As a thermodynamic parameter, independent of temperature and composition, pressure provides a new dimension for material science research and innovation. Pressure has become an important source for developing new concepts, creating new theories and exploring new materials. Here, some advances in opt...

Phase behaviors of α-quartz and coesite at high pressures and room temperature have been investigated by using diamond anvil cells combined with synchrotron X-ray diffraction. α-quartz undergoes a phase transition to a new phase at about 23 GPa, and the phase transition gets finished at about 44 GPa...

As an important fluid medium in the upper mantle, carbonatite melt has stronger chemical and physical activity than silicate melt. The occurrence of a small amount of carbonatite melt in the upper mantle will significantly affect its many geophysical and geochemical properties, such as electrical co...

In our work, a series of Cu/PMMA composites with different components were prepared using the melting blending method, in which particles are randomly dispersed in PMMA matrix without agglomeration. Then again study was conducted on the Cu particles content’s influence on the sound velocity and impa...

Our work introduces a double-sided top ultra-high pressure die with a steel ring and a carbon fiber composite ring preloading together. Compared with the double-sided top die of the full steel ring, a layer of carbon fiber composite material ring instead of the outermost steel ring is used in this n...

Due to the machining challenge of high-quality cemented carbide, ultra-high pressure devices are always limited on scale. In our work, a new type of wire wound and split ultra-high pressure die with two-anvil was proposed to try to overcome this limitation. The die is mainly composed of internal spl...

To better understand crack generation laws and failure modes of various rocks compressed under different strain rates, specimens made from limestone and red sandstone were respectively prepared and their crack formation under different strain rates and stress modes was investigated in both quasi-sta...

In order to study the mechanical properties of granite under different unloading confining pressure rates, tests for the granite unloading confining pressure stress path under constant axial pressure were conducted via RMT-150B rock mechanics test system. The results show that: under the same initia...

The mechanical properties of G50 steel and G31 steel under quasi-static, dynamic and detonation loading conditions are compared by tensile test, impact test, Hopkinson bar test and detonation loading test. The results show that the mechanical performances of G50 steel and G31 steel under static and ...

In this study, axial compression experiments of 99 alumina ceramics at different strain rates were carried out. After soft recovering of the fragments at the corresponding strain rates, and geometrical characterization of the specimen fragments by the sieve residue method, the fragment size distribu...

In this work, a numerical simulation was performed on the dynamic response process of the prestressed reinforced concrete (PC) box-girder bridge under implosion load via three-stage continuous coupling finite element method. Taking gravity and prestress into account, the damage mode of PC box-girder...

Boundary condition exerts great influence on the failure mode of square plate under intensive loading. In this paper, a series of experiments of clamped square plates with different boundary chamfer radius were performed in the drop hammer impacting machine, in which the drop hammer was specially de...

To improve the energy output efficiency of composite warhead, a HEAT-HE composite warhead is presented, which can release explosively formed penetrator, prefabricated fragments and natural fragments. With the numerical simulation software LS-DYNA, we analyzed how the initial detonation mode (includi...

There is a possibility of gas leakage during the operation of gas distribution stations. The flammable gas mixture generated by the leaked gases may result in explosion accident and bring about great hazards to the public safety. Based on geographicinformationsystem (GIS) technology, the geometric m...

Explosion venting accidents in underground comprehensive pipe corridors occur from time to time, causing huge losses to ground personnel and property. Based on a pilot project of an underground comprehensive pipe gallery in Chongqing and the material point method, a high-energy combustion model is u...

The surface mounted devices (SMD) crystal oscillator is widely used in various electrical and communication equipment or systems. The crystal oscillator is prone to structural damage under shock environment, which may results in abnormal operation of the system. The relationship between the level of...

In order to improve melt-casting charge quality of the warhead with a large length-diameter ratio, a three-dimensional charge model was established by means of the finite element simulation method, and numerical simulation on the melt-casting charge process was carried out, including traditional cas...