Issue 15

Int Int hea rati Val cat com En in F nor For val tha occ nor for Th val On 16( nor are dec wh geo erface Defects erface defect ting and the o G T /G Ic . V ues greater astrophically, ponent G v try Peak Heati ig. 15(a), an malized G T each locatio ues are plotte n the right ti urs at the sh malized G T ce. e individual m ues. This res -Orbit Cold . F a), and the c malized G T v a (for the lef rease and rea ere the left t metry; at Lo – Effect of D s were studie on-orbit col alues of G T than unity r or they co alues need to ng . For entry d friction alo values for tw n, the interf d as a functi p values for oulder of the for  = 0.4 i ode G valu ult suggests t (a) Interface (b) Normaliz Figure 15 or the on-o raze crack e alues as a fu t tip at Loca ch a plateau ip (towards cation 0, half efect Location d by assumi d condition w /G Ic less tha equire furthe uld mean th be calculated peak heatin ng the craze o values of t ace defect is on of the de all defect loc joggle, Loc ndicating tha es were also hat the defec defect at craze at varyin ed G T for  = : Normalized rbit cold con dges do not nction of th tions -1 and . Both the le the acreage) of the defec I. S. Raju et ng a constan ere conside n unity indic r study. Su e mode of and assesse g, the craze c crack edges i he coefficien centered be fect location ations consi ation 0. How t the craze c examined. t opening for crack Locatio g craze crack l 0. G T as a functi dition, the cr interact and e interface d 0). As the ft and right t has the high t is in the acr alii, Frattura ed t-length defe red. The res ate that the ch values co fracture is n d. rack surfaces nfluences the t of friction neath the cr . For  = 0 dered. For b ever, the no rack edge in For both  entry peak h n +1 and defo ocations (defo on of interface aze crack su do not influ efect location defect is mo ips have near er value. Th eage, and hal Integrità Struttu ct at differen ults for the n defect is sta uld mean t ot Mode-I come into c defect defo  for variou aze crack. B (Fig. 15(b)) , oth  = 0 a rmalized G T teraction is a = 0 and  = eating is dom rmed configu rmation scaled (c defect locatio rfaces displac ence the defe . The maxim ved into the ly the same n is difference f is down the rale, 15 (2011) t craze crac ormalized G ble and unlik he defect is dominated. ontact and sl rmations. Fi s locations o oth the left the left tip v nd  = 0.4, for  = 0 is n important 0.4, the G I inated by M rations for int by 20x). ) Normalized n – Entry pea e away from ct deformat um normal joggle regio ormalized G in behavior joggle curve 35-49; DOI: 10 k locations. T values are ely to grow unstable and Hence, the ide past each g. 15(b) and f the defect and right tip alues are con the maximum considerably variable to th values are lar ode I. erface defects G T for  =0.4. k heating. each other, ions. Fig. 16 ized G T occu n, the norm T values exce at Location . .3221/IGF-ESIS.1 Both entry p presented as catastrophic likely to g total indivi other, as sho 15(c) p resent along the jog normalized siderably sm normalized higher than e defect driv ger than the as shown in (b) presents rs in the acre alized G T va pt at Locatio 0 is due to 5.05 45 eak the ally. row dual wn the gle. G T aller G T the ing G II Fig. the age lues n 0, the