航空用防弹复合材料弹道极限速度的估算

 结合实验对物理模型法和统计模型法进行了分析。在分析误差原因的基础上,采用量纲分析法对S.Tsai的物理模型法做了有效的修正,解决了摩擦阻力项系数的表征和求值方法,并提出了用修正的物理模型法计算弹道极限速度的步骤。同时,考虑了弹速对能量吸收的影响,对统计模型法进行了合理的修正。通过实验验证得出,修正后的 2种方法提高了弹道极限的估算精确度

ESTIMATE OF BALLISTIC LIMIT VELOCITY OF COMPOSITE PANELS FOR AVIATION APPLICATION

The estimate of ballistic properties of fiber composites is a very important problem to the ballistic composites research and application, especially to the structure design and process optimization. The two traditional methods to estimate ballistic properties of composites, physical model method and statistical model method, were analyzed through lots of testing. S.Tsai's physical model method was amended successfully on the basis of the error analysis. It was put forward that friction was a way composite panel absorbed energy, especially when the thermoeffect of thermoset composites was small. So energy absorption of friction drag should not be neglected. By dimensional analysis, the definition and evaluation methods of coefficient of friction drag item were set. The steps of calculating ballistic limit velocity by amended physical model method were revealed as well. The statistical model method was amended by including the influence of projectile velocity on energy absorption. Therefore, the error of the amended model was reduced. It was found that the statistical model method has more limits in practical use than the physical model method by comparison.