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zhangjiongl

新虫 (初入文坛)

[求助] 拉伸应力应变曲线怎么里面还有负的

照着手册上有个改的, in 文件
boundary    p p p
units        metal
atom_style    atomic
read_data data.pi
neighbor    2.0 bin
neigh_modify    delay 1 check yes

# LJ potentials
pair_style    eam
pair_coeff    * * Cu_u3.eam
# ------------------------- SETTINGS ---------------------------------
compute csym all centro/atom fcc
compute peratom all pe/atom
######################################
# EQUILIBRATION
reset_timestep 0
timestep 0.001
velocity all create 300 12345 mom yes rot no
fix 1 all npt temp 300 300 1 iso 0 0 1 drag 1
# Set thermo output
thermo 1000
thermo_style custom step lx ly lz press pxx pyy pzz pe temp
# Run for at least 10 picosecond (assuming 1 fs timestep)
run 20000
unfix 1
# Store final cell length for strain calculations
variable tmp equal "lx"
variable L0 equal ${tmp}
print "Initial Length, L0: ${L0}"
######################################
# DEFORMATION
reset_timestep 0
fix  1 all npt temp 300 300 1 y 0 0 1 z 0 0 1 drag 1
variable srate equal 1.0e10
variable srate1 equal "v_srate / 1.0e12"
fix  2 all deform 1 x erate ${srate1} units box remap x
# Output strain and stress info to file
# for units metal, pressure is in [bars] = 100 [kPa] = 1/10000 [GPa]
# p2, p3, p4 are in GPa
variable strain equal "(lx - v_L0)/v_L0"
variable p1 equal "v_strain"
variable p2 equal "-pxx/10000"
variable p3 equal "-pyy/10000"
variable p4 equal "-pzz/10000"
fix def1 all print 100 "${p1} ${p2} ${p3} ${p4}" file Al_SC_100.def1.txt screen no
# Use cfg for AtomEye
dump   1 all cfg 250 dump.tensile_*.cfg id type xs ys zs c_csym c_peratom fx fy fz
dump_modify 1 element Al
# Display thermo
thermo  1000
#thermo_style custom step v_strain temp v_pxx v_pyy v_pzz ke pe press
thermo_style custom step v_strain temp v_p2 v_p3 v_p4 ke pe press
run  20000
data 文件在附件
stress-strain.jpg
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  • 附件 1 : data.pi
  • 2013-03-24 12:30:47, 5.3 K

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ddll_slsl

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【答案】应助回帖

感谢参与,应助指数 +1
你的应力是怎么计算的? 另外, 你的模型视图是怎样的?
2楼2013-03-25 14:40:55
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