Definition of “Mechanics” Science concerned with the motion of bodies under the action of forces, including the special case in which a body remains at.

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Presentation transcript:

Definition of “Mechanics” Science concerned with the motion of bodies under the action of forces, including the special case in which a body remains at rest. Of first concern in the problem of motion are the forces that bodies exert on one another. This leads to the study of such topics as gravitation, electricity, and magnetism, according to the nature of the forces involved. Given the forces, one can seek the manner in which bodies move under the action of forces; this is the subject matter of mechanics proper Encyclopædia Britannica

Classification of “Mechanics” ~studies of motion and the cause of motion~ Statics Dynamics Kenematics Kenetics Displacement Velocity Acceleration Force/Torque Energy/Momentum { { { Load/Deformation/Stress/Strain/Strain Energy

Concept of Stress 100 kg SteelRubber is stronger than Steel ???

From Force to Stress

Prismatic Bar under Axial Load

More Rigorous Definition of Stress

Shear Force and Shear Stress

Examples of Shear Force Transmission

Single Lap Shear and Double Lap Shear

Average Bearing Stress in Pin Joint

Stress on Oblique Plane

Stress under General Loading

Components of Stress

2-D Plane Stresses

Allowable Stress and Safety Factor  allowable =  ultimate /(Safety Factor) uu a?a?