Monotonic and Cyclic Crack Tip Plasticity

Janeiro 1984

Monotonic and cyclic plastic zone sizes were measured in a medium strength ferrite-pearlite steel (BM 45) tested in fatigue at 25 Hz at room temperature. Two methods were applied: microhardness and the recently developed ‘fatigue in compression’ technique. The results obtained are discussed in terms of accuracy and reliability.The retardation effect due to overloads was also studied in the same material and is illustrated experimentally as a vs ΔK curve. This effect emphasizes the importance of an accurate evaluation of both the size and shape of the overall plastic zone. The shape and dimensions of the cyclic plastic zones seem to indicate that in ductile metals the steady state of fatigue crack growth occurs under plane strain conditions.

Autores da comunidade :

• 

  L

  Luís Manuel Guerra da Silva Rosa

  ist11630

  Afiliações e fontes

  IST > LAETA

  Laboratório Associado de Energia, Transportes e Aeronáutica

  IST > IDMEC

  Instituto de Engenharia Mecânica

  IST > ICEMS

  Instituto de Ciência e Engenharia de Materiais e Superfícies

  IST > DEM

  Departamento de Engenharia Mecânica

• 

  C

  Carlos Augusto Gomes de Moura Branco

  ist11041

International Journal of Fatigue

17

24

6

1

materials-engineering - Engenharia dos Materiais

eng - Inglês