Week 1 vocab Flashcards
What are two main factors in possible tissue injury?
- nature of the loads
- properties of the tissue
High load
Single traumatic event
Repetitive loads
Involve end range (i.e. postural syndromes)
Three basic load types
Tensile, compressive and shear
Another way to express load
Stress: stress is the load divided by the cross sectional area (Newtons/Meter)
Three bassic stress types (in relation to load)
Tesile stress, compressive tress, shear stress
Deformation
A change in length in response to load
Three basic types of deformation (in relation to load)
Tensile deformation, compressive deformation and shear deformation
Strain
Another way to express the amount of deformarion that has occured (change in length divided by the origional lenght)
Trlatin of strain and the three basic types of load
Tensile and compressive - the % of length change
Shear- angle of deformation in radians
Elasticity
Ability of a material to return to its origioanal form, following the removal of a deforming load.
There is NO energy loss in one cycle of loading and unloading
Plasticity
The property of a material to permanently deform if loaded beyond its elastic range.
Lose- original form and energy after one cycle.
Ll. tearing can lead to hypermobility.
Stiffness
Measure of resistance offered to external loads by a material as it deformes.
A stiff material needs MORE STRESS TO DEFORM
-stiffness = (amount stress, load/ amount strain, deform)
