Numerical Simulation About The Spallation Of Materials Under Impact Loading

In the area and departments of aviation and military and engineering application, the spallation of materials is an exceedingly significant phenomenon, as a result, it is undeniable that researching the spallation of materials has vital practical significance. This thesis mainly researches the character of spallation of steel plate and PMMA plate.This thesis does research in the character of spallation of materials by theoretical analysis and numerical simulation. First and foremost, this thesis expounds the mechanism of how spallation emerges, the judgment rule of spallation, the measurement of spallation strength and the method of calculation of the spallation thickness. Afterwards, it achieves the particle model by VB programming modeling, and simulates the spallation process of the flyer striking steel plate and PMMA plate by SPH Meshless Method. Last but not least, this thesis analyzed the effects that flyer’s speed and target card’s thickness have on the character of spallation of target materials. This thesis adopts Maximum Tensile-Stress Criterion to judge whether the material has spalled, and analyses and calculates the spallation thickness and the width of spallation affected zone. Apart from this, it expounds the mechanism of how the second spallation emerges and summarizes the diverse of the spallation phenomenon of steel plate and PMMA plate.SPH Meshless Method decreases the difficulty caused by mess distortion and is appropriate to handle all kinds of application problems of high velocity impacts and dynamic fractures that relate to large deformation. The numerical simulation of this thesis provides certain reference value for improving the safe reliability of materials.