An investigation of bending fatigue crack propagation in structural steel by the measurement of indirect parameters

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• 作者：Ana Maria Gontijo Figueiredo (1)
  Gabriel de Oliveira Ribeiro (1)
  Jos茅 Felipe Dias (2)
  Paulo Jos茅 Modenesi (3)
  Felipe Leonardo Pereira Queiroz (4)
  Juliana de Oliveira Vasconcelos (4)
  Humberto Alves da Silveira Monteiro (4)
  
  1. Departamento de Engenharia de Estruturas ; Universidade Federal de Minas Gerais ; UFMG ; Belo Horizonte ; MG ; 31270-901 ; Brazil
  2. Faculdade de Engenharia ; Universidade de Ita煤na ; Ita煤na ; MG ; 35680-142 ; Brazil
  3. Departamento de Engenharia Metal煤rgica e de Materiais ; Universidade Federal de Minas Gerais ; UFMG ; Belo Horizonte ; MG ; 31270-901 ; Brazil
  4. Escola de Engenharia ; UFMG ; Belo Horizonte ; Brazil
  
• 关键词：Structural steel ; Bending fatigue test ; Fatigue crack initiation ; Propagation
• 刊名：Journal of the Brazilian Society of Mechanical Sciences and Engineering
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：37
• 期：1
• 页码：305-312
• 全文大小：1,100 KB
• 参考文献：1. Beretta S, Blarasin A, Endo M, Giunti T, Murakami Y (1997) Defect tolerant design of automotive components. Int J Fatigue 19(4):319鈥?33 CrossRef
  2. Broek D (1986) Elementary engineering fracture mechanics, 4th edn. Martinus Nijhoff Publishers, Dordrecht, p 501 CrossRef
  3. Courtney TH (1990) Mechanical behavior of materials, 2nd edn. McGraw-Hill, Long Grove, p 620
  4. Davidson DL, Lankford J (1992) Fatigue crack growth in metals and alloys: mechanisms and micromechanics. Int Mater Rev 37(2):45鈥?6 CrossRef
  5. Dias JF (2006) Estudo do Comportamento 脿 Fadiga em Ferro Fundido Nodular Austemperado (ADI) Sujeitos a Carregamentos de Amplitude Vari谩vel [Study of Fatigue Behavior in Austempered Ductile Iron (ADI) Subject to Variable Amplitude Loads],Tese de Doutorado em Engenharia de Estruturas鈥擠EES, UFMG, Belo Horizonte
  6. Dieter GE (1988) Mechanical metallurgy. McGraw-Hill Book Company, UK 751 p
  7. Dowling NE (1998) Mechanical behavior of materials, 2a edn. Prentice Hall, USA, p 912
  8. Ewalds HL, Wanhill RJH (1993) Fracture mechanics. Arnold DUM Edition, p 304
  9. Hertzberg RW (1989) Deformation and fracture mechanics of engineering materials, 3rd edn. John Wiley & Sons, New York, p 680
  10. Murakami Y (2002) Metal fatigue: effects of small defects and nonmetallic inclusions. Elsevier, Oxford, p 369
  11. Murakami Y, Endo M (1994) Effects of defects, inclusions and inhomogeneities on fatigue strength. Int J Fatigue 16:163鈥?82 CrossRef
  12. Schijve J (1996) Fatigue crack grow under variable-amplitude loading. In: ASM handbook鈥攆atigue and fracture, vol 19. pp 110鈥?33
  13. Shanmugham S, Liaw PK (1996) Detection and monitoring of fatigue cracks, In: ASM handbook鈥攆atigue and fracture, vol 19. pp 517鈥?52
  14. Suresh S (2001) Fatigue of materials, 2nd edn. University Press, Cambridge, p 679
  
• 刊物主题：Mechanical Engineering;
• 出版者：Springer Berlin Heidelberg
• ISSN：1806-3691

文摘

This work analyzes procedures to monitor fatigue crack propagation in smooth specimens made of high-strength structural steel based on the measurement of variations in the induced moment at the fixed support. Bending fatigue tests were performed with strain control for eight different levels of strain amplitude. The moment at the support was recorded during each test and the number of cycles to fracture determined. For each strain amplitude, the average moment at the support was plotted against the time and the point where a significant decrease occurred in the specimen flexibility was identified. From these results, a curve indicating the initial crack detection was built. To verify in each curve the relationship between the crack size and corresponding number of cycles, a set of interrupted fatigue tests was performed. Crack size and position were marked by specimen heating and oxidation followed by cycling to final fracture and fracture surface analyses. The initial results indicate that this methodology can identify the transition from the fatigue crack initiation to the propagation phase.