期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 155, 期 -, 页码 1013-1024出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.08.060
关键词
Concrete model; Concrete slab; Contact explosion; Tensile damage; Numerical simulation
资金
- National Basic Research Program of China (973 Program) [2015CB058000, 2016YFC0305101]
- National Natural Science Foundations of China [51210012, 51238007, 51427807]
To precisely predict the failure performances of cratering and spallation in concrete slabs under the contact explosion, three modifications were made to the original K&C (Karagozian & Case) material model that is #72REL3 in LS-DYNA, i.e. the tensile damage accumulation, relationship between the yield scale factor and damage function, as well as the tensile DIFt. The mechanical properties of normal weight concrete simulated by the modified model were validated by a series of single finite element numerical tests, including unconfined uniaxial compression, triaxial tension and dynamic tension tests. Two field tests were then conducted to study the failure modes of concrete slabs under contact explosion, as well as to verify the modifications. A new erosion criterion referring to the tensile damage was proposed to improve the simulation of the tensile failure of the concrete slab. The modified model and erosion criterion were implemented in LS-DYNA with the user-defined material procedure. The corresponding predictions by the original K&C model were also presented to demonstrate the improved effects of the modifications. Sensitivity analysis of the proposed erosion criterion and tensile DIFt was carried out to investigate the stability of the modified model. (C) 2017 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据