Tensile Testing
The Stress-Strain graph and the test specimen used in a tensile test are shown.
A - Upper yield point
B – Tensile strength
C – Fracture point
Up to point A, the material still has the ability to return to its original length - this is the elastic region.
Up to point B, the specimen will have thinned uniformly as the load increased. At this point, the specimen will begin to ‘neck’ as it elongates with
applied force.
At point C, the specimen will have fractured with the distinctive ‘cup and cone’ fracture. One side of the specimen has a rough cone shape and the other has a hollow cup shape.
