Issue 14

C.M. Sh

aranaprabhu et

alii, Frattura ed

Integrità Strutt

urale, 14 (2010)

27-35; DOI: 10

.3221/IGF-ESIS.

14.03

A C

nalysis ompact

of crack Tensil

-tip pla

stic zo (CTS)

ne in a Specim

e Shear

en

C. Dep Sh Res Dh s.k A B init pla by mi res wit

M. Sharan artment of M ashidhar K earch Center, arwad-58000 udari@rediffm STRACT . Th iation direc stic zone si analytical a xed mode (I ults are com h reference YWORDS . P

aprabhu echanical Eng . Kudari Department o 2, India ail.com e minimum tion under m ze (PZS). In nd the elast /II) loading pared to a to the loadi lastic zone; of crack ini iction of eng on the loadin 7] have prop ck-tip plastic nics (LEFM c zone radius crack initiate he loading d ence, this ki en estimated under mixed sing in their ode loading spect effectiv to validate th ck initiation M) regime fo N

ineering, Bap

uji Institute of

Engineering

& Technology

, Davanager

e 577004, In

dia

f Mechanical

Engineering S

DM, College

of Engineerin

g and Techno

logy,

criterions to heoretical c zones have ear (CTS) s the finite e n for crack

plastic zon ixed mode this invest ic finite ele according nalyze the m ng angle and Mixed mod

e radius (M loading. T igation, the ment comp to von Mise inimum p stress inten e I/II; Mini

PZR) criteri he MPZR t shape and s utations in s yield crite lastic zone sity factor. mum plastic

on is one of heory is bas ize of crack a Compact ria. The the radius (MPZ

the recent ed on the t -tip plastic Tensile Sh oretical and R) criterio

estimate cr omputation been estima pecimen un lement anal initiation an

ack s of ted der ysis gle

zone radiu

ent analysi

s.

s; Finite elem

K E

I N

TRODUCTIO

P

rediction life pred depends

tiation and o ineering mat g angle [4], osed fractur zone size in ) approach. (MPZR) th s in the dire irection. It is nd of study by numerica mode loadi investigation condition us e stress inte e finite elem angle with re r plane stres

rientation wi erials [1-3]. I and the loadi e criteria for mixed mod Recently, Bi eory for crac ction where well known needs detaile l method suc ng by the fin . Sharanapr ing finite ele nsity factor ent results wi ference to t s condition.

th its propag n mixed mo ng angle alter the predictio e fracture. Th an and Kim k initiation an the radius o that plastic d informatio h as the fini ite element m abhu and Ku ment analysi and is indep th the theore he loading an

ation path u de fracture, s the shape a n of the cra e analytical [4] and Kh gle in mixed f plastic zon zone size (P n about the te element m ethod, but t dari [10] ha s. The autho endent of lo tical results t gle and stre

nder mixed it is known t nd size of th ck-initiation estimates we an and Kh mode mono e takes eithe ZS) depend crack-tip pla ethod. Benr he details of ve studied si rs have dem ading angle. o analyze the ss intensity f

mode loading hat the crack e crack-tip pl angle based re obtained b raisheh [7] h tonic loadin r a local or s on the typ stic zone sha ahou et al . [9 the mixed m ze and shape onstrated th Hence, the minimum pl actor in linea

is desirable initiation a astic zone . Sev on the analy y Linear Ela ave propose g. MPZR the global minim e of the frac pe and size ] have estim ode plastic z of plastic z at MPZR va objective of astic zone ra r elastic frac

for ngle eral tical stic d a ory um ture in a ated one one ries the dius ture

inv esti Fra min stat dep spe frac the ana und line pre crit me

estigators [5 mates of cra cture Mecha imum plasti es that the ending on t cimen [8]. H ture specim plastic zone lysis are mis er mixed m arly with re sent work is erion for cra chanics (LEF

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