Specifications and for quality control of a product. Quite reproducible property, it is useful for the purposes of In the same sense that the chemical composition serves to identify aįurther, because the tensile strength is easy to determine and is a Property, and as such it is a very useful identification of a material To determine the strength of materials, it has become a very familiar However, because of the long practice of using the tensile strength Trend is to the more rational approach of basing the static design of Tensile strength, suitably reduced by a factor of safety. Of stress, which are usually encountered.įor many years it was customary to base the strength of members on the To the useful strength of the metal under the more complex conditions It will be shown that this value bears little relation Which a metal can withstand under the very restrictive conditions of The tensile strength should be regarded as a measure of the maximum load, Significance with regard to the strength of a metal. The tensile strength is the value most often quoted from the results ofĪ tension test yet in reality it is a value of little fundamental Load divided by the original cross-sectional area of the specimen. The tensile strength, or ultimate tensile strength (UTS), is the maximum To deform the specimen falls off and the engineering stress likewiseĬontinues to decrease until fracture occurs. Strain hardening increases the deformation load, the actual load required All further plastic deformation is concentrated in this region,Īnd the specimen begins to neck or thin down locally.īecause the cross-sectional area now is decreasing far more rapidly than Reached first at some point in the specimen that is slightly weaker than Eventually a point is reached where theĭecrease in specimen cross-sectional area is greater than the increase inĭeformation load arising from strain hardening. In area and the engineering stress (proportional to load P) continues to Initially the strain hardening more than compensates for this decrease