Method for evaluating damage accumulation inside steel structure thick plate

Abstract

The invention provides a method for evaluating damage accumulation inside a steel structure thick plate. The method comprises the following steps that firstly, an elastoplasticity damage constitutive model for the steel structure thick plate is built, and the increment form of the model stress component is obtained through derivation; secondly, a corresponding material subprogram is complied for the increment form; thirdly, layered sampling is carried out on the steel structure thick plate in the thickness direction, and the elastoplasticity parameter and damage parameter of each layer of materials are determined; fourthly, a finite element model of the steel structure thick plate is built, the complied material subprogram is introduced into finite element analysis, and different material attributes are given to parameters of materials on different layers; the finite element model is loaded, the damage evolution course of the steel structure thick plate under the effect of the external load is simulated, and therefore corresponding evaluation is carried out. As for the characteristic that the steel structure thick plate is large in thickness, the damage evolution course of the thick plate under the effect of the external load is considered from the perspective of layered material properties, and the evaluation result better conforms to the real damage accumulation of the steel structure thick plate.

Description

technical field [0001] The invention relates to a method for evaluating material damage, in particular to a method for evaluating internal damage accumulation of steel structure thick plates. Background technique [0002] Thick steel plates are widely used in construction projects and bridge projects. The thickness of steel structures used in bridge projects is generally around 50mm, while the thickness of steel plates used in construction projects can reach 130mm. Compared with ordinary thin steel plates, due to the increased thickness of the steel plates, their rolling and processing techniques are different from those of thin steel plates, and such differences often lead to residues of impurities inside the thick plates, which may even lead to Severe center segregation phenomenon. [0003] In addition, the multi-layer and multi-pass welding welding process is usually used for the members with thick steel plate as the profile. The welding of multi-layer and multi-pass wel...

AI Technical Summary

Problems solved by technology

However, the defect of the existing damage model to evaluate the accumulation of damage is that the thick steel plate is regarded as a uniform material. The constitutive relationship and damage accumulation degree of each layer in the thickness direction cannot be simply generalized, so the current damage model is often difficult to accurately evaluate the damage accumulation of thick steel plate materials.

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