In recent years,with the improvement and development of protective armor of tanks and weapons systems,ceramic composite armor is widely used.In order to enhance its protective properties,research efficiency needs to be improved.To save time and cost of the experiment,the equivalent target of armored damage becomes particularly important.All current research only involve the equivalent target penetration damage.However,the protective armor on the battlefield damage is in a variety of ways.To enrich the equivalent target theory and develop the research,this paper studies the equivalent target of the damage of penetration,shock wave and natural fragments in finite element simulation method.By analyzing the damage mechanism of penetration,shock wave and natural fragments,combined with the performance of protective armor protection objectives,this paper proposes corresponding doctrine and index of equivalents,selects 45 steel homogeneous plate as equivalent target.Depending on the different damage situation,this paper selects the appropriate original target,damage element and missile target intersection,and designs simulation programs.Then by using ANSYS/LS-DYNA and AUTODYN which are finite element software,the paper simulates the three kinds of damage with dynamic calculations which can give some useful regular pattern of damage.After the calculation,this paper uses some existing value theory,experiments and self compiled program to verify the results.Conclusions are as follows.The thickness ratio of the 45 steel homogeneous equivalent target and the ceramic composite armor is 1.9~2.1 against penetration,which is positively correlated with the projectile velocity and the target angle.Under the influence of shock wave,the thickness ratio distributes between 1.06 and 1.17 randomly.About natural fragment damage,according to the two kinds of equivalent principle,the thickness ratio is from 0.83 to 1.25 and from 0.95 to 1.18 respectively. |