混凝土类材料动态拉伸实验中惯性效应的研究  

Inertia Effect in Dynamic Tensile Tests of Concrete-like Materials

作　　者：张书[1] 卢玉斌[1] 赵冬梅[1] 陈兴[1] 

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621010

出　　处：《系统仿真学报》2017年第7期1531-1537,1545,共8页Journal of System Simulation

基　　金：国家自然科学基金(51308480)

摘　　要：目前研究者对于惯性效应在动态拉伸强度中的影响持不同观点,尚没有定论。基于此,利用有限元数值模拟,在不考虑真实应变率效应影响的情况下,采用计及静水压力影响的本构关系模型对动态直接拉伸模型、劈裂实验及层裂实验模型中的试样进行分析。最终发现:混凝土类材料试样由惯性效应产生的动态拉伸强度增强虽然会随着加载应变率的增大而提高,但与相应实验中不同应变率下动态拉伸强度增强的数据相比,其增加量相对实验结果而言很小。因此,惯性效应并不是引起混凝土类材料动态拉伸强度增大的主要原因,其主导因素是真实应变率效应。。The different understanding on the influential degree of the inertial effect does exist among researchers, and it has not been uniformly defined in dynamic tensile tests. The finite element numerical simulation method was employed to analyze the three typical dynamic tensile tests, without considering the real strain-rate effect in these models, where a constitutive model only considered the influence of hydrostatic pressure was used for modeling the specimen in these models. It is found that the dynamic tensile strength of concrete specimens in the three models mentioned is strengthened with the increase of loading strain-rate, owing to the inertial effect, while the increments of dynamic tensile strength obtained from these numerical tests are relatively small, compared with the corresponding experimental data. It means that the real strain-rate effect rather than the inertial effect is the main factor leading to the dynamic tensile strength enhancement of concrete-like materials.

关 键 词：混凝土类材料 拉伸强度 惯性效应 真实应变率效应 数值模拟 

分 类 号：O347.3[理学—固体力学]