摘要
利用动力学计算软件AUTODYN-2D,采用拉格朗日网格描述弹、靶模型,对弹径比为0.3、直径为75mm、长225mm的卵形弹垂直侵彻直径为1.6m、厚度为2m的混凝土靶板的过程进行了数值模拟。通过设置静水压和主应力2种拉伸失效模式、不同的混凝土靶板网格尺寸以及不同的销蚀应变分别进行计算,考察以上因素对侵彻深度及靶板前表面损伤面积计算结果的影响。结果表明:3种因素对数值模拟结果的影响显著;靶板网格尺寸选择5.0mm时,计算结果较合理;分别选用2种不同的拉伸失效模式,侵蚀应变取1.5时,计算结果与实验结果均较接近;而当选用静水压拉伸失效模式,侵蚀应变取2.0时,计算结果与实验结果吻合最好。
The AUTODYN-2D hydroeode was applied to numerically simulate the penetration process of the 1.6-m-diameter cylindrical concrete target with the length of 2 m by a 3.0-caliber-radius-head, ogive-nose projectile with the diameter of 75 mm and the length of 225 mm. And the Lagrangian ele- ments were used to describe the projectile and target. The hydro and principal stress tensile failure modes were adopted to analyze the influences of the different mesh sizes of the concrete target and the different erosion criterions of the concrete finite elements on the penetration depth and front-face cra- ter. The results indicate that the above three factors all evidently influence the simulated results. The simulated results are reasonable when the size of the concrete target elements is 5.0 mm. For the two failure modes, when the erosion strain is set at 1. 5, the simulated results are close to the experi- ments. And for the hydro tensile failure mode, when the erosion strain is set at 2.0, the simulated re- sults are in good agreement with the experiments.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2013年第4期425-429,共5页
Explosion and Shock Waves
关键词
爆炸力学
侵彻
拉格朗日网格
混凝土
拉伸失效
网格尺寸
销蚀应变
mechanics of explosion
penetration
Lagrangian mesh
concrete
tensile failure
mesh size
erosion strain
