http://wiki.dtonline.org/index.php?action=history&feed=atom&title=Plasticity 2026-05-05T09:56:19Z Revision history for this page on the wiki MediaWiki 1.43.8 http://wiki.dtonline.org/index.php?title=Plasticity&diff=9141&oldid=prev 2017-03-21T11:30:18Z

<p>Created article</p> <p><b>New page</b></p><div>[[File:StressStrainGraph1.png|350px|right]]<br /> As material samples are stretched, initially, the &#039;&#039;&#039;[[Stress]]&#039;&#039;&#039; is directly proportional to the &#039;&#039;&#039;[[Strain]]&#039;&#039;&#039; - producing the straight line as shown on the graph. The material is behaving in much the same way as a spring would under tension and, if the force is removed, the material returns to its original length. The material is obeying [http://en.wikipedia.org/wiki/Hookes_law &#039;&#039;&#039;Hooke&#039;s Law&#039;&#039;&#039;] and this phase is known as the &#039;&#039;&#039;[[Elasticity|Elastic Stage]]&#039;&#039;&#039;.<br /> <br /> <br /> But if a force is continued to be applied beyond this phase, the material reaches a point at which it stays permanently stretched. This is the &#039;&#039;&#039;Yield Point&#039;&#039;&#039; or &#039;&#039;&#039;Elastic Limit&#039;&#039;&#039; and beyond this, during its [http://en.wikipedia.org/wiki/Plasticity_%28physics%29 &#039;&#039;&#039;Plastic Stage&#039;&#039;&#039;], the material will continue to remain permanently deformed until eventually it breaks.<br /> <br /> <br /> &#039;&#039;&#039;Plastic&#039;&#039;&#039; deformation occurs when the applying force is sufficient to break the [https://en.wikipedia.org/wiki/Metallic_bonding &#039;&#039;&#039;Inter-atomic Bonds&#039;&#039;&#039;], causing them to be rearranged as &#039;&#039;&#039;[[Crystalline_Structures#Dislocations|Dislocations]]&#039;&#039;&#039; move through the &#039;&#039;&#039;[[Crystalline Structures|Crystal Lattice]]&#039;&#039;&#039; and is therefore not reversed when the force is removed.<br /> <br /> [[Category:Terminology]]</div>

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