B4C/Al复合板中应力波行为分析（Ⅰ）

依据7.62mm穿甲燃烧弹与B4C,Al板的物理和力学特性,提出弹、板的力学模型;在此基础上,给出弹板碰撞后B4C/Al复合板的弹性动力学方程,建立应力波的传播模型,讨论了应力波传播时复合板的力学行为,最后确定了复合板承受的初始冲击应力。理论分析表明：一维应变条件的B4C和Al板的弹性极限高于一维应力条件下的值;弹、板间的作用力服从指数衰减规律;B4C板的初始应力高于430MPa时,应力波的作用使Al板在卸载过程中发生反向屈服。

Analysis on Stress Waves Propagation in B4C/Al Composite ( Ⅰ)

According to the mechanical and physical properties of 7.62 mm API and B4C, Al plates, the mechanical models of them are put forward. Based on the models, the equation of dynamic elasticity of B4C/Al composite and the model of stress waves propagation in the composite are built. Then the correlative mechanical relationships of the composite are discussed while the stress waves propagate in it. Finally, the initial impact stress of the composite is determined. Theoretical analysis demonstrates that under the condition of one-dimensional strain, the elastic limits of both B4C and Al are higher than those under the condition of one-dimensional stress, and the stress between the projectile and plates attenuating exponentially. When the initial impact stress is higher than 430 MPa in B4 C plate, counter yielding will occur in Al plate as the result of stress unloading.