动态拉伸断裂的物理判据研究

贺红亮

doi:10.11858/gywlxb.2013.02.001

动态拉伸断裂的物理判据研究

doi: 10.11858/gywlxb.2013.02.001

贺红亮^,

中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室，四川绵阳 621900

详细信息

通讯作者:
贺红亮 E-mail:honglianghe@caep.ac.cn

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出版历程
- 收稿日期: 2013-03-13
- 修回日期: 2013-03-13
- 发布日期: 2013-04-15

Physical Criterion of Dynamic Tensile Fracture

HE Hong-Liang^,

National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang 621900, China

摘要

摘要: 介绍了动态拉伸断裂物理判据的基本内涵，基本思想，实验依据和实验验证。基于对动态拉伸断裂细微观物理机制和过程特征的认识，建立了损伤度函数模型和逾渗软化函数，提出了两个损伤特征物理量，即聚集临界损伤度（Dl）和断裂临界损伤度（Df），描述了断裂事件由缓慢演化过渡到特征临界状态、再到灾变断裂的演化规律。该物理判据是动态拉伸断裂的一种物理约束，表征了材料失效破坏与损伤演化的内禀特性，为预测复杂加载应力和复杂几何构型的动态拉伸断裂问题提供了可能性。
- 拉伸断裂 /
- 损伤演化 /
- 物理判据
Abstract: A physical criterion of dynamic tensile fracture has been introduced, based on the knowledge of the micro-mechanism and the measurement of the damage evolution. The physical criterion has suggested two critical damage parameters, named as the critical void coalescence damage Dl and the critical fracturing damage Df. These two parameters are associated with a damage function model and a percolation-softening function, by which the fracture process is characterized as that the damage slowly increases in a linear manner from the initial state (D=D0) to the void linkage state (D=Dl), then changes to a nonlinear growth and rapidly approaches to the critical fracturing state (D=Df), while a final step catastrophically leads to the complete fracture state (D=1.0). Experimental measurements and numerical simulations for both of the plate impact and the cylindrical tube have verified that these two parameters (Dl and Df) physically constrain the dynamic tensile fracture and may be considered as the intrinsic material constant. Application of this physical criterion for the prediction of dynamic tensile fracture under intricate loading and for complex geometrical system has been discussed.
- tensile fracture /
- damage evolution /
- physical criterion

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