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Stress and strain
The document defines stress and strain in rocks. It explains that stress can be compressive, tensional, or shear as a result of plates moving or pressing against each other. Strain is the adjustment rocks undergo due to stress, which can result in changes to volume, shape, or fracturing. There are three types of strain: elastic, where rocks return to their original shape after stress; plastic, where rocks are permanently deformed after stress; and fracture, where rocks break or crack.
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Stress and strain
- 1. Presented by: RobbieLiza E. Caytiles
- 2. Stress a force thattends to compress, pull apart or distort a rock
- 3. A. Compressive Stress -Resultsfrom the movement of two pressing plates pressing on a stationary plate. (Image courtesy of Michael Kimberly, North Carolina State Univ.)
- 4. B. Tensional Stress -Theeffect of one part of plate moving away from fixed plate. (Image courtesy of Michael Kimberly, North Carolina State Univ.)
- 5. C. Shear Stress -Resultsfrom one sliding motion of two plates which pass one another by one plate sliding past another fixed plate. (Image courtesy of Michael Kimberly, North Carolina State Univ.)
- 6. Strain The adjustment towhich could result into a change volume or shape or could lead to breaking.
- 7. A. Elastic Strain -Whereinflexibility of rocks units are displayed by going back to their original shape after they are freed from stress. http://earthquake.usgs.gov/learn/glossary/?term=strain
- 8. B. Plastic Strain -Occurswhen rock units are deformed either by molding or bending after the stress was released. http://earthquake.usgs.gov/learn/glossary/?term=strain
- 9. B. Fracture Strain -Whenrock units break or crack. http://earthquake.usgs.gov/learn/glossary/?term=strain