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DM terms 2

Terminology of Mechanical properties

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