BIOL 4253 Lecture : Lecture18 Biogeography Fall2014
Document Summary
Chapter 8 vocabulary: brittle fracture - fracture that occurs by rapid crack propagation and without appreciable macroscopic deformation. Case hardening - hardening of the outer surface (or case) of a steel component by a carburizing or nitriding process; used to improve wear and fatigue resistance. Charpy test - one of two tests (see also izod test) that may be used to measure the impact energy or notch toughness of a standard notched specimen. An impact blow is imparted to the specimen by means of a weighted pendulum. Corrosion fatigue - a type of failure that results from the simultaneous action of a cyclic stress and chemical attack. Fatigue - failure, at relatively low stress levels, of structures that are subjected to fluctuating and cyclic stresses. Fatigue life - the total number of stress cycles that cause a fatigue failure at some specified stress amplitude.
