1.5 HOOKE'S LAW AND MODULUS OF ELASTICITY
We can learn some of the mechanical properties by performing tensile tests using a testing machine that can impose a pure axial load. From these tests, we have some data and data of which are stress and strain occur on the specimen being studied. Examples of stress-strain diagram is as figure 5.3.
We can learn some of the mechanical properties by performing tensile tests using a testing machine that can impose a pure axial load. From these tests, we have some data and data of which are stress and strain occur on the specimen being studied. Examples of stress-strain diagram is as figure 5.3.
In the elastic limit (0-1), the material will return to its original condition after its release. It meets one law called Hooke's Law, which states that stress is proportional to the strain of an elastic material so long as does not exceed the elastic limit. Thus, a constant that can show this Hooke's law, the Young's Modulus (Modulus of Elasticity), where it also is the slope straight line in the elastic limit.
Units for young modulus is Pascal (Pa).
... From the basic equation:
... From the basic equation:
Apart from the stress-strain data, several other results can be known from tensile tests carried out, including
From the results obtained, several new properties of materials are available, namely:
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