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请教那位高手做过压电材料问题。
本人欲用压电材料做sensor。模型是在一个板上粘一片拨薄的压电薄片。
板变形后,压电片会产生电压差。我用的材料是PZT8,这是我唯一查到
的材料。但是计算结果电压太大。请诸位高手指点。
命令流如下:
/COM, *** BUILD THE MODEL ***
!
/FILNAM,pl16 ! Jobname to use for all subsequent files
/TITLE,Piezoelectric plate natural frequency
/UNITS,SI ! Reminder that the international system (using mater)
! of units is used
/SHOW, ! Specify graphics driver for interactive run,
! for batch run plots are written to pl16.grph
/PREP7
!
ET,1,45 ! 8-node solid with all DOF, used for piezoceramic transducer
ET,2,5 ! 8-node solid with UX,UY,UZ DOF, used for aluminum beam
!
MP,EX,1,7.03E10 ! Modulus of Elasticity of aluminum
MP,NUXY,1,.345 ! Poisson's ratio of aluminum
MP,DENS,1,2690 ! Density of aluminum
MP,DENS,2,7600 ! Density of piezoceramic
MP,PERX,2,8.003E-9 ! Permittivity of piezoceramic
MP,PERY,2,8.003E-9
MP,PERZ,2,2.252E-9
TB,PIEZ,2 ! Piezoelectric "e" matrix of piezoceramic
TBDATA,3,-3.88
TBDATA,6,-3.88
TBDATA,9,13.91
TBDATA,14,10.34
TBDATA,16,10.34
TB,ANEL,2 ! Stiffness "c" matrix of piezoceramic
TBDATA,1,14.7E10,8.1E10,8.1E10
TBDATA,7,14.7E10,8.1E10
TBDATA,12,13.2E10
TBDATA,16,3.1E10
TBDATA,19,3.1E10
TBDATA,21,3.1E10
!
/VIEW,,1,-1,1
/VUP,,Z
L=500E-3 ! PLATE LENGTH
W=100E-3 ! PLATE WIDTH
T=8E-3 ! PLATE THICKNESS
X1=0.2
Y1=0.02
Y2=0.18
X2=0.4
TP=2E-3
LP=0.05
LW=0.05
BLOCK,,L,-W/2,W/2,-T/2,T/2 ! Defines covered beam volume
BLOCK,X1,X1+LP,-W/2,W/2,T/2,T/2+TP
BLOCK,X2,X2+LP,-W/2,W/2,T/2,T/2+TP
!mesh 我用gui做的,不会写,总之全是6面体,如果用“free”选项,则ansys给出四面体单元。
NSEL,S,LOC,Z,T/2
NSEL,R,LOC,X,X1,X1+LP
CP,1,VOLT,ALL
NSEL,ALL
NSEL,S,LOC,Z,T/2
NSEL,R,LOC,X,X2,X2+LP
CP,2,VOLT,ALL
NSEL,ALL
FINI
/SOLU
nsel,s,loc,x,0
d,all,ux,,,,,uy,uz
nsel,all
之后是在板的另一端加0。2牛的力。 我算出的电压有6000多伏。好象太大了吧。
此外,如果solid5我keyopt=0,则会出现非线形,经常不收敛。而keyopt=3,则不会,且算得很快。为什么?
email: ysd1020@hotmail.com
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