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Method for constructing zirconium alloy thermal coupling constitutive relation under neutron irradiation condition

A thermal-mechanical coupling and constitutive relationship technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as the interaction between dislocations and defects without consideration

Active Publication Date: 2019-12-06
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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  • Method for constructing zirconium alloy thermal coupling constitutive relation under neutron irradiation condition
  • Method for constructing zirconium alloy thermal coupling constitutive relation under neutron irradiation condition
  • Method for constructing zirconium alloy thermal coupling constitutive relation under neutron irradiation condition

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Embodiment Construction

[0066] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0067] A method for constructing a thermo-mechanical coupling constitutive relationship of a zirconium alloy under neutron irradiation conditions includes the following steps.

[0068] 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 crystal grains, such as figure 1 (a) Shown. Under the action of external load, the strain rate tensor of macroscopic polycrystalline material And the stress rate tensor It can be obtained by the classical homogenization theory, namely

[0069]

[0070]

[0071] Where: f i Is the volume fraction of each crystal grain, with They are the stress rate and strain rate of grain i.

[0072] The relationship between the local mechanical behavior of a single grain and the macroscopic mechanical behavior can be obtained by the self-con...

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Abstract

The invention discloses a method for constructing a zirconium alloy thermal coupling constitutive relation under a neutron irradiation condition. According to the method, the elastic-viscous-plastic self-consistent theory is combined, a cross-scale theoretical system from single crystals to polycrystals is established, model parameters can be simply, rapidly and accurately calibrated through an adopted Matlab calculation program, and meanwhile the numerical result of the model can be well matched with experimental data under different external load conditions. The theoretical model framework has wide applicability and expansibility, and can provide a reliable theoretical basis for macromechanics behavior research of nuclear materials.

Description

Technical field [0001] The invention belongs to the technical field of metal materials and radiation damage effects, and specifically relates to a method for constructing a thermo-mechanical coupling constitutive relationship of a zirconium alloy under neutron irradiation conditions. Background technique [0002] The energy issue is a key issue that needs to be resolved urgently and restricts the sustainable development of mankind. Among many new energy sources, nuclear energy is one of the most promising energy sources. The development and utilization of nuclear energy are inseparable from the development of nuclear materials. It can be said that whether the development of nuclear structural materials with good radiation resistance is a 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 properties, and good compatibility...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 肖厦子肖策文夏晓东尹叶薇
Owner CENT SOUTH UNIV
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