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Identification method for dynamic constitutive parameters of concrete materials based on reverse calculation

A technology of parameter identification and calculation inversion, applied in the direction of analyzing materials, instruments, measuring devices, etc., can solve a large number of test and testing problems, improve efficiency and accuracy, reduce times and costs, and avoid stress wave effects and strain rate effects. Effects of Decoupling Problems

Active Publication Date: 2013-10-09
HUNAN UNIV
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Problems solved by technology

[0004] Aiming at the problem that a large number of tests are required to determine the dynamic constitutive parameters of concrete materials in the past, the purpose of this invention is to propose a fast and effective identification method for the dynamic constitutive parameters of concrete materials, so that only a few physical tests are required. Quickly and accurately obtain the key parameters in the constitutive

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  • Identification method for dynamic constitutive parameters of concrete materials based on reverse calculation
  • Identification method for dynamic constitutive parameters of concrete materials based on reverse calculation
  • Identification method for dynamic constitutive parameters of concrete materials based on reverse calculation

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Embodiment Construction

[0034] Attached below Figure 1-8 , taking the parameter identification of the equivalent strength model of the HJC model of the dynamic constitutive structure of the concrete material as an example, the specific implementation manner of the present invention will be described in detail.

[0035] Concrete HJC constitutive model is a dynamic constitutive model of concrete material in this field that comprehensively considers large strain, high strain rate and high pressure effect. The model takes into account material damage, strain rate effects and the effect of hydrostatic pressure on yield stress, and mainly includes three aspects, namely equivalent strength model, damage model and state equation. Among them, the equivalent strength model is:

[0036] σ * =[A(1-D)+BP *N ][1+Clnε′ * ] (1)

[0037] In the above formula (1), σ * =σ / f c , P * =P / f c with denote the normalized equivalent strength, normalized pressure and dimensionless strain rate, respectiv...

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Abstract

The invention discloses an identification method for dynamic constitutive parameters of concrete materials based on reverse calculation. According to the identification method, a separating type Hopkinson pressure bar (SHPB (Split Hopkinson Pressure Bar)) test of concrete and a corresponding finite element analytical model are comprehensively utilized, a minimum error function corresponding to reflected waves and transmitted waves which are subjected to test measurement and numerical calculation is taken as a reverse calculation object function, and a group of dynamic constitutive parameters of the concrete materials are identified by carrying out searching and evaluation based on an optimized reverse calculation method; the constitutive parameters of the concrete materials can be fast acquired only by carrying out SHPB tests for several times, meanwhile, decoupling problems of an stress wave effect and a strain rate effect are avoided, and the structural response and the material response do not need to be separated; the parameters which are difficult to confirm in a conventional method can be accurately and effectively acquired, the number of times and the cost of physical tests are greatly reduced, and the practical value is relatively good.

Description

technical field [0001] The invention belongs to the technical field of material property identification, and in particular relates to a method for identifying dynamic constitutive parameters of concrete materials based on calculation reverse calculation. Background technique [0002] Concrete is a special composite material, which has excellent properties such as easy forming, durability, and strong bearing capacity, as well as the advantages of abundant raw materials, economic benefits, and suitable for building structures of any size and complex shape. It is used in housing, airport runways and It is widely used in various civil engineering and military facilities such as nuclear power plants. Concrete materials are mainly composed of cement mortar, aggregate and bonding layer. Due to the obvious difference in physical and mechanical properties of cement mortar and aggregate, the irregular shape and uncertain distribution of aggregate, the dynamic mechanical properties of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00
Inventor 刘杰陈睿韩旭姜潮
Owner HUNAN UNIV
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