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Biomechanics Exam 2 (Chp 9)
Terms in this set (16)
External forces that act on the body impose loads that affect the internal structures of the body.
Mechanical stress is the internal force divided by the cross-sectional area of the surface on which the internal force acts. F/A
How many types of stress?
Axial or normal stress that occurs at the analysis plane as a result of a force or load that tends to pull apart the molecules bonding the object together at that plane.
Object tends to deform by stretching or elongating.
Axial stress that results when a load tends to push or squash the molecules of a material more tightly together at the analysis plane. Deform by shortening in the direction of external forces.
Transverse stress that acts on the analysis plane as a result of the forces acting parallel to this plane. Cause blisters. Is perpendicular to tension and compression and is represented by tau.
Creates tensile and compressive stress.
A load caused by a twisting force and it causes shear stress. When greater diameter able to withstand greater torsional loads.
Combination load will cause both tension or compression and torsion.
Typically seen in bones or cartilage.
Quantification of the deformation of a material.
Linear Strain occurs as a result of a change in the object's length.
(change in length/original length*100)
Occurs with a change in orientation of adjacent molecules as a result of these molecules slipping past each other.
Compression in one area leads to bulging in another.
Ex: intervertebral discs.
When something deforms but returns to its original form.
Something is permanently deformed due to the size of a load. Happens when we exceed the elastic limit.
Tendons and ligaments
Strength depends on arrangement of collagen fibers.
Strongest in compression and weakest in shear. Affected by loading rate.
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