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the
ability of the material to return to its original shape after a deforming
force is removed |
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Rubber is elastic |
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Taffy is not elastic |
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Metals ? |
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the
amount of stretch is directly related to force applied (Hooke’s Law) |
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The “cause” of deformation. The ratio of force
to cross-sectional area. |
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tensile |
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compressive |
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shear |
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The “effect” of applied forces. The relative
change in dimensions. |
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Within the elastic limit, the ratio of stress to
strain is constant. The elastic constant is called the Modulus of
Elasticity. |
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For tensile or compressive stresses the elastic
constant is called Young’s Modulus. |
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For shear stresses the elastic constant is
called the Shear Modulus. This is also known as the Modulus of Rigidity. |
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When considering three dimensional force the
terms volume stress and volume strain are used. The ratio of volume stress
to volume strain is called the Bulk Modulus. The reciprocal of the Bulk
Modulus is called the compressibility (k). |
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Cohesion |
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Adhesion |
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hardness |
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ductility |
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malleability |
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conductivity (thermal and electrical) |
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What is being asked for ? |
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What is given ? |
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What facts(formula) relate what is asked with
what is given ? |
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Substitute |
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Calculate |
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CHECK THE ANSWER!! |
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Does it answer the question? |
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Does it make sense? |
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Is there a need for rounding? |
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Notes