deformation

1.（）is also called tensile strength, which is obtained at the plastic　deformation region from the stress-strain diagram.2.Forming operations are those in which the shape of a metal piece is changed by（）deformation.3.Totally elastic deformation occurs very quickly, and the strain is independent of time.4.After a certain amount of time has elapsed under constant load, the creep strain (plastic deformation) will（）.5.Ductile materials can stand large plastic deformation without fracture.6.Toughness is the ability or capacity of a material to absorb energy during elastic deformation.7.A material subjects to a deformation under force and can go back to its original shape. We call the material undergoes an elasti8.A brittle material has very little plastic deformation.9.Dislocations make it easier for slip or plastic deformation to occur.