MAT E202 Lecture 3: Properties of Materials 2

• School: University of Alberta
• Department: Materials Engineering
• Course: MAT E202
• Professor: Thomas Etsell

Document Summary

A measure of the stress required to make a material fail in some manner. Is the stress necessary to cause significant plastic deformation. For some materials, the onset of plastic deformation is well defined and is then termed the yield point. Tensile strength (ts, st) or ultimate tensile strength (uts) Is the maximum stress a material can withstand before breaking. Fracture strength (fs, sf) is the stress at fracture. A measure of a material"s ability to be deformed. Where lo is the initial length of the sample or distance between two lines scribed on the surface (gauge length) Where lf is the final length after fracture. Since elongation increases as gauge length decreases, it is a gauge dependent value (usually 5cm is chosen) ii. iii. iv. Ao is the initial cross-sectional area and af is the final cross-sectional area after fracture. Mechanical behaviour is most commonly represented by engineering (nominal) stress strain curves.