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Mechanical Properties of Materials a) Define yield strength and ultimate tensile strength of a material. What is the significance of using engineering stress-engineering strain and true stress-true strain curves?
b) Give the physical arguments for why steels have a definite yield point (upper and lower yield points) while metals like Al and Cu do not.

Respuesta :

By putting a material specimen through a compression or tension test, it is possible to determine the connection between stress and strain in a material.

By putting a material specimen through a compression or tension test, it is possible to determine the connection between stress and strain in a material. In this test, a test specimen is subjected to an axial force that increases gradually, and the deflection is recorded as the load rises. An illustration of this data might be a load-deflection curve. The test specimen's deflection is influenced by the specimen's geometry and elastic modulus of the material (area and length). It is helpful to generalize the data to eliminate the effect of geometry because we are interested in material behavior without regard to geometry.

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