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Topic: abaqus
i am doing a temp-disp analysis of three component 1-heater which i given body heat flux(130 w permm3) for 250 sec.
two tube which is concentric to heater,from heater to first tube i define surface radiation (approximate cavity )in which outer surface of heater and inner surface of first tube..with .85 emmisivity .and first outer and second inner siurface of tube i define surface radiation with .55 .and also i define gap conductance and contact( interaction property tangential ,normal,frictionalless ,hard ,and a surface to surface contact with small sliding ) between tubes.and outer surface of second tube a temp dependect convective h.t.one end is fixed and another end is free in x direction.the problem is that heat should be transfer from heater to first and second tube.so that it will ballom by plasticity and creep (which i define) and touch each other (outer surface of first tube and inner surface of second tube).. but this is not happendin because temp is not rising ..but when i am doing pure h.t. analysis with same model with same mesh and radiation ,gap etc i am getting the increased temp.
where is the probem
thanks in advace

by balbir Tue Aug 20 08:23:15 UTC 2013

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by ? Sun Nov 05 04:22:12 UTC 2017
 
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