Problem regarding uniaxial tension test

Hi all,
I was just trying to do some uniaxial tension test by using fix_deform and as a specimen sample I took single crystal Al. I use the available lamps script at

But, surprisingly I do not see any fracture even after the strain value of over 200%. The sample is stretched unusually at that high strain. I have seen a recent post about this type of behaviour but do not see any comments over it.

Could anybody please make some suggestion what I’m missing.

Thanks for your help in advance.


# Input file for uniaxial tensile loading of single crystal aluminum
# Mark Tschopp, November 2010

# ------------------------ INITIALIZATION ----------------------------
units 		metal
dimension	3
boundary	p	p	p
atom_style	atomic
variable latparam equal 4.05

# ----------------------- ATOM DEFINITION ----------------------------
lattice		fcc ${latparam}
region		whole block 0 10 0 10 0 10
create_box	1 whole
lattice 	fcc ${latparam} orient x 1 0 0 orient y 0 1 0 orient z 0 0 1
create_atoms	1 region whole

# ------------------------ FORCE FIELDS ------------------------------
pair_style	eam/alloy
pair_coeff	* * Al99.eam.alloy Al

# ------------------------- SETTINGS ---------------------------------
compute csym all centro/atom fcc
compute peratom all pe/atom