What is Characterization, and why do it?
Characterization enables quantification of physical properties
important for success of a part used in a given environment.
It assumes that the environment can be defined.
- Stress - tensile, compressive, flexure, etc.
- Impact, cyclical - including strain rate
- Phase content, surface morphology
- Thermal, electrical, etc., as applicable
- Elevated temperature - accelerates
chemical reactions, e.g., oxidation
- Micro structural effects may be present
Reasons for Characterization
- In design/development, must qualify a part
for the predicted environment, then test it in
prototype systems or carefully designed and
controlled "real world" use.
- If conducting a post mortem, the purpose is to
describe the steps leading to the observed failure
so future parts can be fixed -- usually through
- Regardless of motive for characterization
start with the environment of use: temperature,
stresses - type/magnitude, atmosphere - corrosive/