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Why are Rocks that exhibit ductile strain were probably deformed?
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What is folding as it relates to the lithosphere?
Folding is the ductile deformation of rocks. This means that they change shape without fracturing. This can occur in some parts of the lithosphere if the conditions are correct (very low strain rates, high temperatures and/or high confining pressures).
What is the process by which the shape of a rock changes because of stress?
This is technically known as strain. If the change in shape occurs by fractures forming through the rock this is known as a brittle deformation. If however the rock deforms like a piece of clay being squashed this is known as ductile deformation.
A change in the shape of rock caused by a force placed on it?
erosion and it is quite similar to how sand was made because of the waves and all the earth's damage on it. Pretty simple if you think of it that way. a rock can erode if it is continuously pelted with water, wind, sand, rocks, etc. also a rock can change shape if it is melted and cools back down.
Are all minerals brittle?
This depends on the confining pressure, the temperature and the strain rate applied to the mineral. In general for minerals (and other materials), the lower the rate of strain, the more likely ductile or plastic creep deformation will occur. The higher the strain rate, the more likely brittle deformation is to occur. As the confining pressure increases, an objects shear strength will increase (this usually coincides with a greater depth of burial) and due to the earth's thermal gradient an increase in temperature. As the shear strength increases, brittle failure is less likely and the higher temperature means that plastic deformations or creep are more likely to occur.
What is transformed from rough strain bacteria to smooth strain cells?
DNA
What is a strain gage used for?
A strain gage is used to measure the strain, or local deformation, of an object. As the object deforms to stress, the gage also is deformed and its electrical resistance is changed. This change is then measured.
What are the Stress-strain characteristics of ductile materials?
initially there is the linear elastic region which obeys the hooks law :stress is directly proportional to the strain. at the end of the linear elastic region the ductile material reaches the yield point beyond which any change in dimensions become permanent. the material goes through a yield plateau in which stress is constant and the strain changes. after crossing the yield plateau the ductile material goes through the strain hardening region in which the deformation is permanent but as the region goes on the stress increases with the strain. here the strength of the ductile material increases as it is strain hardened. at a point it reaches the ultimate load point. This is the maximum load taken by the material. after which further deformation causes decrease in strength or the stress goes on decreasing finally breaking at the breaking load point. this region is called the post-ultimate region.
Is mild steel ductile at room teperature?
Yes, it is - it has a yield point and can strain quite a bit 20% or so before failure
What is volumetric strain?
Volumetric strain of a deformed body is defined as the ratio of the change in volume of the body to the deformation to its original volume. If V is the original volum and dV the change in volume occurred due to the deformation, the volumetric strain ev induced is given by ev =dV/V Consider a uniform rectangular bar of length l, breadth b and depth d as shown in figure. Its volume V is given by, This means that volumetric strain of a deformed body is the sum of the linear strains in three mutually perpendicular directions.
What are examples of elastic spring force?
If you stretch a rubber band then release it, it will return to its original shape. That is by definition elastic strain. Anything that returns to its original shape after being affected by force underwent elastic strain. If it is permanently deformed (ie you bent a paperclip out of place and it wont return to its original shape) then it passes the elastic strain region and suffered plastic strain.
What is strain hardening?
When ductile material is loaded, when stress reaches yield and if the load continues, as long as load is not high enough to break material, the material is strain hardened when returning to no load. That means its yield strength will be higher than before, and the material is stronger.
WHAT IS VOLUMETRIC?
Volumetric strain of a deformed body is defined as the ratio of the change in volume of the body to the deformation to its original volume. If V is the original volum and dV the change in volume occurred due to the deformation, the volumetric strain ev induced is given by ev =dV/V Consider a uniform rectangular bar of length l, breadth b and depth d as shown in figure. Its volume V is given by, This means that volumetric strain of a deformed body is the sum of the linear strains in three mutually perpendicular directions.
Why the yield point occur in the stress-strain graph of mild steel?
Once material is stressed. dislocations present in it starts to move and gather near grain boundary. These dislocation are repulsive in nature and resist further movement, hence yield point occurs. Once dislocations crosses the grain boundary, there is very less amount of force required to keep them moving, hence yield point phenomenon appears i.e. less amount of force is required.
Draw stress strain curve for mild steel?
Mild steel usually contains predominantly of Ferrite structure and it has got good ductility. The difference in stress-strain curve of Mild steel to other ductile materials is that it undergoes Multiple yielding. it occurs due to the fact that C and N segregate to dislocations.
What is strain back effect in shaping machine?
During shaping operation, the cutting tool exerts a force on the workpiece. This force can be resolved in two components(horizontal,vertical). Horizontal force is the cutting force. Vertical force causes the workpiece material to deform elastically. We know, an elastically deformed body regains its original shape after the force is removed. So, after the tool move past one elastically deformed section of the workpiece, the section is raised up as the force is removed from the section. This effect is called "Strain back effect".
Why eyes turned red after long work?
This is because of strain on eyes. Strain is probably because of concentration. And so more blood passes from veins and they look red.
What is the difference between brittle and ductile with two examples of each?
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.
