反弹道斜撞击下自由梁结构响应研究

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。

Structural Response of Free-free Beam under Oblique Reverse Ballistic Impact

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 Ref4].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.