, Young’s moduli of graphene nanocomposites in two modes were estimate...

The plate impact experiment was carried out through use of one-stage gas gun platform to study the spall of sintered Nd-Fe-B magnet subjected to one-dimensional loading. The free-surface velocity profile was measured using fiber velocity interferometer system for any reflector, and the spall strengt...

As one of the typical brittle materials, ceramics are highly sensitive to deformation. Under strong dynamic loads, it exhibits mechanical response characteristics completely different from ductile metal materials which involve damage and destructive behavior. In this study, the split Hopkinson bar t...

Piezoelectric ceramics are the core components of piezoelectric impact sensors. The mechanical and electrical behaviors of PZT-5 piezoelectric ceramics were studied by split Hopkinson pressure bar (SHPB) experimental technique. The tests were carried out at speeds of 4–14 m/s. In order to ensure the...

The penetration/perforation effects of high-speed ogive-nosed projectiles on reinforced concrete (RC) targets were experimentally investigated. The projectiles with a mass of approximately 10 kg were launched by a 100 mm power gun to striking velocities between 820 and 1195 m/s and impacted on the R...

A coupled FEM-SPH model for an ogival-nosed projectile penetrating into a steel plate was established. The influence of friction coefficient between projectile and plate on residual velocity estimation for projectile was analyzed. Based on the experimental data, a suitable friction coefficient was d...

Spallation is an important damage and failure mechanism produced by the interactions of decompression waves from the material interfaces, and is mesoscopically attributed to the nucleation, growth and coalescence of microdamages (microvoids and microcracks). Based on the works of Grady, Curran and J...

Results of Raman scattering measurements under pressure up to 25 GPa on adamantane (C₁₀H₁₆) carried out at room temperature are reported. The analysis of Raman data indicated four phase transitions. The ambient pressure disordered Fm3m structure ($\alpha$-C₁₀H₁₆) transformed to a high pressure order...

We performed in situ electrical conductivity measurements on pure and iron FeS-bearing olivine in a multi–anvil apparatus using the impedance spectroscopy technique under the condition of 1–3 GPa and 723–1273 K. The experimental results indicated that the electrical conductivities of 15% (mass fract...

To know the stress distribution mechanism of shock propagating across grain interface is of great significance to understand the interacting phenomena and plastic principles of shock and polycrystalline metal material. With molecular dynamics (MD), shock impacting on four kinds of metals with FCC (f...

Helium diffusion in carbonate minerals is important for studying the physical and chemical properties and dynamic processes of Earth’s degassing. This paper discussed helium incorporation and diffusion mechanism in crystals of calcite and aragonite based on density functional theory calculations. Th...

Based on first-principle calculations and the structure prediction method CALYPSO of particle swarm optimization algorithms, phase transition behaviors and physical properties of IrSb in the pressure range of 0–100 GPa have been systematically studied. At ambient pressure, the space group of $\alpha...

In order to solve the problem that the existing acceleration reconstruction methods rely on a large number of test data, this paper compares the performances of two different acceleration reconstruction methods, the damped sine and the wavelet. The evaluation of the quality in reconstructing shock r...

This paper describes an artificial interface compression technique for the multi-fluid piecewise parabolic method (PPM). The proposed approach enables the simulation of interfaces between compressible multi-fluid flows with high density ratios and strong shock waves. A compression source term incorp...

The smoothed particle hydrodynamics (SPH) method is used to simulate the deformation of penetration of granite at large strain and high strain rates. In order to describe the nonlinear deformation and failure characteristics of the projectile and target, the Holmquist-Johnson-Cook (HJC) constitutive...

Aluminum-polytetrafluoroethylene (Al/PTFE) specimens with different aluminum particle sizes of 10, 30 and 200 ${\text{μ}}{\rm{m}}$ and different molding pressures were prepared by compression molding and sintering. The impact-initiation test was carried out with split Hopkinson pressure bar (SHPB), ...

Quasi-static tensile/compression and SHPB (split Hopkinson pressure bar) compression tests were conducted in order to study the mechanical properties of steel fragments with different hardness. Furthermore, the fragments were launched by a ballistic gun at different velocities into a Q235A steel pla...

Shock wave propagation and bubble jet in the shallow water explosion near a rigid column are affected by many factors. Considering the influence of free water surface, water bottom boundary and rigid column, the coupling numerical model was established based on LS-DYNA, and the feasibility of numeri...

As the main energy absorbing component of bearing and collision in the automobile and aviation industry, the hat-section beam structure absorbs energy through plastic deformation of its own structure, which is the main criteria for previous safety design. Therefore, it is of great significance to st...

The deformation law and energy absorption performance of the multi-hierarchical sandwich structure under quasi-static compression have been studied by numerical and theoretical methods. The calculation formula of the critical failure load of the structure is established and compared with the numeric...