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An experimental investigation was conducted to study the nature of dynamic rupture caused by shear loading, through impact, of interfaces which are held together by friction under external pressure. The dynamic stress field developed during rupture propagation was recorded in real time by a high-speed camera in conjunction with a classical dynamic photoelasticity set-up. Visual evidences of different dynamic propagating rupture modes were recorded. Unlike classical shear cracks in coherent interfaces of finite strength, rupture in frictional interfaces seems to grow without noticeable acceleration phases and at various discreet speeds. At low impact velocities a crack-like rupture mode occurs which becomes super-shear with the increase of the impact speed and a shear Mach cone emanates from the rupture point. For higher impact speeds super-shear and super-sonic Mach lines are observed formatting an unstable slip pulse which subsequently vanishes whereas evidences for extended stick and slip regions are recorded. Increasing the external applied pressure the observed features are intensified.
A Study on Second Mode Stress Intensity Factor (KII) of Cracked Plates Under Compression Load
Basrah Journal for Engineering Science
2012, Volume 12, Issue 2, Pages 54-65
2012, Volume 12, Issue 2, Pages 54-65
Abstract
Frictional Collection Crack Filler
A two-dimensional finite element method for analysis and determination of second modestress intensity factor (KII) of several crack configurations in plates under uniaxialcompression is presented in this study. Various cases including diagonal crack (i.e. cornercrack, central crack as well as at different locations on the diagonal) and central kinked crackare investigated with different crack's length, orientation and location. The influence of thecontact between two crack surfaces is taken into account by applying contact elementprocedure with desired friction coefficient. The stress intensity factor is calculated by a cracksurface displacement extrapolation technique. From the obtained results of the analysis it isfound that, the corner cracked plates more dangerous than the other cracked plates, since ithas the highest stress intensity factor. Also, the length and orientation of the kinked crackhave significant effects on the stress intensity factor. The results of this investigation isillustrated graphically, exposing some novel knowledge about the stress intensity factor andits dependence on crack configuration.