导弹战斗部冲击下舷侧梁的动力响应及失效模式分析

根据理想刚-塑性材料模型假设,同时考虑梁的剪切、弯曲及拉伸,分析了均匀矩形截面简支梁中部在中低速、大尺寸、大质量、平头弹体正冲击下的动力响应,得到了梁的初始塑性变形模式及梁的塑性变形过程,并根据有效塑性应变失效准则,分析了简支梁的失效模式,得到了冲击过程中梁的临界失效挠度及吸能量,讨论了梁截面的形状及跨长对梁变形吸能能力的影响.

Analysis of dynamic response and failure mode of boardside beam under impact of missile warhead

A study is proposed for estimating dynamic response and failure mode of simple supported beam with uniform rectangular cross-section subjected to middle and low velocity impact at the middle point of its span by a flat headed heavy projectile with large size.The influence of the shear,axial and bending strains are all taken into account in the study.Based on the rigid-plastic assumption,the plastic deformation model at the initial time and deform process are obtained.Failure model is analyzed using effective plastic strain failure criterion,and the critical displacement and energy absorption of the beam in the impact process are obtained.The influence of beam section shame and beam span length is discussed.