×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Combined raditaion and convective heat transfer analysis in Abaqus

Combined raditaion and convective heat transfer analysis in Abaqus

Combined raditaion and convective heat transfer analysis in Abaqus

(OP)
Dear all
I would like to give combined radiation and convective heat transfer coefficient for the thermal analysis of the welding process in Abaqus. How can I give the same?

The equation to be used for predicting the same is

h=0.00668T when T<<500oC
0.231T-82.1 when t>>500oC

Paper ref:3D finite element simulation of temperature distribution, residual stress and
distortion on 304 stainless steel plates using GTA welding,D. Venkatkumar* and D. Ravindran

RE: Combined raditaion and convective heat transfer analysis in Abaqus

To define temperature-dependent convection you have to first use Create Interaction Property —> Film condition. Check the box „Use temperature-dependent data” and specify the values. Then use Create Interaction —> Surface film condition. Select surfaces and in the Edit Interaction window change the Definition from Embedded Coefficient to Property Reference. Select previosuly created interaction property (if it’s not added automatically).

Radiation is normally defined in Abaqus by providing the value of emissivity (no option for temperature dependence unless you use cavity radiation). But if you want to account for it indirectly, by adding its contribution to heat transfer coefficient then you have to follow the procedure described in the first paragraph.

Another option would be to write user subroutine but this won’t be so easy.

RE: Combined raditaion and convective heat transfer analysis in Abaqus

(OP)
Thank you

I am attaching the heat flux calculation I have done to give as DFLUX input in Abaqus subroutine.But the temperature is found to be high after giving this heat flux values in the subroutine. As per the article maximum temperature was found to be 1600 degree Celcius. Can anyone please correct me if there is any mistake?

SUBROUTINE DFLUX(FLUX,SOL,KSTEP,KINC,TIME,NOEL,NPT,COORDS,
1 JLTYP,TEMP,PRESS,SNAME)
INCLUDE 'ABA_PARAM.INC'
DIMENSION FLUX(2),TIME(2),COORDS(3)
CHARACTER*80 SNAME
REAL t,x,y,z,Q,cf,cr,b,a,Amp,volt,n
REAL z1,x2,y2,z2,v,ff,fr,d1,d2,l
REAL FLUX1

t = time(2)

c welding arc
cf =.003
cr =.006
b = .001
a = .00305


c speed of welding in the Z direction
v=.0024
z1 = v*t
c coordinate
x = COORDS(1)
y = COORDS(2)
z = COORDS(3)

c
x2=x
y2=y
z2=z-z1
c
Qf=1763600000000
Qr=146900000000
if(JLTYP.EQ.1) then
if(KSTEP.EQ.1) then
c Goldak's volumetric heat source model
if(z2<=0) then
FLUX(1)=Qr*exp(-((x2)**2/a**2+(y2)**2/b**2+(z2)**2/cr**2))


else if (z2>0) then
FLUX(1)=Qf*exp(-((x2)**2/a**2+(y2)**2/b**2+(z2)**2/cf**2))


end if
end if
end if

return
end

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

White Paper - The Criticality of the E/E Architecture
Modern vehicles are highly sophisticated systems incorporating electrical, electronic, software and mechanical components. Mechanical systems are giving way to advanced software and electronic devices, driving automakers to innovate and differentiate their vehicles via the electric and electronic (E/E) architecture. As the pace of change accelerates, automotive companies need to evolve their development processes to deliver and maximize the value of these architectures. Download Now
White Paper - Model Based Engineering for Wire Harness Manufacturing
Modern cars, trucks, and other vehicles feature an ever-increasing number of sophisticated electrical and electronic features, placing a larger burden on the wiring harness that enables these new features. As complexity rises, current harness manufacturing methods are struggling to keep pace due to manual data exchanges and the inability to capture tribal knowledge. A model-based wire harness manufacturing engineering flow automates data exchange and captures tribal knowledge through design rules to help harness manufacturers improve harness quality and boost efficiency. Download Now
White Paper - Modeling and Optimizing Wire Harness Costs for Variation Complexity
This paper will focus on the quantification of the complexity related costs in harness variations in order to model them, allowing automated algorithms to optimize for these costs. A number of real world examples will be provided as well. Since no two businesses are alike, it is the aim of this paper to provide the foundational knowledge and methodology so the reader can assess their own business to model how variation complexity costs affect their business. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close