Hypervelocity Impact Simulation Of TC4Alloy Based On Material Point Method

Currently, space technology has made rapid development and brilliantachievements, more and more spacecrafts and artificial satellites are launched to theearth orbit. At the same time,a lot of space debris remain in earth orbit,the relativevelocity of the impact of orbital debris and space craft can reach10km/s，and thenumber of those debris are increasing rapidly，which is a great threat against securityof human’s spaceflight.To improve the space environment， the study ofhypervelocity is vital. The numerical simulation is much simple compared with theexperiment approach and capable of observing the whole impact process.Material point method is a new method for numerical simulation.The materialpoint method combines the advantages of Eulerian and Lagrangian description ofmotion. It eliminates the drawbacks of numerical difficulties associated with meshdistortion and element entanglement in Lagrangian and with the advected quantitiesin Eulerian description. The material point method is well suitable to thehypervelocity impact problem, in which extreme large deformation will occur.Titanium alloys are one of the important Aerospace Materials，TC4is the mostclassical one.This thesis introduces the physical and chemical properties of TC4alloy and reviews its application in the spaceflight. According to the actual situation，the aviation material TC4is a good choice for the work. The simulation is based onthe model that a spherical and a cylindrical projectile impact individually to thedifferent plate at7000m/s super high speed. The formation of penetrating hole anddebris cloud is simulated. And the front speed of the debris cloud is given. Thesimulation datum will provide a useful reference for new aerocraft designs,newmaterials application and protecting spacecraft against damage, and also it willprovide theoretical basis for the future researches about hypervelocity impact of TC4alloy.