Tensile Test:
Tensile test is a simple test, wherein the specimen in question is subjected to uni-axial load (pulled apart) till failure. This test is used to plot the stress - strain curve there by coming to conclusion about
- Yield point
- Elasticity limit
- Point of Proportionality
- and lot more factors including, true breaking stress, fracture point load, ...
A sample of specimen is taken, and is pulled apart in apparatus known as Universal testing machine. The length and cross section area of sample are decided as per our needs. Nomenclature of the specimen is shown in figure.
Once the equipment is set up, the load on the specimen is gradually increased noting down the stress and strain levels till the point of rupture (i.e. fracture). A typical curve for ductile materials is shown here:
In figure,
the points to be noted include:
- Proportionality zone .. i.e the zone where HOOK's law is valid
- The region where elasticity is exhibited
- The zone where material yields and plastic deformation happens
- The ultimate tensile strength & the uniform elongation of specimen till then
- The fracture point and the local necking which happens before fracture
with warm regards
AllmYPosts
PS: Some info has been taken from Wikipedia and from http://invsee.asu.edu/. Please do refer to them for more info
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