Definition from Wiktionary, the free dictionary
microstrain (plural microstrains)
- (physics) A strain expressed in terms of parts per million
- (materials science) The microstrain is the root mean square of the variations in the lattice parameters across the individual crystallites, usually accross microscopic distances, <ϵ2>1/2. By definition, it cannot be negative. In conrast, macrostrain refers to the overall change in the lattice parameters caused by a composition chnge or temperaure change or pressure change.
- Used especially in the field of materials science.