弹体对超高性能混凝土侵彻深度的研究

Research on penetration depth of projectiles into ultra-high performance concrete targets

为了评估超高性能混凝土(UHPC)的抗侵彻性能,对UHPC靶板进行了侵彻试验与数值模拟。首先,利用Φ35 mm火炮对抗压强度为160 MPa的UHPC靶板开展了216~345 m/s速度下的弹体侵彻试验,结果表明:随着弹体速度的增加,侵彻深度与开坑直径皆有明显增加。随后在数值模拟过程中,确立了UHPC的RHT材料模型参数,为了验证材料模型的有效性,采用单轴压缩与霍普金森压杆试验结果对三维有限元模型进行了验证,模拟结果与实验结果吻合良好,表明参数选取科学合理。最后,对弹体侵彻UHPC的过程进行数值模拟,参数化分析了UHPC抗压强度、弹体质量、侵彻速度、弹径、弹头形状对UHPC侵彻深度的影响,并据此推导出弹体对UHPC侵彻深度计算公式。

Aiming to evaluate the penetration resistance of the ultra high performance concrete(UHPC)target,both penetration tests and numerical simulations were carried out on UHPC targets.Firstly,the Φ35 mm gun was used to carry out a series of penetration tests on the C160 UHPC with striking velocities varying from 216 m/s to 345 m/s.The test results show that with the increase of projectile velocity,the penetration depth and crater diameter increase obviously.Besides,UHPC notably decreased the damage to targets caused by the projectile,efficiently reduced the penetration depth and regarding crater damage and crack propagation,which was superior to ordinary concrete in the performance against penetration.Then,3D finite element models were established and the corresponding numerical simulations were carried out.In the process of numerical simulation,the key parameters of the RHT model for UHPC was determined.In order to verify the accuracy of the RHT material model,uniaxial compressive and split Hopkinson pressure bar(SHPB)testing results are used to validate 3D finite element material model.The numerical simulated results exhibited fair agreement with the test data,these observations demonstrated the applicability and validity of the calibrated RHT model.Finally,with the validated RHT material model,parametric studies were further conducted to explore the effect of uniaxial compressive strength of UHPC,projectile mass,projectile striking velocity,projectile diameter and projectile caliber-radius-head ratio on the final depth of penetration values of UHPC targets.Moreover,an empirical formula to predict the depth of penetration is derived according to the numerical simulated data,which can provide a reference for the design and evaluation of the UHPC protective structures against projectile penetrations.