In the Solidworks Plastic materials database, the glass transition temps appear out (at least for HDPE). HDPE has a Tg of circa - 100 C, however the database shows common Tg's around +100 C - did someone forget to use the "-ve" sign or am I missing something?
Mark,
You make a good point.
You are correct in saying that "HDPE has a Tg of circa - 100 C, however the database shows common Tg's around +100 C". It is because SOLIDWORKS Plastic doe not differentiate between Tg and Tm(the melting temperature in its terminology. HDPE is a semi-crystalline material and as such it has a Tg and a Tm. The Tm value is the temperature to take into account in injection molding simulations. And the Tm value is around 100°C. Tm is labelled as Tg in SOLIDWORKS Simulation because there is no differentiation between amorphous and semi crystalline materials.
For more information, please see Solution Id: S-075193from the the SOLIDWORKS Knowledge Base.
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