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crack propagation using XFEM

Submitted by Sarah A. Eassa on

hi everyone my name is sarah

i am new to abaqus.i wonder if anyone can help me. i made a crack propagation model in 2D.unfortunately the crack wasn`t propagated. Only there was a separation between the two surfaces where the crack line is in between. How can i make the crack tip propagates through the line drawn?

thanks

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Fracture Mechanics Forum
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Sarah A. Eassa

thanks alot Simorgh

i know this link . I did what it says. but there are warnings that say the degree of freedoms are not enough. how come ? i am using xfem where the  numbers of DOFs are  bigger than it should be!! Shall i build my own uel subroutine to overcome this problem?

Sun, 04/15/2012 - 21:56 Permalink
Dipak Rakshit

Dear All,



I am a M.Tech Student doing research on Fracture Mechanics of Fibre Reinforced Composites using XFEM in ABAQUS.



To
achieve the goal, I started from Crack Initiation and Propagation for
isotropic material in ABAQUS using XFEM following this manual

http://www.scribd.com/doc/102150619/Frac-l09-Xfem.



It has two case:



1. Crack initiation and propagation

2. Propagation of an existing Crack.



For the first case, Maximum principle stress criterion has been used
and maximum principle stress has been set as 22e6. In result, in the
crack tip stress become about twice this maximum stress.But,  no crack
has been initiated.







I am begging for your kind attention to help me in this regard.



Waiting for your kind advice,



Thanks & regards,

Dipak Rakshit

Mon, 09/24/2012 - 16:45 Permalink