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
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[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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