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18717718552

新虫 (小有名气)

[求助] 分子动力学纳米压痕模拟数据处理问题 已有1人参与

这是我用来做纳米压痕的in文件 运行没有问题 但是数据处理的时候发现 位移增大 载荷反而减小 大神们帮忙看下是什么原因
echo both
#creates matrix
units metal
boundary p p s
atom_style atomic
dimension 3
read_data 550ns0.1v823k.data1
mass 1 55.845
mass 2 63.546
mass 3 58.6934
timestep 0.002
pair_style eam/alloy
pair_coeff * * FeCuNi.eam.alloy Fe Cu Ni
#Energy minimization
minimize 1.0e-3 1.0e-6 1000 1000
#define groups
region reg block INF INF INF INF INF INF units box
group reg region reg
region reg1 block 9 90.282 9 90.282 9 50 units box
group reg1 region reg1
region newton_layer block 20 79.282 20 79.282 20 100.282 units box
group newton_layer region newton_layer
group thermostat_layer subtract reg1 newton_layer
group boundary_layer subtract reg reg1
dump 1 all atom 1000 dump123.lammpstrj
log log123.data
#intial velocities
compute newtemp thermostat_layer temp
velocity thermostat_layer create 300 8728007 temp newtemp
#fix
fix 1 boundary_layer setforce 0.0 0.0 0.0 #固定边界层
fix 2 thermostat_layer nvt temp 300.0 300.0 0.05 # 恒温层温度设置
#assigning velocity to the indenter in z direction loading
variable z equal "101.282-step*dt*0.05" #0.05 loading rate
print "z is $z"
#indenter position and radius at onset of loading
fix 3 newton_layer indent 1000.0 sphere 50 50 v_z 30.0 units box
thermo 100
thermo_style custom step temp c_newtemp f_3[1] f_3[2] f_3[3]
run 80000
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新虫 (小有名气)

【答案】应助回帖

你这个起始的z定义是不是少算了压头的半径
2楼2020-06-13 21:20:47
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