【讨论】热接触分析没有通过接触面来传导？

stevenfeng2003

两块物体接触（如图），接触对建立了，TCC是接触热阻，施加了温度，
但是可以看到两块物体之间的传导没发生，（因为接触面之间的温度差别太大了）， 如何来调整呢？
我参考的是VM23的例子。/prep7
Antype,0
mp,prxy,,0.3
/title, FENXI  
!thopt,quasi
  
!eqslv,jcg
  
et, 1,solid5
et,2,targe170
et,3,conta174
KEYOPT,3,1,1
KEYOPT,3,12,5
  
mp,ex,1,2e10         
  
MP,KXX,1,75              ! CONDUCTIVITY
MP,ALPX,1,12E-6          ! THERMAL EXPANSION COEFFICIENT
MP,MU,1,0.3  
  
!mp,nuxy,1,0.30  
R,2,,,,0.01 ,,   
RMORE,,,,, ,
RMORE,,5.28e-4,,, 0,      !TCC=5.28e-4
RMORE,,,,, ,
  
R,3,,,,0.01 ,,   
RMORE,,,,, ,
RMORE,,5.28e-4,,, 0,
RMORE,,,,, ,
  
R,4,,,,0.01 ,,   
RMORE,,,,, ,
RMORE,,5.28e-4,,, 0,
RMORE,,,,, ,
  
x=0
y=0
  
k,1,0,0  
k,2,10,0
k,3,10,10   
k,4,24,10   
k,5,24,45   
k,6,0,45
k,7,24,18   
k,8,24,22   
local,11,1,24,20,,90
l,7,8   
   
csys,0   
l,1,2
l,2,3   
l,3,4   
l,4,7   
l,8,5   
l,5,6   
l,6,1   
!SAVE
LFILLT,3,4,2, ,  
LFILLT,4,5,1, ,  
LFILLT,3,2,1, ,  
lsel,s,line,,all
al,all
  
k,15,0,-4
k,16,10+x,-2
k,17,10+x,10-y
k,18,26+x,10-y
k,19,26+x,20
k,20,24+x,22
k,21,24+x,45
k,22,54+x,45
k,23,54+x,20
k,24,14,-14
k,25,0,-14
local,12,1,24+x,20,,-90
  
l,19,20
csys,0
l,15,16
l,16,17
l,17,18
l,18,19
l,20,21
l,21,22
l,22,23
l,23,24
l,24,25
l,25,15
  
LFILLT,13,14,2, ,  
LFILLT,14,15,2, ,  
  
lsel,s,line,,12,24,1
al,all
ALLSEL,ALL  
  
esize,2,0
type,1
    !rotate area into volume by axil
  
asel,s,area,,1,2,1
  
VROTAT,all,,,,,,25,6,30, ,
  
  !control the work plane space
WPSTYLE,,,,,,,,1
wpstyle,0.1,0.1,-50,50,0.003,0,0,,5
  
wpro,,90.000000
  
!substrct volume for meshing easily
CYL4, , ,4, , , ,80  
VGEN, ,3, , , ,60, , , ,1  
  
vsel,s,,,1
vsel,a,,,2
vsel,a,,,3
vsbv,all,3   
allsel
  
wpof,,,-10.000000
bopt,numb,off
   ! DIVIDE THE VOLUME BY WORK PLANE
VSBW,       4   
vsbw,       5
/PNUM,VOLU,1
wpof,,,-8.000000
VSBW,       2
wpof,,,-4.000000
VSBW,      5   
VSBW,      3
/REPLOT
wpof,,,24
vsbw,     4
  
VSWEEP,all       ! mesh all volumes
/view,1,1,1,1
/REPLOT
WPSTYLE,,,,,,,,0
allsel
  
mat,3
real,2
   ! Generate the target1 surface
asel,s,,,8
cm,target1,area
type,2
nsla,s,1
esln,s,0
esurf,all
   ! Generate the contact1 surface
asel,s,,,22
cm,contact1,area
type,3
nsla,s,1,
esln,s,0
esurf,all
allsel
  
mat,3
real,3
   ! Generate the target2 surface
asel,s,,,10
cm,target1,area
type,2
nsla,s,1
esln,s,0
esurf,all
   ! Generate the contact2 surface
asel,s,,,24
cm,contact1,area
type,3
nsla,s,1,
esln,s,0
esurf,all
allsel
  
mat,3
real,4
   ! Generate the target3 surface
asel,s,,,4
cm,target1,area
type,2
nsla,s,1
esln,s,0
esurf,all
   ! Generate the contact3 surface
asel,s,,,15
cm,contact1,area
type,3
nsla,s,1,
esln,s,0
esurf,all
allsel
  
/solu
asel,s,,,31      ! area of  top bottom  
asel,a,,,16
nsla,s,1
d,all,temp,100
allsel
   !area of bottom touch the rock
asel,s,,,26
asel,a,,,54
asel,a,,,17
asel,a,,,36
nsla,s,1
d,all,temp,160
allsel
  
asel,s,,,48,49,1
nsla,s,1
d,all,temp,140
allsel
             ! area of inside  
asel,s,,,38
asel,a,,,2
asel,a,,,41,47,3
nsla,s,1
d,all,temp,60
allsel
  
/solu
solve

stevenfeng2003

根本做不出来吗？

www10194

TCC那么小，热能传导么？

zhangyp

钢-钢接触
一般压力大时TCC=1~3e4W/(m^2*K）
压力小时TCC=0.5~2e3W/(m^2*K）

xiaoan

TCC小，意味换热微弱，那么温差就大；反之，换热强烈，温差小。你不应对此感到奇怪。
接触的存在对换热肯定起阻碍作用，要不怎么叫接触热阻呢？

iomega

I would suggest you to first understand what is thermal contact resistance and their typical values.  Otherwise the simulation will be "Garbage In and Garbage Out".

To give a example:

Assume thermal conductivity of air is 0.02 W/m-K.
Then the thermal resistance of 1 mm air gap is: 1mm/ 0.02 =  0.05 m^2-K/W.
Correspondingly the thermal conductance of 1 mm air gap is 20 W/m^2-K.

You example uses TCC=5.28e-4  -> thermal contact conductane =5.28e-4 W/m^2-K  

This is equivalent to 37.9m air gap between the adjacent components. No wonder you will see no temperature rise in one the object.

两块物体接触（如图），接触对建立了，TCC是接触热阻，施加了温度，
但是可以看到两块物体之间的传导没发生，（因为接触面之间的温度差别太大了）， 如何来调整呢？
我参考的是VM23的例子。/prep7
Antype,0
  ...
stevenfeng2003 发表于 2004-3-13 18:42