During a tensile experiment on a ductile material, the specimen will begin to neck prior to failure. Why are true stress and true strain difficult to calculate after the onset of necking?
What tools could you use to measure true stress and true strain throughout the whole test?

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Which of the following is an easy way to remember the modified “x” tire rotation? a. nondrive wheels straight, cross the drive wheels b. drive wheels straight, cross the nondrive wheels c. drive wheels crossed, nondrive wheels straight d. drive wheels crossed, nondrive wheels crossed

What is creep? what is stress relaxation?