Fatigue crack propagation simulation method for CT (Computed Tomography) sample of three-dimensional linear friction welding head

Abstract

The invention discloses a fatigue crack propagation simulation method for CT (Computed Tomography) sample of a three-dimensional linear friction welding head, and belongs to the field of solid-phase welding and fracture mechanics. The method comprises the following steps of establishing a three-dimensional linear friction welding model; firstly, after a three-dimensional linear friction welding model is established in finite element simulation software ABAQUS, submitting operation simulation welding in a job module to acquire a linear friction welding head; then, selecting a micro-area compact tensile sample area, and drawing a stress nephogram sketch; finally, establishing a linear friction welding joint micro-area crack propagation compact tensile sample model, and respectively importing the iges files in the three directions obtained in the step 2 into sketch modules of the three compact tensile sample models; and acquiring crack propagation results in three directions so that the crack propagation trend of the three-dimensional linear friction welding head is estimated. According to the simulation method, a new thought is provided for research on the fracture behavior of the welded joint, and a large amount of pretreatment and calculation time can be shortened.

Description

technical field [0001] The invention belongs to the field of solid-phase welding and fracture mechanics, and in particular relates to a method for simulating fatigue crack growth of a CT sample of a three-dimensional linear friction welding joint. The method of applying two-dimensional mechanical model to analyze three-dimensional crack behavior involves the study of macroscopic deformation behavior, temperature field and stress field evolution of three-dimensional linear friction welded joints, as well as the study of micro-zone crack propagation behavior. Background technique [0002] Linear friction welding is a solid phase connection technology, which is currently mainly used in the field of aerospace, as a molding technology for the overall blisk of an aero-engine. This technology relies on the frictional heat generated by the relative reciprocating vibration of two weldments to soften the contact surface metal and make the material flow plastically, thereby forming a s...

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Problems solved by technology

Chen Long ([1] Chen Long. Research on Surface Strengthening Process of TC4 Titanium Alloy Welded Joints Based on Residual Stress Analysis [D]. Zhengzhou Aeronautical Industry Management College, 2020.) The effect of residual stress of TC4 laser welded joints on fatigue cracks was studied. Research, and use finite element technology to simulate the impact of shot peening on residual stress, which solves the quenching residual stress field through sequential thermomechanical coupling method, takes the stress field as the initial load condition, and simulates the impact of shot peening on residual stress. The method is only suitable for the model selected in two consecutive analysis steps to establish a completely consistent model, so as to achieve the purpose of sequential simulation of the unchanged model, and cannot be applied to the situation where the model changes

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