Joined: 26 Nov 2002 Location: Algae Colony On Mars
Posted: Thu Jun 09, 2005 4:18 pm Post subject:
The top one is of a stress-strain graph for a plastic of some sort. The horror bit is that stress and strain lose proportionality (OMG!). The third I still don't quite get, it seems to be saying that you can't have an enthalpy change of zero when doing latent heat. The final one is just randomly funny. _________________
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The top one is of a stress-strain graph for a plastic of some sort. The horror bit is that stress and strain lose proportionality (OMG!). The third I still don't quite get, it seems to be saying that you can't have an enthalpy change of zero when doing latent heat
It's not necessarily for a plastic. The plastic zone is where the proportionality is lost, it's called that regardless of material. The horror is that, for mechanical engineers, once something you've designed goes plastic, it's considered failed. Not such for civil engineering cases, they can often go plastic without trouble (except columns, which aren't even allowed to deflect).
Concerning the enthalpy thing, the enthaply change across a ipie is usually assumed 0. In reality it's not zero, so that's the mystery: where'd the enthalpy go/come from?
"Latent" means hidden, in this case it's not a reference to the phase change latent heats you're probably thinking of.
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