摘要
研究了均匀矩形截面自由梁中部在小尺寸、平头、刚性、圆柱形弹体正撞击下的变形及穿透过程。当子弹冲击速度接近或高于临界穿透速度时 ,在梁上与子弹接触区的周围会形成一个剪切冲塞 ,子弹通过冲塞作用在梁上的剪应力会引起梁的整体弯曲变形。通过动力分析 ,确定了子弹穿透梁的临界穿透速度。对子弹穿透梁的局部剪切过程和梁的各个变形阶段进行了数值计算 ,估算出局部剪切能、梁弯曲变形能。
An analysis is presented to model the perforation process of a rigid plastic free free beam with uniform rectangular cross section when it is struck normally by a small size flat nosed cylindrical missile at the middle of its span.At a speed above the ballistic limit,the missile generates a plug at the periphery of the contact region.The plug tends to separate from the beam,and transverse shear strain occurs in the area around the plug and the missile.At the same time,the shear force applying on the beam through the plug causes the beam to move in the impact direction with bending deformation.Numerical calculatins are made for several ratio of beam length to thickness.Above the ballistic limit,the residual kinetic energies of the beam and the missile,the energy dissipation due to bending of the beam and due to shear in the process of plug formation are estimated.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2000年第3期200-207,共8页
Explosion and Shock Waves
基金
国家自然科学基金项目 !(19842 0 0 1
19872 0 48)
山西省留学回国人员科研基金项目
教育部留学回国人员科研启动基金项目
关键词
自由梁
冲塞
移行铰
穿透
变形
free-free beam
plugging
moving hinge
perforation
