During the plastic deformation portion of a uniaxial compression test, two cylindrical specimens first maintain its cylindrical shape (decreasing in length and increasing in diameter), then:
a. Specimen 1 transitions into barreling (the specimen attains a barrel shape) and the breaks. b. Specimen 2 breaks without barreling.
Give, in two separate paragraphs with no less than eight (8) lines each, your explanation for these two behaviors.