Huan Shi

Numerical Simulation and Dimensional Analysis for Impact Resistant of the Building Structures

Theoretical analysis and numerical calculation of the building structures with impact resistant character depend on the parameters and results of the experiment. The dimensions of the plototype is shrunken to the experimental model. The minification of the dimension and strength is not accordant between the plototype and the experimental model. Usually,the relative strength of the experimental model is greater than the plototype. Thus, the research on convergent-divergent ratio is needed when designing the experimental model with impact resistant character. The relationship between convergent-divergent of physical dimension and deformation, stress, pressure, wave speed, time, mass point speed is researched based on impact dimensional analysis. The lamination crack of concrete is also obtained.

The Small Partition Experiment and Numerical Simulation Used to Explosive RDX-8701

In this paper, shock initiation experiments on the explosive RDX-8701 were performed to obtain in-situ pressure gauge data for the purpose of determining the critical gap thicknesses. The pressure waves are got by manganin-constantan composite 2-D Lagrange gauge. The process of initiation has been calculated near the critical point by 2-D Lagrangian analysis method, and discussed the reason. By 2-D Lagrangian analysis method, we gain the Ignition and Growth reactive flow model with proper modeling parameters. The RDX-8701 model was then tested by LS-DYNA code on existing small scale gap tests with good results. The RDX-8701 model can be applied to chock initiation scenarios that have not or cannot be tested experimentally with a high level of confidence in its predictions.