Editing existing materials

[avp081090]

Hello

I was wondering if it was "allowed" to change the thermal conduction of a material without changing other parameters. I found a wood material (Spruce, radial) in the Fraunhofer database but the thermal conduction is to low. Could i just copy this material and adjust the conductivity without changing diffusiion properties?

best regards

[Christian Bludau]

Generally spoken it is no problem to change the heat conduction of a material. But you have to make sure, that the other material parameters are still consistent. The higher conductivity can be due to a higher density which also can influence the diffusion properties.
Please also see the material softwood, maybe that fits better.
Christian

[fostertom]

An edit I would like to do: ordinary white EPS 0.04 vs graphited EPS 0.32. There seems none of the latter in the database but is now much used. It has same density and , I'd have thought, all other properties apart from addition of graphite powder. So would a simple change from 0.04 to 0.32 be reliable?

BTW, why is ordinary EPS so high (0.04). All UK data says 0.038, even after the more conservative test criteria imposed a few years ago. and graphited EPS is often 0.031. Is this PHPP-style pessimism applied to 'generic' products?

[Christian Bludau]

Hello Tom,

be careful by changing the thermal conductivity. If there is a table for the moisture depending conductivity (extended material functions) you have to change all values, not only the dry value in the basic values on the lift. I usually change the increase of conductivity for 0.032 proportional to the rise of the 0.04.

Christian

[fostertom]

Yes I thought I'd do it proportionally.