CAJ | 학술논문

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。
통과탄환침철모형시험급수치방법론증광활모자모형가교호모의일정범위내충격하재작용하토체동태역학향응。재차기출상분석불동본구모형、수치산법대계산결과영향。분석표명，광활모자모형능극복재교적정수압력급저속하수치계산불은정，여토양、포말모형급 Drucker-Prager 모형상비，기본상능반영토체역학성능，계산결과경합리；용 MM-ALE 산법모의탄환침철시험능극복망격기변소치수치계산곤난，계산정도능득도보증，계산결과여사실상부。해결과대연구무기촉지침철과정중탄두강도、강도、작약안정성급전두부입지후적폭작파배효응구유중요의의。
For simulating the dynamic response of soil under a certain range of impact load caused by projectile penetration,continuous surface cap model was proposed to be used as the dynamic constitutire model of soil.Through model test and numerical simulation,the feasibility and advautages of the model were validated.The influences of different constitutive models and numerical algorithms on penetration depth were analysed.The results show that in the calculation using continuous surface cap model,numerical instability can be overcome in the case of low hydrostatic pressure and low penetrating velocity.Compared with the soil and foam model and the Drucker-Prager model,the continuous surface cap model can more closely reftect the mechanical properties of soil,so,the result will be more resonable.In the simulation of projectile penetration,multi material arbitrary Lagrangian-Eulian (MM-ALE)algorithm was intrduced and it is shown that with MM-ALE algorithm,the mesh distortion and numerical difficulties can be conquered,the calculation accuracy can be thus guaranteed,so that more credible results can be achieved.The results are helpful to study the strength and rigidity of warhead,the stability of explosive during the penetration of projectile and the effect of blast damage after the projectile penetrating into the ground.