Consider the plots recorded during the tensile test. Did the strain gage record data for the full extent of the test, or did it fail at some point prior to the failure of the material? How would this affect your ability to predict the behavior of this material?

Ahelical coil spring has a mean diameter of 50 mm, a wire diameter of 5.5 mm and is wound with a pitch of 10 mm. the spring steel has an ultimate strength of 1250 mpa. find the force needed to compress the spring solid and the wire stress in this condition. state whether the spring will return to its initial length.