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'1.a) Materials strength and Elastic modulus may change depending on the temperature: Explain this situation regarding the atomic structure and the energy: b) Which factors are effective in choosing a material such as a gear? What properties should such material have?' 

          '1.a) Materials strength and Elastic modulus may change depending on the temperature: Explain this situation regarding the atomic structure and the energy:
b) Which factors are effective in choosing a material such as a gear? What properties should such material have?'
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University Physics with Modern Physics
University Physics with Modern Physics
Hugh D. Young 14th Edition
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'1.a) Materials strength and Elastic modulus may change depending on the temperature: Explain this situation regarding the atomic structure and the energy: b) Which factors are effective in choosing a material such as a gear? What properties should such material have?'
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Transcript

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00:01 Hello everyone in the part a of the problem we are discussing on the dependence of material strength and elastic modulus on temperature now for any material say this is the material and we are discussing about several atoms so the positions are in that manner so that the potential energy is minimum so whenever we try to change the position of this atom, the matter from inside tries to bring the atoms back to its initial position to keep the potential energy minimum.
00:44 Now when temperature increases, that increase in temperature will try to change the position of the atom.
01:00 So to bring the atoms back to the initial position the matter has to give effort so internal restoring force will come into play but elastic modulus say for in for example young's modulus is f by a that is restoring force by divide by the area into change in length by original length so this youngs modulus is material based quantity yungs modulus is a constant quantity of the material and the other parameters will change accordingly to keep it constant so when temperature increases the internal restoring force makes the body more malleable that that is it in part b specific properties of gear material here first point is it should have high fatigue strength and having high fatigue strength means it helps to withstand load point 2 is high tensile strength it helps to be safe against static load and the third and important point is low coefficient of friction and this characteristic helps to overcome dissipative force so these properties, these three properties are very important for a gear material...
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