反弹道斜撞击下自由梁结构响应研究

摘要

反弹道撞击实验在材料与结构动力学响应研究领域中已有广泛应用,相比正向撞击实验,反弹道实验可在自由梁上加装测量装置,得到更精确的测试结果.开展了自由梁20°斜撞击的反弹道实验,使用数字图像相关方法测试了弹体的实时动态响应情况,引入失效判据,并结合数值模拟分析,求解了轴向与横向载荷交互作用下的自由梁弯曲形貌.结果表明:考虑轴向力的计算结果与实验吻合较好,且优于文献[4]给出的自由梁计算模型;当质量比mγ≥10时,正反弹道具有较好的等效性,该方法亦可用于求解弹体在非正侵彻过程中的结构响应.%Reverse ballistic impact test has been widely used to research the materials and structural dynamic response,in which the measuring devices can be installed on the free-free beam to obtain the more accurate measured results.The 20° reverse ballistic oblique impact tests of free-free beam are carried out,and the digital image correlation (DIC) technique is used to measure the real-time dynamic response.The failure criterion is introduced and the simulated results are considered to solve the dynamic responses of free-free beam under axial and transverse impact loading.The results show that the calculated bending shape agrees well with the experimental result,and is better than that in Ref[4].The reverse ballistics is equivalent to the forward ballistics for the reverse ballistic mass ratio mγ ≥ 10.The proposed method can also be used for solving the dynamic response of projectile during penetration.