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湯圓喵銀蟲(chóng) (小有名氣)
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[交流]
計(jì)算出來(lái)的石墨烯彈性模量比理論值偏小 已有1人參與
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| 大家好,我使用velocity來(lái)拉伸石墨烯,然后根據(jù)應(yīng)力應(yīng)變曲線計(jì)算出來(lái)的彈性模量只有150GPa左右,請(qǐng)問(wèn)大家遇到過(guò)這種問(wèn)題嗎? |
新蟲(chóng) (小有名氣)
銀蟲(chóng) (小有名氣)
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你好!下面是我的腳本 # ------------------------ initialization ---------------------------- units metal boundary s s p atom_style full # ----------------- atom definition and force fields ----------------- read_data data.0429graphene pair_style airebo 3.0 pair_coeff * * ch.airebo c region upper block inf inf 77 inf inf inf units box region lower block inf inf inf -26 inf inf units box group upper region upper group lower region lower group boundary union lower upper group middle subtract all boundary variable yc equal ly variable l0 equal ${yc} variable strain equal "(ly - v_l0)/v_l0" variable strain1 equal "v_strain" variable stressz equal "-pyy/10000" # ----------------------------settings ------------------------------- timestep 0.001 thermo_style custom step time etotal pe ke temp lx ly lz press pxx pyy pzz density velocity middle create 298.15 53244 dist gaussian mom yes rot yes fix s1 boundary setforce 0 0 0 minimize 1.0e-10 1.0e-10 5000 10000 thermo 1 fix 222 all npt temp 298.15 298.15 1 z 0 0 0.1 dump 1 all atom 100 relax.g run 1000 unfix 222 undump 1 reset_timestep 0 velocity upper set 0.0 1 0.0 velocity middle ramp vy 0.0 1 y -26 77 sum yes fix 666 all nvt temp 298.15 298.15 0.001 thermo 1 thermo_modify lost ignore dump 888 all atom 100 tension.g run 150000 |
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