节点文献
水泥稳定碎石的动态本构模型及其在侵爆数值模拟中的运用
Dynamic Constitutive Relation of Cement Treated Macadam and Its Application in the Numerical Simulation in Penetration-explosion
【作者】 辛健；
【导师】 汤文辉；
【作者基本信息】 国防科学技术大学 ， 力学， 2010， 硕士
【摘要】 机场跑道多层结构在承受动能弹侵彻爆炸加载条件下的动态响应过程研究具有重要的战略意义。水泥稳定碎石作为构建机场跑道多层结构的一种基层材料,其动态本构关系是研究弹体侵彻和爆炸加载下跑道整体破坏效果的重要基础内容之一。本文针对多层结构侵爆毁伤效应数值模拟需求对水泥稳定碎石材料动态本构关系进行了一些探索研究工作。主要内容包括:通过对水泥稳定碎石材料构成成分分析,发现其与水泥混凝土成分之间具有相似性,从而提出水泥稳定碎石可采用水泥混凝土的本构模型进行描述,两者的性能差异可以用单轴抗压强度这一指标来表征。确定了将单轴抗压强度归一化的RHT模型。通过对RHT模型进行详细分析,将众多参数分为三类,得出一套方法确定水泥稳定碎石模型各个参数的取值。为了进行参数敏感性分析,利用AUTODYN软件建立介质内部装药爆炸的计算模型,通过与实验数据对比验证了模型合理性。模拟了碎石在爆炸加载情况下破坏过程。选取损伤面积作为破坏程度的量化指标,利用图像处理软件得到损伤面积,通过改变单一参数的办法,得到了爆炸过程中各个参数的敏感性表。最后建立了侵爆全过程的计算模型,并将得到的水泥稳定碎石RHT模型运用于侵爆弹作用下多层介质毁伤效应的数值模拟。
【Abstract】 It is of strategic important to study on the responses of multi-layer structure of the airport runway under dynamic loads of penetration and explosion. The dynamic constitutive relation of cement treated base courses is an important component of the study on damage effects for anti-runway penetrating-exploding submunition. In order to meet demand of numerical simulation of penetration-explosion damage effect on the multi-layer structure, dynamic constitutive relation of cement stabilized macadam material was carried out in this study. The main contents include:The component of cement treated macadam was analyzed first in this paper. The constitutive model of concrete material can be used to describe its Behavior Because of the similarity between the two materials. The different performance between the two can be measured by uniaxial compressive strength. Therefore, RHT model is selected as the constitutive model of cement stabilized macadam material under penetration and explosion. Detailed analysis of the RHT model was made and parameters were divided into three categories. A set of methods to determine the values of the parameters of model was summarized. Set the reference value for parameter sensitivity analysis. AUTODYN software was used to establish a medium internal explosion numerical simulation method, which was verified when compared with the experimental data,to analyze the sensitivity of parameter under explosive loading .Damage area was selected as a quantitative index of damage. The area was obtained accurately by photo processing software. The Explosion sensitivity table of each parameter was calculated. Finally, a simulation of was established to describe the whole process of kinetic energy missile’s penetration-exploding with the studied cement treated macadam model.