Method of welding deformation prediction and analysis of large nuclear power structure and system thereof

Abstract

The invention discloses a method of welding deformation prediction and analysis of a large nuclear power structure. The method comprises: acquiring test deformation values of a typical welded joint from a typical joint inherent-deformation database; using thermo-elasto-plastic finite elements to simulate and calculate simulated deformation values of the typical welded joint. determining whether the simulated deformation values and the test deformation values are consistent; if yes, extracting intrinsic deformation values of the typical joint, and storing the inherent deformation values into the database; otherwise, adjusting a thermo-elasto-plastic model for recalculation until the simulated deformation values and the test deformation values are consistent, and eventually storing the exact obtained intrinsic deformation values into the database; and when welding deformation of the large structure is predicted, retrieving the corresponding inherent deformation values of the joint from the typical joint inherent-deformation database, converting the inherent deformation values of the joint into inherent strain values to apply the inherent strain values in a weld seam area, and quickly obtaining the deformation through elastic calculation. According to the method, the time of analysis and calculation is greatly reduced, and the accuracy of a prediction result can be effectively guaranteed.

Description

technical field [0001] The invention relates to an analysis method and system thereof, in particular to a prediction analysis method and system thereof for welding deformation of a large-scale nuclear power structure. Background technique [0002] In the process of manufacturing and installing large structural parts such as nuclear power nuclear equipment and steel structures, more welding connection methods are used. Due to the highly concentrated instantaneous heat input of welding, uneven heating and cooling cause abnormalities in the weld and its surrounding areas. Uniform expansion and contraction, causing plastic deformation of the weld seam and its vicinity, followed by welding deformation in the welded structure. The occurrence of welding deformation not only affects the production and installation of nuclear power equipment and steel structures, but also affects their performance and service life. Therefore, welding deformation control is very important in the manu...

AI Technical Summary

Problems solved by technology

However, for large-scale nuclear power structures, the use of thermoelastic-plastic finite element numerical simulation for numerical analysis and calculation of its deformation requires a large computer capacity, long period of analysis and calculation, and high calculation costs.

making it difficult to effectively apply in the construction of large structures

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