Abstract: Ultra-high molecular weight polyethylene (UHMWPE) is a material widely used for soft body armor. But the bulletproof property of UHMWPE material during aging has not been fully known, and has not been predicted quantitatively by using formulas. In order to analyze the effects of circumstance and storage conditions on the bulletproof property of soft body armor, the artificially accelerated aging experiments are conducted in the conditions of elevated temperature, hygrothermal circumstance and irradiating with xenon arc lamp. The ballistic tests are conducted toacquire the ballistic limit velocity, thus obtaining the effect law of artificially accelerated aging on bulletproof property. The results indicate that the effect law can be predicted more accurately by equation of linear regression. The ballistic limit velocity attenuation formulas of imported and domestic UHMWPEs were acquired by regression analysis in different aging procedures. The formulas can be used to predicte the variation trend of bulletproof property, and provide the estimation for long-term use and storage of UHMWPE soft body armor. Key

Key words: softbulletproofvest, ultra-highmolecularweightpolyethylene, artificiallyacceleratedaging, anti-penetrationperformance, regressionanalysis