Talk:Plasticity (physics)

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This page is very bad. The description of plasticity here is simplistic if not wrong. The fact that stress and strain are **tensors** is overlooked. I think it should in particular start with the plastic yield stress, so as to give some insights on how it works). I have added a couple of info myself, but the litterature on plasticity is enormous. Kachanov's book is a good start. Herve661

Hi, The article seems good ... up to a point as to me it seems a little biased towards metal. Can anyone expand it to include that most famous group of plastic materials: clays

Regards,

Andy

Be bold! It sounds like you know something about clays so why not contribute yourself. --cfp 19:40, 11 August 2006 (UTC)

In this case, boldness might not be rewarded...in the technical terms in which this article was written, clays are brittle materials that display no plasticity at room temperature. Just try making a permanent bend in an individual clay particle, or in a sintered piece of pottery! You'll need a very high-temperature forge, much hotter than would be needed to work titanium. A suspension of clay in water will deform permanently, but plasticity is a property of solids, not liquids.--Joel 06:00, 11 August 2007 (UTC)

Plastic deformation is a property of the material, not a property of the applied stress. Normal stresses can cause plastic behavior. The most common measure of static material properties is a tensile test.