Numerical Simulation Of Notch Sensitivity About Fragile Materials

Fragile materials play an extremely vital role in all kinds of industries, and the accidents that are caused by the fracture of materials do huge damage to people’s daily life and the nation’s property. Thus, what we should do is attach great importance to the security of the fragile materials and analyze the notch sensitivity ratio of fragile materials.This thesis does research on the sensitivity of fragile materials’ gaps by theoretical analysis and numerical simulation. First and foremost, it brings out an evaluation criterion of material notch sensitivity ratio under impulsive load, what is called impact notch sensitivity coefficient also. Then, it does numerical simulation to pills striking steel plates and organic glass, and calculate their impact notch sensitivity coefficient dividedly. It finds that the notch under impulsive load has little effects on plastic material and huge effects on fragile material. Next, it does numerical simulation to the process of pills striking organic glass on various speed and calculate the impact notch sensitivity coefficient of organic glass concomitantly. The results show that the higher the speed is, the bigger the impact notch sensitivity coefficient is, and the higher the organic glass’s notch sensitivity ratio is, the more easily it may fracture. Last but not least, it does numerical simulation to pills striking organic glass of different notch depth and calculate their impact notch sensitivity coefficient. It turns out that the deeper the notch is, the bigger the impact notch sensitivity coefficient is, and the higher the organic glass’s notch sensitivity ratio is, the more easily it may fracture.