Ma Tianbao

A Pseudo Arc-Length Method for Numerical Simulation of Shock Waves

A pseudo arc-length method is proposed for the numerical simulation of shock wave propagations. This method passes the discontinuities and establishes adaptive moving meshes in the physical space by introducing the arc-length parameter and transforming the computational domain. Numerical experiments of the Sod problem, double Mach reflection problem and explosion problem demonstrate that this approach is more efficient than traditional numerical methods in capturing and tracking discontinuous solutions of singular or nearly singular problems.

Constitutive model, failure mechanism andnumerical method for reinforced concrete under intensive impact loading

Reinforced concrete has been widely used in the field of civil engineering, and the dynamic mechanical behavior of reinforce concrete under intensive dynamic loading is also a very important requirement for national security. However, the characteristics of its heterogeneity, anisotropy and multicomponent bring many difficulties to the study of its dynamic characteristics. Research progress of mechanical behavior of the reinforced concretes under intensive impact loading were reviewed in this paper, including: 1) the dynamical properties and the macrosopic constitutive laws of the reinforced concretes; 2) mechanisms of the penetration of the reinforced concrete structures; 3) numerical simulation method and software of structural mechanical behavior under intensive impact loading. On this basis, the inadequacy of the research which including the dynamic characteristics, penetration mechanism and numerical methods of the reinforced concretes under intensive impact loading were analyzed, and the further in-depth research work need to do in the future was prospected.

Numerical study on mass loss of high velocitypenetration projectiles due to melting

Based on the Eulerian hydrocode MMIC-2D for explosion and impact problems, both particle mapping method and mass loss model based on heat-melting theory are implanted. High velocity projectiles penetrating into concrete targets are numerically simulated with MMIC-2D. The simulation results are compared with related experimental data, and factors affecting the penetration effect and mass loss of the projectile such as penetration velocity and CRH value are studied.