Issue 15

I. S 44 def i.e. Alt the crit wh driv the wh mo 14. rati For in F test crit to mo Sin G II bas R E I . Raju et alii, Fr ect growth (i , G T /G Ic ≥ 1. ernately, a m two-dimens erion. This B T  R G ere G T repre ing force. T resistance R GR  ere G Ic and G de-mixity rat When the r o equals or e a mixed-mo ig. 14. This ing. For a v erion. Mixed fit mixed-mo de-mixity rat gle cantilever c . In the abs is fracture to SULTS AND n this secti the on-orb analyses an attura ed Integri .e., defect is ixed-mode fr ional plane-s -K criterion 1 sents the tot he resistanc is given by  II I c c G   IIc represent io, and m rep atio of G T to xceeds unity, de response, exponent is alue of m =1, -mode fract de fracture d ios less than beam and e ence of furth ughness valu D ISCUSSIO on, only repr it cold cond d results can G tà Strutturale, 1 likely to grow acture criteri train criterio is expressed al defect dri e R is also re  T II I m c G G G       the Mode I resents the e R is less tha the defect is Figure the B-K resi typically det a linear respo ure tests of p ata accurately  , the respon nd-notch fle er test data, es are used in N esentative re ition are pre be found i n 0 c G Ic G IIc ~ Line 5 (2011) 35-49 in a catast on is used to n given by B as ving force, g ferred to as  I c G G   and Mode II xponent of  n unity, the said to be un 14 : Typical cu stance R give ermined usin nse like the olymeric mat . A typical m se is domina xure test con a value of tw evaluatin g E sults in term sented. Bo Ref. 1-6. G I 0.2 Mode ar m=1 curve fit ; DOI: 10.3221/I rophic mann determine w enzeggagh iven in Eq. G c , the critica  I II c c G   material tou used to fit th defect is said stable, and c rve fit of mixe n i n Eq. 4 is g a curve fit green dashed rix composit ixed-mode ted by Mode figurations w o was select q. 4 as they s of defect d th interface I /G T I dominated GF-ESIS.15.05 er) may occu hether the d and Kenane 2, and R rep l fracture tou m ghness value e mixed-mo to be stable atastrophic d d-mode fractu dependent o for mixed-m line in Fig. 1 es show that fracture crite I behavior. ere used in ed as the valu provide a sm riving forces, and substrat 1  Mixed mode dominated Deter to mix r when G T is efect is stab [11] is used resents the ghness base s, respectivel de test data a , and defect g efect growth re data. n the value o ode fracture 4 is obtained the B-K crit rion curve is RCC fracture e of the exp aller value fo the G T value e defects are mined as a curve f ed-mode data, m> greater than le or unstabl as the mixe resistance to d on test dat y,  = G II /G s shown syst rowth is unl is likely. f the expone data obtain , which is a n erion using m shown as red testing to d onent m . In r R , which is s, for entry p considered it 1 or equal to e. In this pa d-mode frac (3) the total de a. The value (4) T represents ematically in ikely. When nt m as indic ed from mat on-conserva =2 or 3 app i n Fig. 14. etermine G Ic addition, th conservative eak heating . More deta G Ic ; per, ture fect for the Fig. the ated erial tive ears For and e B- . and iled