由于做MEMS的,想把原先建的模型的米单位改成微米单位制的。。输出结果出现差别较大。谁帮我看看我的压电材料的系数变换的对不对,不知道
1.米单位的输入
/prep7
mp,dens,1,7500
mp,perx,1,1700 ! permittivitity
mp,pery,1,1700
mp,perz,1,1470
tb,ANEL,1 ! stiffness C, N/m^2
tbdata,1,12.6E10,7.95E10,8.41E10 ! c11,c12,c13
tbdata,7,12.6E10,8.41E10 ! c11,c33
tbdata,12,11.7E10 ! c33
tbdata,16,2.30E10
tbdata,19,2.30E10
tbdata,21,2.35E10
tb,PIEZ,1 ! PIEZ constant, C/m^2
tbdata,3,-6.5 ! e31
tbdata,6,-6.5 ! e31
tbdata,9,23.3 ! e33
tbdata,11,17.0 ! e15
tbdata,13,17.0 ! e15
!/define main beam material properties
mp,dens,2,7800
mp,EX,2,209e9
mp,nuxy,2,0.3
2.微米单位制
/prep7
mp,dens,7.5e-15
mp,perx,1,1.7e9 ! permittivity
mp,pery,1,1.7e9
mp,perz,1,1.47e9
tb,ANEL,1 ! stiffness C, UN/um^2
tbdata,1,12.6E4,7.95E4,8.41E4 ! c11,c12,c13
tbdata,7,12.6E4,8.41E4 ! c11,c33
tbdata,12,11.7E4 ! c33
tbdata,16,2.30E4
tbdata,19,2.30E4
tbdata,21,2.35E4
tb,PIEZ,1 ! PIEZ constant, pC/um^2
tbdata,3,-6.5 ! e31
tbdata,6,-6.5 ! e31
tbdata,9,23.3 ! e33
tbdata,11,17.0 ! e15
tbdata,13,17.0 ! e15
!/define main beam material properties
mp,dens,2,7.8e-15
mp,EX,2,209e3
mp,nuxy,2,0.3
做压电悬臂梁的,再改成微米后,电压变化较大。。不知道是不是压电材料的系数变换的有问题 |