Integral computation method of welding residual stress and deformation of super-large structure

Abstract

The invention provides an integral computation method of welding residual stress and deformation of a super-large structure. Components are sorted according to the manufacturing sequence of the super-large structure, and welding joints of each component are sorted according to the welding technological regulation, sequence and manner of each component; sorting is conducted according to the thicknesses, types and groove forms of different welding joints; welding joint equivalent samples with the same sizes as the welding joints of the actual super-large equivalent samples are produced, an equivalent thermal source method is adopted to simulate the residual stress distribution of each type of welding joint equivalent samples to obtain welding seams of the welding joints of each component andthe magnitude of residual stress of a thermal influencing area, and therefore the integral residual stress distribution of the super-large structure is deduced; obtained joint internal original stress is taken as an initial stress according to the positions where the welding joint equivalent samples of each component are located to be imported to a housing unit integral model of the super-large structure to perform elastic finite element computation, and therefore the deformation distribution of the whole super-large structure is finally obtained.

Description

technical field [0001] The invention relates to the technical field of welding residual stress and deformation calculation methods, in particular to an integrated calculation method for welding residual stress and deformation of super-large structures. Background technique [0002] With the progress of human civilization, modern container structures are gradually developing towards large-scale. Large-scale containers and structures occupy an increasingly important position in modern industry, and the manufacture of large-scale container structures is often welded by several modules. After the welding is completed, welding residual stress will inevitably be generated at the welded joint, which will affect the strength, creep, fatigue, stress corrosion cracking and other properties of the overall structure. Accurately understanding the overall residual stress and deformation distribution of large vessel structures plays a decisive role in the safe and reliable operation of the...

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Problems solved by technology

This method takes full account of the advantages that the finite element method can realize the global distribution of residual stress, but the same finite element method is also used for the residual stress analysis of large ultra-thick structures (such as hydrogenation reactors, nuclear power pressure vessels, ship structures, etc.) It is obviously inappropriate, because large-scale structures are generally assembled by tailor-welded parts, which contain a large number of welded joints, and each welded joint contains multiple welds. If the finite element method of the conventional moving heat source model is used Simulating welding residual stress will inevitably cause great calculation difficulties and take a long time

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