Over Max. Shear Rate

[Anonymous]

Hi All,

I know that if the shear rate is over the resin's maximum value, it will cause some problems, but what are the problems??
Thanks!!

Terry

[HugoHerrera7042]

excessive shear rate will always mean material degradation (material property loss), embrittlement (functional issues) and poor surface finish (appearance issues).

this degradation can be translated into a different kind of issues, such as: splay, discoloration, delamination and maybe burn marks as well (to mention only some of them).

you can find tons of info on the help menu about this topic...hope it helps!

[Anonymous]

Thanks, I will read the Moldflow help more detailed.

[madhukeshwart]

some material will be shear sensitive, they will result in degradation of required materials properties of
that material, breaks molecular chains , breaks fibres, reducion in L/d ratio of fibre, rise in temeprature , burn marks ,

and so on Edited by: madhukeshwart on Aug 3, 2009 5:26 PM

[Anonymous]

if insufficient mesh density be used (such as gate zone). sometimes the shear rate will be over predicted. Edited by: paulwang416 on Sep 1, 2009 10:10 AM