crack

Hello everybody,

I am searching precision of crack propogation in a bonded wafer double.I wrote a code but the problem is that when I want to solve it in ANSYS, the program is shutdown. I need help about it. Thanks for your helps...

 Greetings

 Volkan DALMISLI

P.S:The code is given below. 

finish
/title,sphere wafer
/filname,sphere wafer
/clear,start

*CFOPEN,volkan,dat           ! deletes the data file
*CFWRITE,releaserate     ! table heading of the data file
*CFCLOS
/PNUM, volu, 1 
/prep7

Hello Everybody

I´ve got problem with propagating the crack in two regions at the same time in Franc3d. I initialized the crack in one region and propagated it, but the crack is propagating only in one region, although the crack should be propagated also in second region. Can anyone help me, pleease? Which steps do I need to take to obtain the propagation in first and second region? It´s imposibble to initialize the same crack in two regions? 

Thanx 

When the dielectric constant of an insulator in an interconnect is reduced, mechanical properties are often compromised, giving rise to significant challenges in interconnect integration and reliability. Due to low adhesion of the dielectric an interfacial crack may occur during fabrication and testing. To understand the effect of interconnect structure, an interfacial fracture mechanics model has been analyzed for patterned films undergoing a typical thermal excursion during the integration process.

Zhen Zhang and Zhigang Suo

For a crack impinging upon a bimaterial interface at an angle, the singular stress field is a linear superposition of two modes, usually of unequal exponents, either a pair of complex conjugates, or two unequal real numbers. In the latter case, a stronger and a weaker singularity coexist (known as split singularities). We define a dimensionless parameter, called the local mode mixity, to characterize the proportion of the two modes at the length scale where the processes of fracture occur. We show that the weaker singularity can readily affect whether the crack will penetrate, or debond, the interface.