光滑帽子动态本构模型验证及应用研究

刘俊新;杨春和;刘育田

振动与冲击 ›› 2014, Vol. 33 ›› Issue (16) : 201-206.

PDF(1199 KB)
PDF(1199 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (16) : 201-206.
论文

光滑帽子动态本构模型验证及应用研究

  • 刘俊新1,2,杨春和2,刘育田1
作者信息 +

Researches on its validation and application of the dynamic constitutive for continuous surface cap model

  • LIU Jun-xin1,2,YANG Chun-he2,LIU Yu-tian1
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文章历史 +

摘要

通过弹丸侵彻模型试验及数值方法论证光滑帽子模型可较好模拟一定范围内冲击荷载作用下土体动态力学响应。在此基础上分析不同本构模型、数值算法对计算结果影响。分析表明,光滑帽子模型能克服在较的静水压力及低速下数值计算不稳定,与土壤、泡沫模型及Drucker-Prager模型相比,基本上能反映土体力学性能,计算结果更合理;用MM-ALE算法模拟弹丸侵彻试验能克服网格畸变所致数值计算困难,计算精度能得到保证,计算结果与事实相符。该结果对研究武器触地侵彻过程中弹头强度、刚度、炸药安定性及战斗部入地后的爆炸破坏效应具有重要意义。

Abstract

The special phenomenon that mechanical properties of soil are significantly dependent on the pressure and strain rate and effect of shear dilatation appears due to the formation of lots of micro-pore before shear failure can be described with Continuous Surface Cap Model, so it has been widely used. Through the projectile penetration model test and numerical method, it is demonstrated that Continuous Surface Cap Model can well simulate the dynamic response of soil in a certain range of impact load. Based on the validation, influences of different constitutive model and numerical algorithm on penetration depth were analyzed and the results show that (1) in the Continuous Surface Cap Model, numerical instability can be overcome in the low state of hydrostatic pressure and penetration velocity and what’more compared to the Soil and Foam model and the Drucker-Prager model, due to basically describe the mechanical properties of the soil, the results is more reasonable;(2) the Arbitrary Lagrangian-Eulerian algorithm have the advantages of Lagrange algorithm and Euler algorithm, so the mesh distortion and numerical difficulty and are overcome in simulation of the projectile penetration with the Multi Material Arbitrary Lagrangian-Eulerian (referred to as MM_ALE) algorithm, and besides calculation accuracy can be guaranteed, and the results correspond with the facts. The results are helpful to study strength and stiffness of warhead, stability of explosive during projectile into the ground and the effect of blast damage after projectile into the ground.

关键词

弹丸侵彻 / 光滑帽子模型 / 本构模型 / 数值算法 / MM-ALE

Key words

projectile penetration / continuous surface cap model / constitutive model / numerical algorithm / Multi Material Arbitrary Lagrangian-Eulerian algorithm

引用本文

导出引用
刘俊新;杨春和;刘育田. 光滑帽子动态本构模型验证及应用研究[J]. 振动与冲击, 2014, 33(16): 201-206
LIU Jun-xin;YANG Chun-he;LIU Yu-tian. Researches on its validation and application of the dynamic constitutive for continuous surface cap model [J]. Journal of Vibration and Shock, 2014, 33(16): 201-206

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