Papers by Author: Guang Fa Gao

Abstract: An advanced structure containing cavities was adopted in distribution layers. A series of large-scale similarity-simulation tests was conducted on the defense effect of the four structures under plane impact loads. Based on the tests results and theoretical analysis conclusions, numerical simulations were developed by LS-DYNA software. The results indicate that the numerical results agree well with the test data; the stress peak was distinctively decayed below the cavities, and the defense effect of circle-section cavity is more effective than square-section cavity while the defense effect was weakened when a thin steel plate was laid above the cavities. Compared with clipping performance of it under the explosion loads of mass ammunition, which of the structure with cavities under plane impact loads is better effective. This work provides an important basis for designing the scientifically safe distribution layers.

Abstract: Ferromagnetic base composite material is widely used in aerospace field, and its high pressure mechanical properties become the study hot spot in recently years. Aimed at an advanced ferromagnetic base composite material, its impact compression behaviors were investigated by means of Light Gas Gun (LGG). The shock wave velocity (D) and the particle velocity (u) behind the shock wave were measured and calculated by using Asymmetry Impact and Direct Measurement. Based on the experimental results and calculated results, a D-u type Hugoniot curve was obtained. The Grüneisen equation of state for the ferromagnetic base composite material and its coefficients were obtained on the basis of its Hugoniot curve.

Abstract: Ferromagnetic base composite materials were applied widely in aircraft and space vehicles engineering. Aimed to an advanced ferromagnetic base composite material, a series of experiments for thermal physical properties of this material were conducted, and the corresponding performance curves were obtained through statistic analyzing. The experimental results showed good consistency. And then the thermal physical parameters such as thermal expansion coefficient, engineering specific heat and sublimation heat were solved and calculated. This investigation provides an important foundation for the further research on the heat resistance and thermodynamic performance of this material.