DETERMINATION OF THE CREEP CRACK INITIATION PROPERTIES USING PRE-CRACKED SMALL PUNCH TESTS

J. M. Alegre  I.I. Cuesta  C. Rodriguez  F.J. Belzunce     

Anales de la Mecánica de la Fractura, nº 33 . 2016 . Pág. 82 -87
Ver (.pdf): Anales33-012

Resumen: The use of pre-cracked small punch creep test specimens (p-SPCT) is analyzed in this paper as an alternative method to obtain the Creep Crack Initiation (CCI) time in those cases where there is not enough material to use CT specimens. The material selected was an AZ31B magnesium alloy. The geometry of the specimens used was square of 10 × 10 mm with a thickness of 0.5 mm. An initial crack-like notch was created in the SPT specimens by means of a laser microcutting technique. Conventional compact specimens (CT-20) have been tested at T=150ºC as a reference for CCI determination. The definition of an equivalent load for p-SPCT was seen to be a good methodology, and a l parameter was defined to convert the p-SPCT to an equivalent C(T) load that produces the same CCI time. The influence of temperature and material on the lambda parameter must be investigated.

LocalizaciónSan Sebastián

Grupo de Integridad Estructural (Universidad de Burgos), Escuela Politécnica Superior. Av Cantabria s/n 09006 – Burgos (Spain)
Grupo de Integridad Estructural (Universidad de Burgos), Escuela Politécnica Superior. Av Cantabria s/n 09006 – Burgos (Spain)
Escuela Politécnica Superior de Ingeniería. Campus de Gijón (Universidad de Oviedo), Escuela Politécnica Superior. Av Cantabria s/n 09006 – Burgos (Spain)
Escuela Politécnica Superior de Ingeniería. Campus de Gijón (Universidad de Oviedo), Escuela Politécnica Superior. Av Cantabria s/n 09006 – Burgos (Spain)