UTS is defined as

UTS is defined as

• A. The maximum resistance to fracture
• B. The initial yield stress
• C. The elastic limit
• D. The break strength in compression

Answer: (A)

Ultimate tensile strength is the maximum stress a material can withstand when being pulled in tension. In a standard tensile test, the stress rises to a peak as the specimen stretches, just before necking and eventual fracture; that peak is the UTS. It isn’t the yield stress (the point where permanent plastic deformation begins) or the elastic limit (where elastic behavior ends), and it isn’t about compression strength and fracture under compressive loading. So the best description is the maximum resistance to being pulled apart in tension.

Ultimate tensile strength is the maximum stress a material can withstand when being pulled in tension. In a standard tensile test, the stress rises to a peak as the specimen stretches, just before necking and eventual fracture; that peak is the UTS. It isn’t the yield stress (the point where permanent plastic deformation begins) or the elastic limit (where elastic behavior ends), and it isn’t about compression strength and fracture under compressive loading. So the best description is the maximum resistance to being pulled apart in tension.