Linear friction welding joint uniaxial tension simulation calculation method

Abstract

The invention relates to a linear friction welding joint uniaxial tension simulation calculation method, and belongs to the technical field of welding and fracture mechanical numerical simulation. The method comprises the following steps: dividing welding model sub-regions, and distributing region serial numbers; establishing a high-temperature alloy linear friction welding finite element model; determining the size and the cutting position of a micro-tensile sample; and establishing a micro-stretching finite element model of the high-temperature alloy linear friction welding joint. Based on a high-temperature alloy linear friction welding numerical simulation result, the welding stress final states of different sub-regions serve as the stress initial state of joint micro-stretching, and the mechanical property difference of different regions of a high-temperature alloy linear welding joint micro-stretching model is fully considered. By means of calculation forming, calculation continuity is guaranteed, predictability of a stress concentration area is guaranteed, and the method has important value and significance on theoretical research of fracture mechanics of the high-temperature alloy linear welding joint.

Description

technical field [0001] The invention belongs to the technical field of numerical simulation of welding and fracture mechanics, and relates to the formation process, mechanism and physical field evolution law of linear friction welding of high-temperature-resistant materials for aerospace, and the dynamic evolution law and exploration of fracture damage of linear welded joints. Specifically, it is a uniaxial tensile simulation calculation method of a linear friction welding joint. Background technique [0002] Linear friction welding is a thermal-mechanical coupling (energy conversion) process and solid-state metallurgical process under high temperature and high pressure, which overcomes the limitations of other friction welding processes on the shape of the welded workpiece. High-temperature alloys are irreplaceable key materials for high-temperature components such as turbine blades, guide vanes, high-pressure compressor disks, and combustion chambers of aviation, aerospace...

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Problems solved by technology

[0005] In his master’s thesis “Research on Fracture Failure of Superalloys During Plastic Deformation” by Deng Jiao from Central South University, he studied the local necking law of superalloys during high-temperature tensile deformation, and analyzed the effects of deformation parameters and initial aging time on the characteristic parameters of the damage model. influence, established the mathematical expression of the characteristic parameters of the damage model based on parameters, and obtained the GTN damage model parameters of the superalloy tensile deformation, but did not involve the uniaxial tensile simulation analysis of the superalloy joint; Xu Kaixuan of Nanjing University of Aeronautics and Astronautics His master's thesis "Research on Modeling and Numerical Simulation of Ductility Fracture Behavior of GH4169 Nickel-based Alloy" has carried out theoretical modeling and numerical simulation research on the plastic deformation and ductile fracture behavior of the GH4169 nickel-based superalloy used in disks, using the inversion method The B-W model material parameters of the GH4169 alloy were optimized and estimated, and the finite element calculation and analysis of the tensile response of the GH4169 smooth and notched specimens was carried out based on the B-W model, but it was still only for the superalloy raw materials

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