Brittle Fracture
AimsBefore you startIntroductionWhen do atomic bonds break?Why do cracks weaken a material?Inglis and the crack tip stress ideaCan we calculate the energy changes?What about tension?Another way of expressing the energiesAnother way of calculating the energiesWhy bother if they are the same?Coping with a scatter in strengthWhen does the sample fail completely?Sub-critical crack growth and R-curvesSummaryQuestionsGoing furtherTLP creditsTLP contentsShow all contentViewing and downloading resourcesAbout the TLPsTerms of useFeedbackCredits Print this page

PreviousNext

# Finite Element simulation of a sharp crack

A Finite Element simulation was carried out on the same loading setup as the polycarbonate studied previously. A sharp crack was used, i.e. an infinitely small crack tip radius.

The stress perpendicular to the crack plane, σ_{11}, decreases with distance from the crack tip:

This curve can be fitted closely to a r^{−1/2} curve, showing that our prediction for the stresses ahead of a crack tip is accurate.