The stress at which a material begins to deform plastically. Below this point, the material can generally return to its original shape after unloading.
Permanent deformation begins. In design practice, the selected allowable stress is normally reduced from material strength using an appropriate factor of safety and the relevant design standard.
The maximum engineering tensile stress a material can withstand before necking and eventual fracture. UTS is a key measure of the material's overall tensile capacity.
Maximum tensile stress. In design practice, the selected allowable stress is normally reduced from material strength using an appropriate factor of safety and the relevant design standard.
The engineering stress recorded when the specimen finally fractures. For ductile materials, fracture occurs after the stress has passed through the UTS and the specimen has necked.
Final rupture point. In design practice, the selected allowable stress is normally reduced from material strength using an appropriate factor of safety and the relevant design standard.