Semi-empirical equations for the dynamic strength enhancement of concrete-like materials
Semi-empirical equations for the dynamic strength enhancement of concrete-like materials
复制标题
类混凝土材料动态强度增强的半经验方程
DOI：
10.1016/j.ijimpeng.2013.04.005
复制
发表时间：
2013-10-01
影响因子：
5.1
通讯作者：
Wen, H. M.
中科院分区：
文献类型：
--
作者：
Xu, H.;Wen, H. M.
SHPB试验经常被用来表征混凝土类材料的动态抗压强度，这对于建立可靠的数值模拟本构方程是非常重要的。然而，SHPB试验数据需要正确解释，因为最近的研究表明，SHPB试验中发现的表观抗压强度增强可能是材料固有行为(速率敏感性)和惯性约束等影响的组合。为此，提出了混凝土类材料动态强度提高的半经验公式。这些方程是基于最近的数值分析，即混凝土类材料的动态拉伸试验没有惯性约束效应，并假定在相同的应变率下，仅由于应变率效应引起的抗拉强度和抗压强度的增量相等。结果表明，本文的半经验公式与已有的混凝土材料试验数据吻合较好。(C)2013爱思唯尔有限公司。保留所有权利。
SHPB tests are often employed to characterize the dynamic compressive strengths of concrete-like materials which are very important for the construction of reliable constitutive equations used in numerical simulations. The SHPB test data, however, need to be interpreted correctly as recent studies have revealed that the apparent compressive strength enhancement found in the SHPB tests might be due to a combination of effects such as material inherent behavior (rate sensitivity) and inertial confinement. To this end, semi-empirical equations are suggested for the dynamic strength enhancement of concrete-like materials. The equations are formulated on the basis of the recent numerical analysis that dynamic tensile tests on concrete-like materials have no inertial confinement effects and the assumption that the increments of the tensile and compressive strengths due to strain rate effects only are equal at the same strain rate. It is shown that the present semi-empirical equations are in reasonable agreement with available test data for concrete materials. (c) 2013 Elsevier Ltd. All rights reserved.