Kentucky Trees. This website provides information on many of the common trees native to Kentucky. We hope you find it informative. This site is maintained by the Department of Horticulture at the University of Kentucky and is a collaborative effort between Robert Geneve, Richard Durham, Christy Cassady and Tom Shearin. Special thanks to Timothy Geneve for help with the propagation section.
strain 1 (strÄn) v. strained, strainÂ·ing, strains. To pull, draw, or stretch tight. To stretch or exert one's muscles or nerves to the utmost. To injure or impair by overuse or overexertion; wrench. To filter, trickle, percolate, or ooze. To pass a liquid through a filtering agent such as a strainer. To draw off or remove by filtration. n. The act of straining.
Definitions of stress and strain. Nominal stress: the force on the object divided by the original area. True stress: the force on the object divided by the actual area. E.g., when necking occurs the true stress is the force applied divided by the area of the neck. The unit for stress is Nm-2, or Pa. Nominal strain: change in dimension / original dimension. This is also known as the engineering strain, and is strictly only true for very small displacements.