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  Heavy forging

 
 
 
   

Stamping

 
 
 

 

Novel spinning process

 

 
Sponsored by Production, Teaching & Research Collaborative Project between Guangdong Province and Ministry of Education of China, 2007-2009.
 

Sponsored by NSFC, China, 2005-2007; Industrial Science and Technology Project (ISTP), Guangdong, 2007-2008; Provincial Natural Science Foundation (PNSF), Guangdong, 2005-2006.

 
 
   

Shot Peening

 

 

Research on Shot peening Strengthening Mechanism of Civil Aircraft Components with Corrosion Damage

Derived from: Research on Shot peening Strengthening Mechanism Based on Civil Aircraft Components with Corrosion Damage
2012~2014 Project of collaborative supported by Fund of National Natural Science Foundation of China and Civil Aviation Administration of China(No:61179051)

  With the growing trend of aging for civil aircraft, some problems such as fatigue, corrosion and wear for part of aricraft components are increasingly prominent, which had brought threat to the safety of civil aviation flight. In this paper, the aircraft components with corrosion damage are selected as research object, theoretical analysis and experimental study were employed, shot peening strengthening mechanism of aircraft component with corrosion damage are investigated deeply. Firstly, the finite element numerical model of shot peening process with random-shots beam were established; the influence of different geometrical features, shot peening methods and process parameters on distribution law of residual stress were studied; The influence of residual stress field, organization structure and surface roughness on shot peening effect were analyzed; The shot peening process and fatigue performance of spcimens were investigated and theoretical analysis results were verificated by experimental research.
1 Eatablishment of finite element simulation model of shot peening process with random-shots beam

  Based on Abaqus.6.10, the finite element simulation model of shot peening process with complicated surface geometrical features were established, parametric control of which were implemented, as shown in Fig.1. Model simplified method based on automatic transmitting of the historical information, rapid modeling method based on movement vector were put forward, a series of key issues were worked out; Calculation method of surface coverage was put forward, which implemented the quantitative analysis of influence of surface coverage on distribution law of residual stress; Some abaqus-oriented subprograms were developed by employing Python language for estalishing random-shots geometrical model, auto-committing job files and rapid modelling based on movement vector.

 

Fig.1 Finite element simulation model with random-shots beam
2 Distribution of residual stress for different geometric features, shot peening methods and process parameters
  The distribution law of residual stress for different geometric features (such as plane, convex arc, oblique plane and concave arc), shot peening method (including fixed injection direction and fixed injection angle) and process parameters(including almen intensity and surface coverage) were investigated, the distribution of residual stress is shown in Fig.2. The results show that surface residual stress is not only affected by almen intensity and surface coverage but also additional stress and the contact relationship between shots and target.

            (a) Stress distribution cloud


 

       

          

(b) Distribution curve of surface residual stress
Fig.2 Stress distribution of residual stress for shot peening

3 Fatigue performances under different shot peening strengthening and grinding states
  Fatigue performance of spcimens (as shown in Tab.1) for different shot peening strengthening and grinding states were investigated based on MSC.Fatigue and experimental research. The results show that:1) For spcimen-1, fatigue cracks initiate at surface of concave arc of component, and cracks growth rate is fast; 2) For spcimen-2, fatigue cracks initiate at surface of side faces near by symmetrical center line, the strengthening effect is not significant by comparing with spcimen-4; 3) For spcimen-3, fatigue cracks initiate in sub-surface near by concave arc, the strengthening effect is significant by comparing with spcimen-4. The fatigue life and fracture morphology are shown in Fig.3 and 4.

 

        

            Fig.3 Fatigue life of spcimens

Fig.4 Fatigue fracture morphology of spcimens under different shot peening states

 




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            Address:School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou, China   
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                  Research Interses: Plastic forming theory, technology and equipment, CAD/CAE/ CAM, etc