Additionally, a specimen is prepared from a common food can in such a way as to test the strength of the spot weld. The applicability of this test to different materials is discussed. The results are presented in the form as a poster which is a type of presentation not exercised by other courses. Work hardening Mild steel is used in an annealed form since it has a large extendibility. The specimen and procedure used are the same as described above in the tensile testing experiment.
Mild steel is plastically deformed and then the load is released.
The effects of this initial extension are treated as plastic deformation and the change in yield strength is observed. This loading into the plastic deformation regime is repeated several times until the material fractures. Results are interpreted as strengthening a material and reducing the ductility of a material. Fatigue Specimens are prepared similar to the dog-bone specimens in tensile testing. They are placed in a fatigue testing machine where a load is supported in a cantilever fashion.