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when the reactive force is less as compared to the applied force on the body then a deformation occurs in the body.
Generally something that is brittle will not deform, or deform very little before it breaks, where as something that is ductile will deform a lot before it breaks. That is how it is when comparing steels. White cast iron has no ductility therefore it will break with little or no deformation, where as mild steel has higher ductility and will deform considerably before it breaks.
Friction occurs when two material bodies in contact slide past one another.
In case of elastic deformation when the applyed stress disappears, the material returns in its initial form. In case of plastic deformation a remaining shape change occurs. Until a stress value - what is property of individual material - called flow stress, the material deforms elastically, afterwards plastically. You can find information about it for example in the following page: http://www.virginia.edu/bohr/mse209/chapter6.htm ## Please somebody correct my awful english, thanx ##
Nothing "happens". This occurs all the time.
Up to a point, it is possible to elastically deform any material. If the force is released, the material relaxes back to its original shape. If a material is deformed too much, the deformation becomes permanent (plastic deformation) or fracture will occur in a non-ductile material such as glass.
If by plastic you mean a material made from plastic as opposed to plastic deformation of say steel for example, then yes, they are synthetic.
Yes
Yield strength is the stress at which a specified amount of permanent deformation of a material occurs. When we apply stress to a material, it deforms. Some of the deformation is plastic and the material can recover when the stress is relieved. But some deformation is permanent and the material cannot recover from it. As we apply more stress, there is more deformation. This plots on a curve in a somewhat linear, or proportional, way. But at some point, a bit more stress results in a lot more deformation, and this is the proportional limit of the material. Stress applied beyond this causes an increasing rate of deformation until the maximum or ultimate strength of the material is reached. (Beyond that it will fail completely.) Somewhere between the proportional limit and the ultimate strength of the material is the yield strength. The yield strength of a material cannot be calculated for any material. It must be arrived at through (repeated) experiment and statistical analysis. Use the link below to the related question, and the other links to related articles that explain more about yield strength.
Elastic deformation occurs when an opposing force is applied to the drug after particle rearrangement (i.e. the initial repacking of the particles). If the force is released before the yield point is reached, the particles of the drug will return to their original shape. However, if the force goes beyond the yield point, the powder will undergo plastic deformation or brittle fracture.
Ductile deformation is when rock is given enough stress to break. If the stress is less, it will bend but not break.
1) zero stress on elastic material/it's at original position 2) stress is applied/deformation occurs 3) release of energy (earthquake) 4) elastic material rebounds
is deformation
when the reactive force is less as compared to the applied force on the body then a deformation occurs in the body.
deformation
When rusting occurs the mass of the substance increases since the rusting material reacts with the oxygen in air
Generally something that is brittle will not deform, or deform very little before it breaks, where as something that is ductile will deform a lot before it breaks. That is how it is when comparing steels. White cast iron has no ductility therefore it will break with little or no deformation, where as mild steel has higher ductility and will deform considerably before it breaks.