Issue 14

C.M

. Sharanaprabh

u et alii, Frattu

ra ed Integrità S

trutturale, 14 (2

010) 27-35; DO

I: 10.3221/IGF-E

SIS.14.03

par 284 thir has MP

ametric quad 4. The maxi d of yield st been consid a, Poisson’s

rilateral elem mum load ap ress to keep ered to be lin ratio (  ) of 0

ents conside plied is 10k the analysis d ear elastic ty .3 and elastic

ring plane str N and the co omain appro pe pertaining modulus ( E )

ess condition rresponding ximately und to interstitia of 197 GPa

. The numb applied stre er LEFM. I l free steel (IF [8].

er of element ss is 62 MPa n these calcu ) possessing

s used in the , which is ap lations, the m the yield stre

FE analysis proximately aterial beha ngth (  y ) of

was one vior 155

Figure 2 : S (all di

pecimen confi mensions in m

guration used m), thickness

in the analysis = 3 mm.

Figure 3 : Lo

ading Jig.

F

igure 4 : FE m

esh, loading a

nd boundary c

onditions used

in FE analysi

s.

R E

SULTS AND

DISCUSSIO

N

und the Th Sha Eq loa D

imen to estim he stress int g angles (  ) or various lo the stress in ment with th ve also been tress intensit ists some dis

study the pla K I and K II ) w he failure lo ndicates that that of mod and Kudari ited in the ab ig. 5 typically ensity factor

ifferen zone s compu

t load steps hape and siz ted for vari de loading i ed load, for ariation of K [13]. The ma ). The estima 0 kN. This p

were applied e ahead of th ous load step .e variation o a loading ang II vs. K I is in gnitudes of K ted theoretic lot indicates

to the spec e crack-tip. T s and loadin f K II vs. K I f le below 70° good agree I and K II ha al values of s that there ex

ate the stre ensity factors using the AB ading is depi tensity facto e results sho computed by y factors hav crepancy in t

ss intensity fa in mixed mo AQUS post cted in Fig.5. r in mode-I i wn by Benra analytical fo e been superi he estimation

ctor and to de loading ( processor. T This figure i s more than hou et al. [9] rmulations c mposed in F of stress int

stic ere cus for e-II. and ove for s by

er mixed mo similar appli is nature of v ranaprabhu ns. (6) and (7 d 4kN and 1

30