The effects of ammonium nitrate on mechanical properties of gun propellant were studied.The tensile strength,elongation percentage and stress-strain curve of gun propellant under different ammonium nitrate contents and particle sizes were determined by tensile experiment method.The results showed that,as the contents of ammonium nitrate increased,the tensile strength,elongation percentage and stress-strain curve of gun propellant was gradually decreased in the first,then increased and decreased in the end.When the ammonium nitrate content was low,the tensile strength of gun propellant was increased gradually with the decreasing of ammonium nitrate particle size;the secondary structure of the ammonium nitrate was formed in launch,both the particle size of ammonium nitrate and the tensile strength of gun propellant were gradually decreased.The higher the ammonium nitrate content was,the larger the particle size was and the worse the mechanical properties of propellant were.%研究硝酸铵对发射药力学性能的影响。采用拉伸实验方法,测定不同硝酸铵含量、粒径下发射药的拉伸强度、伸长率、应力-应变曲线。结果表明,随着硝酸铵含量的升高,发射药的拉伸强度、伸长率、回弹模量、韧性模量先降低、再升高、后降低;在硝酸铵含量较低时,随着硝酸铵粒径的减小,发射药的拉伸强度升高;硝酸铵在发射药中形成次级结构,使其粒径降低,发射药拉伸强度降低;硝酸铵含量越高、粒径越大,发射药力学性能越差。
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