Cohesion-magneto-mechanical coupling model-based interface crack evaluation method

A technology of coupling model and cohesive force, which is applied in the direction of material magnetic variable, application of repeated force/pulsation force to test material strength, measurement device, etc., can solve problems such as singularity of crack tip stress, yield, and complex stress field distribution

Pending Publication Date: 2019-08-06
HEFEI UNIV OF TECH
View PDF2 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the discontinuity of the coating/substrate structure and the heterogeneity of the material, the stress field distribution at the interface is very complicated, and there are problems such as st

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cohesion-magneto-mechanical coupling model-based interface crack evaluation method
  • Cohesion-magneto-mechanical coupling model-based interface crack evaluation method
  • Cohesion-magneto-mechanical coupling model-based interface crack evaluation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0077] In this embodiment, the interface crack evaluation method based on the cohesion-magnetomechanical coupling model, the interface is the coating interface, which refers to the coating interface with a ferromagnetic coating formed on the surface of the substrate, and the interface crack evaluation refers to the coating interface. Cracks in the interface between the coating and the substrate were evaluated.

[0078] The interface crack evaluation method in this example is to combine the traction force σ of the cohesive force element at the coating interface with the magnetomechanical effect to establish a cohesive force-magnetomechanical coupling model; the initial opening displacement u of the cohesive force element is obtained through finite element simulation x ;Use the initial opening displacement u x According to the cohesion-magnetomechanical coupling model, the magnetic field strength threshold H for interface fatigue crack initiation was obtained max , The maximum ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a cohesion-magneto-mechanical coupling model-based interface crack evaluation method. According to the method, the traction force and magnetic mechanical effect of the cohesionunit of a coating interface are combined, so that a cohesion-magnetic mechanical coupling model is established; the initial opening displacement of the cohesion unit is obtained through finite element simulation; fitting relationships between a magnetic field intensity threshold value, the maximum magnetic field growth speed of the cohesion unit and crack propagation speed during the growth of the fatigue crack of the interface are calculated through the cohesion-magnetic mechanical coupling model on the basis of the initial opening displacement; and the maximum magnetic field intensity of acquired self-generated magnetic signals at the interface is compared with the magnetic field intensity threshold value, so that whether the crack grows can be judged; the crack propagation speed of theinterface under the action of different fatigue circulation cycles and the crack propagation length of the interface during the fatigue service process of a coating can be obtained according to the fitting relationships. With the method of the invention adopted, the evolution behavior of the fatigue crack of the coating interface can be accurately evaluated.

Description

technical field [0001] The invention relates to a spontaneous magnetic flux leakage non-destructive detection method, in particular to a detection method for evaluating the evolution behavior of fatigue cracks at the ferromagnetic coating interface. Background technique [0002] Coatings prepared by advanced surface engineering technologies such as laser cladding, plasma surfacing, and supersonic flame spraying have good wear resistance, corrosion resistance, and high temperature resistance, and are widely used in high-end equipment. As a metastable material structure system, the coating / substrate has a large difference in mechanical properties of heterogeneous materials on both sides of the interface, and fatigue cracks are prone to appear at the interface during the service process. Carrying out relevant coating interface damage detection and evaluation for The safe operation of high-end equipment is of great significance. [0003] As a new non-destructive testing method,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N27/82G01N3/32
CPCG01N27/82G01N3/32G01N2203/0062G01N2203/0073
Inventor 黄海鸿钱正春王江龙刘文杰
Owner HEFEI UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap