无限冰介质中爆炸裂纹扩展机理与数值模拟  

Expansion Mechanism and Numerical Simulation of the Explosion Crack in an Infinite Ice Medium

作　　者：王呼和[1,2] 佟铮[1,2] 邢永明[1] 李进福[1,2] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,呼和浩特010051 [2]内蒙古工业大学爆破工程研究所,呼和浩特010051

出　　处：《实验力学》2009年第5期493-498,共6页Journal of Experimental Mechanics

基　　金：国家自然科学基金(批准号:50869004);内蒙古社会发展领域资金项目

摘　　要：根据冰体力学性能,提出了无限淡水冰介质在爆炸冲击载荷下的压碎区及裂隙区的理论计算方法。利用大型有限元软件ANSYS/LS-DYNA模拟了爆炸载荷下无限区域冰体内裂纹扩展过程,模拟结果与实验结果基本一致,表明采用的损伤断裂模型能够较准确的反映无限冰介质动态力学性能及裂纹成形过程。数值模型可近似计算冰体中裂隙区的半径。数值计算值与理论计算值误差不超过5%,数值模拟结果与实验结果吻合,从而确定了无限区域冰体在-15℃时的基本破坏特征及范围。According to mechanical properties of ice, a calculation method for crush zone radius and crack zone radius in an infinite ice medium under explosion impact loading condition were proposed in this paper. The process of crack propagation was simulated numerically by using large-scale finite element software ANSYS/LS-DYNA. It is found that experimental results are basically consistent with simulated results, which indicates that the model of damage and fracturing correctly reflects the mechanical properties and the process of crack formation in an infinite ice medium. The crack zone radius can be calculated approximately by using the numerical model. The error between numerical calculation results and theoretical calculation ones is no more than 5%. So, the basic fracturing characteristics and scope of an ice medium below -15℃ may be determined.

关 键 词：裂纹扩展 径向裂纹 损伤断裂模型 数值模拟 

分 类 号：TU375[建筑科学—结构工程]