A study on fatigue crack growth behavior subjected to a single tensile overload : Part I : An overload-induced transient crack growth micromechanism

Download
  1. (PDF, 690 KB)
  2. Get@NRC: A study on fatigue crack growth behavior subjected to a single tensile overload : Part I : An overload-induced transient crack growth micromechanism (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/j.actamat.2010.09.049
AuthorSearch for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleActa Materialia
Volume59
Issue2
Pages485494; # of pages: 10
SubjectFatigue crack growth; Overload; Crack closure; Electric potential; Neutron diffraction
AbstractNeutron diffraction and electric potential experiments were carried out to investigate the growth behavior of a fatigue crack subjected to a single tensile overload. The specific objectives were to (i) probe the crack tip deformation and fracture behaviors under applied loads; (ii) examine the overload-induced transient crack growth micromechanism; (iii) validate the effective stress intensity factor range based on the crack closure approach as the fatigue crack tip driving force; and (iv) establish a quantitative relationship between the crack tip driving force and crack growth behavior. Immediately after a single tensile overload was introduced and then unloaded, the crack tip became blunt and enlarged compressive residual stresses in both magnitude and zone size were observed around the crack tip. The results show that the combined contributions of the overload-induced enlarged compressive residual stresses and crack tip blunting with secondary cracks are responsible for the observed changes in the crack opening load and the resultant post-overload transient crack growth behavior.
Publication date
LanguageEnglish
AffiliationNRC Canadian Neutron Beam Centre; National Research Council Canada
NoteErratum published in volume 59, issue 10, page 4253, June 2011. DOI: 10.1016/j.actamat.2011.02.041
Peer reviewedYes
NPARC number18703290
Export citationExport as RIS
Report a correctionReport a correction
Record identifier042b0393-3081-494a-81e7-a68f3f1decad
Record created2011-11-10
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)