A critical assessment is made herein on the accuracy of the Johnson-Cook (JC) constitutive model by comparing the model predictions with the test data for 2024-T351 aluminum alloy, 6061-T6 aluminum alloy, OFHC copper, 4340 steel, Ti-6Al-4V alloys and Q235 mild steel. These materials are selected bec...

The bridge is an essential part in the transportation system, and its damage effect under the strong impact load is always a hot issue in the world. Currently, the explosive explosion is one of the most effective bridge damage methods. Therefore, the research on the explosive shock wave propagation ...

Super hard materials have wide applications in industry, such as cutting tools, abrasive materials, wear resistant coatings. As one of the 5d transition metals double nitrogen compound, ReN₂ contains both covalent bond, ionic bond and metallic bonding. In view of its many excellent physical properti...

High pressure Raman scattering spectrometry which based on the diamond anvil cell technology plays an important role in the high pressure scientific research. The fluorescence of diamond anvil affects on the signal-to-noise ratio of Raman spectral for the sample in cell. The defect centers of 202 ge...

A series of high-quality Ib diamonds was successfully synthesized by {100} seed crystals with different shapes in NiMnCo-C system, using the temperature gradient method at pressure of 5.5 GPa and temperature of 1260–1300 ℃. The morphology of the crystal was characterized by optical microscopy and el...

Fe₃C (cementite) is a widely used material with excellent mechanical and magnetic properties; therefore the preparation method of Fe₃C has been widely concerned. In this paper, dense and high-purity bulk Fe₃C samples were prepared based on the solid-phase reaction of iron and carbon under high tempe...

During the manufacturing process of a filament wound pressure vessel, we embed the strain gauges between the metal tank and glass fiber reinforced epoxy composite layer to obtain the capability of in-situ monitoring . Experiments with a full-scale composite pressure vessel during hydraulic fatigue c...

Based on the discrete element algorithm (DEM), a numerical split Hopkinson pressure bar (SHPB) platform is established by the mean of particle flow code software (PFC^2D), and the feasibility of the system has been verified. The failure mode and the dynamic compressive strength of an inorganic glass ...

The meso-scale characteristics of granular metal materials play an important role in macroscopic mechanical behavior. The dynamic compression behavior of metal powders still needs further researches. In this paper, the copper powders persisting rich experimental results were selected as the research...

In order to achieve full fragmentation of the rock and effectively use the explosive energy, the impact of different hole spacing on the rock (hornfels) blast crack extension was studied via ANSYS/LS-DYNA software package using fluid-structure interaction (ALE) algorithm. The results showed that wit...

It is necessary to evaluate the fatigue life of coiled tube (CT) under the coupled load of internal pressure, bending load and torsion. First, the failure mechanism of low cycle fatigue of CT under coupling loading is analyzed. Based on Brown-Miller fatigue life model, a numerical calculation model ...

Shadowgraphs of shockwave expansion could be directly obtained by time-resolved shadowgraph imaging system when femtosecond ablating metal surface. The shock wave expansion on Cu and Fe surface obeys spherical propagation compared with that on Al target. Due to the influence of material ejection, th...

Low-velocity impact tests were performed for the [45₄/–45₄]_4T carbon fiber reinforced plastics (CFRP) laminates for exploring the low-velocity impact behaviors. The effects of impact angle of strip impactor and impactor diameter of hemispherical impactor on the impact responses of laminates are stud...

This paper discussed the strain rate effect of glass fiber/epoxy resin composite (GFRP)-reinforced Q235 circular steel tube under low-velocity impact load. Firstly, the responses (axial load and displacement) of GFRP-reinforced steel tube under quasi-static and low-velocity impact load were obtained...

A new damage assessment method of aircraft targets under blast wave was studied based on the strength of aircraft structures. The failure criterion of typical aircraft targets was determined according to the strength design criterion of aircraft structure. Further, the critical blast wave overpressu...

Numerical simulations are conducted for perforation of conical projectile impacting on thin steel target with various yaw angles to investigate the influence of yaw angle. The finite element models of conical projectile impacting on thin steel target with yaw angle varying from 2° to 10° are establi...

Without changing the mass characteristics and other cabin features of a prototype, the damage area of aviation bomb can be increased by more than 20% via designing a new structure of internal fragments assembly in the head lid and effectively loading this head lid by compartment cabin. These two mea...

In order to study the load of underwater explosion near the surface of the harbor basin and the damage effect on the wharf, we designed a typical wharf structure and built a harbor basin environment. Then through a series of numerical analysis which was accomplished based on finite element program L...

In order to investigate the ballistic performance of boron carbide ceramics, we carried out experiments of a ${\varnothing}$12.7 mm steel ball penetrating the boron carbide ceramic and composite target, and a 12.7 mm long-rod projectile penetrating the boron carbide ceramic composite target constrai...

Material constants played a significant role in the numerical prediction of warhead impacting metal targets, in order to obtain a set of valuable material constants fitting methods, JC strength model and JC failure model constants were acquired by different fitting method based on material mechanica...

To verify impact safety and implosion power of a composed charge, the drop hammer tests and implosion power experiments were conducted. The results show that critical height of the single thermo-baric explosive is 2.2 m under loading of 400 kg hammer, while the composed charge did not ignite under h...

In order to explore the influence of ambient temperature on the explosion properties of aluminium/ether/nitromethane gas-fluid-solid multiphase mixtures, we use a 20 L spherical explosion tank to experimentally obtain the effect of temperature on the mixture explosion over pressure, the maximum expl...

Gas explosion often occurs in the course of closing fired coal mine. The explosion limit and maximum explosion pressure under temperatures ranging from 25 ℃ to 200 ℃ and CO volume fractions of 1%−10% are studied by using a special 20 L explosive device. The results show that upper and lower explosio...

The project of loop pipeline in Pingtan test area is used as the engineering background. To compare the anti-explosion performance of " foam aluminum” and " steel plate-foamed aluminum-steel plate” anti-explosion structure under gas explosion, a 3D pipe gallery and soil structure is studied and anal...

To control the risk of disaster that may be caused by ice-coated power line, a novel de-icing method by applying linear shaped explosive blast has been proposed in the past decade. To investigate the mechanism and the key technology, blast tests on short ice-coated power line are performed as well a...

Transmission line is the important equipment to transport electrical energy through power grid. Mountain fires are frequent events in recent years, which severely damages the safe operation of the high voltage transmission lines. Therefore, it is very important to study the mechanical characteristic...