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Prediction by Genetic Algorithm and measurement by center hole drilling of residual stresses of MAG weldment

Farrahi, G. H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.4028/www.scientific.net/AMR.83-86.738
  3. Abstract:
  4. In the present work, specimens were cut out from St-37 plates with 19 mm thickness. The thickness of plates was reduced to 12.5 mm by milling and grinding operations. Then a standard V-shaped fillet was made on one edge of the plates. Two plates were butt-welded by standard metal arc gas (MAG) welding process. Residual stresses induced by welding were measured on 20 specimens by centre hole drilling. Load controlled axial fatigue tests were carried out to determine the fatigue life of specimens. Crack growth rates were obtained from experiment. Fractography of specimens was performed. Genetic Algorithm (GA) was employed for prediction of residual stress value in weldments using the crack growth rates obtained from experiments. The results show that, by using the measured crack growth rates and GA model, residual stresses can be estimated with a good approximation
  5. Keywords:
  6. Fatigue life ; Genetic algorithm ; Hole-drilling method ; MAG welding ; Residual stress ; Axial fatigue tests ; Crack growth rates ; Cut out ; Grinding operations ; Hole drilling ; Hole drilling method ; MAG-welding ; Standard metal ; Two plates ; Welding process ; Weldments ; Cracks ; Drilling ; Fatigue of materials ; Fatigue testing ; Fractography ; Fracture mechanics ; Gas welding ; Residual stresses ; Genetic algorithms
  7. Source: Advanced Materials Research, 2 November 2008 through 5 November 2008 ; Volume 83-86 , 2010 , Pages 738-745 ; 10226680 (ISSN) ; 0878492976 (ISBN); 9780878492978 (ISBN)
  8. URL: http://www.ttp.net/978-0-87849-297-8/10.html