ultimate strength

(mechanics) The tensile stress, per unit of the original surface area, at which a body will fracture, or continue to deform under a decreasing load.

The greatest stress that may be induced in a material or object before or during rupture; may be compressive, tensile, or shear strength. See also strength, tensile.

Of a material in tension, compression, or shear: the maximum value of tension, compression, or shear, respectively, that the material can sustain without failure.

In biomechanics, the maximum stress that a material is capable of withstanding.