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DM terms 2
Terminology of Mechanical properties
| Question | Answer |
|---|---|
| Relative inability of a material to deform plastically | Brittleness |
| Relative ability of a material to deform plastically under a tensile stress before it fractures | Ductility |
| Deformation that is recovered upon removal of an externally applied force or pressure | Elastic strain |
| Relative stiffness of a material; ratio of elastic stress to elastic strain | Elastic modulus (Modulus of elasticity or Young's modulus) |
| The critical stress intensity factor at the beginning of rapid crack propagation in a solid containing a crack of known shape and size | Fracture toughness |
| Resistance of a material to plastic deformation | Hardness |
| Maximum amount of plastic strain a tensile test specimen can sustain before it fractures (See Ductility) | Percent elongation |
| Deformation that is not recoverable when the externally applied force is removed | Plastic strain |
| Force per unit area acting on the external surface of a material | Pressure |
| Maximum stress at which stress is proportional to strain and above which plastic deformation occurs | Proportional limit |
| The relative amount of elastic energy per unit volume released on unloading of a test specimen | Resilience |
| Force per unit area within a structure subjected to an external force or pressure (See Pressure) | Stress |
| Area or point of significantly higher stress associated with a structural discontinuity such as a crack or pore or a marked change in dimension of a structure | Stress concentration |
| Change in length per unit initial length | Strain |
| Increase in strength and hardness and corresponding decrease in ductility of a metal that is caused by plastic deformation | Strain hardening (Work hardening) |
| Change in strain per unit time during loading of a structure | Strain rate |
| Maximum stress that a structure can withstand without sustaining a specific amount of plastic strain (___A___) or stress at the point of fracture (___B___) | Strength; A=yield strength; B=ultimate strength |
| Ability of a material to absorb elastic energy and to deform plastically before fracturing; measured as the total area under a plot of tensile stress vs. tensile strain | Toughness |
| The stress at which a test specimen exhibits a specific amount of plastic strain | Yield strength |
Created by:
sean.sebourn
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