A Construction Method of Thermal-Mechanical Coupling Constitutive Relationship of Zirconium Alloy Under Neutron Irradiation

A constitutive relation, thermo-mechanical coupling technology, applied in the direction of instrumentation, design optimization/simulation, calculation, etc., can solve the problem of not considering the spatial interaction between dislocations and defects, and achieve wide applicability and scalability, reliable theoretical basis. Effect

Active Publication Date: 2021-12-10
CENT SOUTH UNIV
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Problems solved by technology

[0004] So far, the existing theoretical models can effectively characterize the radiation hardening and softening behavior of zirconium alloys under specific temperature conditions, but the spatial interaction between dislocations and defects is not considered based on the physical mechanism; to report

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  • A Construction Method of Thermal-Mechanical Coupling Constitutive Relationship of Zirconium Alloy Under Neutron Irradiation
  • A Construction Method of Thermal-Mechanical Coupling Constitutive Relationship of Zirconium Alloy Under Neutron Irradiation
  • A Construction Method of Thermal-Mechanical Coupling Constitutive Relationship of Zirconium Alloy Under Neutron Irradiation

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Embodiment Construction

[0065] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0066] A method for constructing the thermal-mechanical coupled constitutive relationship of zirconium alloys under neutron irradiation conditions, comprising the following steps.

[0067] Step 1, consider as figure 1 For the polycrystalline model shown in (a), first select a representative volume unit whose volume is V and contains N grains, such as figure 1 (a) shown. The strain rate tensor of a macroscopic polycrystalline material under an external load and the stress rate tensor It can be obtained by classical homogenization theory, that is,

[0068]

[0069]

[0070] where: f i is the volume fraction of each grain; and are the stress rate and strain rate of grain i, respectively.

[0071] The connection between the local mechanical behavior of a single grain and the macroscopic mechanical behavior can be obtaine...

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Abstract

The invention discloses a method for constructing the thermal-mechanical coupling constitutive relationship of zirconium alloys under neutron irradiation conditions. The method of the invention combines the elasto-viscoplastic self-consistent theory to establish a cross-scale theoretical system from single crystal to polycrystal. The Matlab calculation program can easily, quickly and accurately calibrate the model parameters, and the numerical results of the model can be in good agreement with the experimental data under different external load conditions. The theoretical model framework has wide applicability and scalability, and can provide a reliable theoretical basis for the study of the macroscopic mechanical behavior of nuclear materials.

Description

technical field [0001] The invention belongs to the technical field of metal materials and radiation damage effects, and in particular relates to a construction method of a zirconium alloy thermal-mechanical coupling constitutive relationship under neutron radiation conditions. Background technique [0002] The energy problem is a key problem that needs to be solved urgently and restricts the sustainable development of mankind. Among many new energy sources, nuclear energy is one of the energy sources with the most development potential. The development and utilization of nuclear energy are inseparable from the development of nuclear materials. It can be said that whether nuclear structural materials with good radiation resistance can be developed is the core issue affecting the development of nuclear energy. [0003] Zirconium alloy is an important nuclear structural material, and its advantages include good resistance to neutron radiation, excellent processing performanc...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F113/26G06F119/14
Inventor 肖厦子肖策文夏晓东尹叶薇
Owner CENT SOUTH UNIV
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