Issue 14

wh spe M I Wh foll wh sin exp Th F IN sho Bo 90° loa is a bel A s geo Th et a I T ere p is the a cimen and  NIMUM PLA t is assume radius evalu r           ere r is the r owing form. ( xx   ere  y is the y gular stress f ressed in the  , I r K I K K  e crack initiat ITE ELEM he gene specime referred wn in Fig.2, rrego et al. [1 (pure Mode ding jig [10] a scertained b ow, in the sim  1 F F 2 F F   3 F F eries of elast metry due to e loading and l . [12] and ar pplied force, is the loadin STIC ZONE d in this stud ated from th 0 o    adius of plas 2 ) ( yy yy    ield stress in ield of equa following fo  1 , 4 II K    52 sin 2 16 II     ion angle is g ENT ANALY ral-purpose f n [10] under to as the C the dimensi 2]. The loadi –I) to study long the six y applying u ilar manner     cos 2 1 6 F  sin 5 F      cos 2 1 4 F ic finite elem the lack of l displacemen e clearly sho C.M. Sh b is the crack g angle. RADIUS CR y that the di e von Mises 2 2 r        tic zone. Th 2 ) ( zz    uniaxial tens tions 1 to 3 rm.  2 2 3 1 4 I y K       6 sin 3 16   iven by Eq. SIS inite elemen mixed mode ompact Mixe ons of the s ng of the sp the plastic d holes as show niaxial point to that demo    sin b c    sin b c ent calculatio oading symm t boundary c wn i n Fig.4. aranaprabhu et depth of th ITERION rection of cr yield criterio 0 o       e von Mises 2 ) zz xx     ion. As an ap in the abov  cos 2    2sin      8, t he relative t (FE) code loading has d Mode (CM pecimen con ecimen is app eformation ah n in Fig. 3. I loads F 1 to nstrated by R       ns have bee etry. A typic onditions us Two-dimens alii, Frattura ed e specimen, ack initiation n. The crack yield criteria 2 2 6( xy yz    proximate d e yield criter 2 2cos 2     minimum m ABAQUS is been conside M) specime sidered in th lied at variou ead of the c n the presen F 6 as shown ichard [11]. n made on th al two-dimen ed in this ana ional elastic F Integrità Strutt w is the width coincides w initiation can for the three 2 ) 2 zx     etermination ion and solv 2 15 2 4 II K     ust have pos used in thi red in the pr n [4]. The s e analysis ar s angles (  ), rack-tip. The t FE analysis in th e Fig. e CTS speci sional FE m lysis are simi E calculatio urale, 14 (2010) of the spec ith the direct be determin dimensiona 2 y of the plasti e for the pla 2 9 sin 2 4   itive circumf s study. A C esent study. pecimen geo e similar to 0° (pure Mo load is appli the specimen 4 a nd estima men (Fig. 2) esh used in t lar to the one ns were perf 27-35; DOI: 10 imen, t is the ion of minim ed by minimi l object can c zone, one c stic zone ra cos 2     erential stres ompact Ten This kind of metry used i the one used de-II), 18°, 3 ed at various loading at v ted by Eqns considering t he analysis is used in the ormed using .3221/IGF-ESIS. thickness of um plastic z zing r [4]: (8) be written in (9) an substitute dius r . It can (10) s. sile Shear (C specimen is n the analys in the work 6°, 54°, 72° angles  usin arious angles . 11-13 a s gi (11) (12) (13) he full specim shown in Fi work of Borr eight noded 14.03 29 the one the the be TS) also is is of and g a (  ) ven en g. 4. ego iso-