Talk:Plasticity (physics)

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untitled[edit]

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

Clays[edit]

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)[reply]

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)[reply]

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.

Effective stress[edit]

The current link out to effective stress doesn't seem appropriate given the current contents of the linked article. —DIV (128.250.80.15 (talk) 07:52, 9 January 2009 (UTC))[reply]

Contradicts other Wikipedia article[edit]

Clay - "Clay is a naturally occurring material composed primarily of fine-grained minerals, which show plasticity through a variable range of water content, and which can be hardened when dried and/or fired." —Preceding unsigned comment added by 69.116.236.218 (talk) 01:51, 24 March 2010 (UTC)[reply]

I've removed the contradictory examples from the intro in this article. Thanks for the heads up. Wizard191 (talk) 17:07, 30 March 2010 (UTC)[reply]

Merge from Creep (deformation)[edit]

These 2 articles appear to be both on the exact same topic and we don't need 2 articles that are so much the same. Blackbombchu (talk) 20:05, 9 March 2015 (UTC)[reply]

Creep is continued deformation at a constant load at a high temperature. Plasticity is the permanent deformation of a material at ever-increasing loads. They're two different physical phenomena and should not be merged. — Preceding unsigned comment added by 66.57.103.140 (talk) 14:45, 19 March 2015 (UTC)[reply]

Plasticity is the fundamental property and creep is a special case that varies with temperature. They are miles apart and deserve separate pages. — Preceding unsigned comment added by 213.131.175.194 (talk) 14:06, 6 May 2015 (UTC)[reply]