The Effects of Loading

Mechanical Stress Concerned with the HOW force is distributed –

Force divided by area over which it acts (same units as PRESSURE – BUT pressure represents force distribution external to a body, Stress is the resulting force distribution INSIDE a body subjected to an external force.

PIC HERE pressure vs stress and stress strain graph

Mechanical Strain Amount of deformation of a structure divided by its original length or its original angular orientation. STRAIN = RELATIVE DEFORMATION

A STIFF object has greater COMPRESSIVE strength

A more ELASTIC/FLEXIBLE object has greater TENSILE strength

AFTER this add slides of loads on shoulder, elbow, hip etc.

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