STRENGTH OF MATERIALS

Strength of materials deals with the relations between the external forces applied to elastic

bodies and the resulting deformations and stresses. In the design of structures and

machines, the application of the principles of strength of materials is necessary if satisfactory

materials are to be utilized and adequate proportions obtained to resist functional

forces.

Forces are produced by the action of gravity, by accelerations and impacts of moving

parts, by gasses and fluids under pressure, by the transmission of mechanical power, etc. In

order to analyze the stresses and deflections of a body, the magnitudes, directions and

points of application of forces acting on the body must be known. Information given in the

Mechanics section provides the basis for evaluating force systems.

Stress is force per unit area and is usually expressed in pounds per square inch. If the

stress tends to stretch or lengthen the material, it is called tensile stress; if to compress or

shorten the material, a compressive stress; and if to shear the material, a shearing stress.

Tensile and compressive stresses always act at right-angles to (normal to) the area being

considered; shearing stresses are always in the plane of the area (at right-angles to compressive

or tensile stresses).

Elastic limit is the maximum stress to which a test specimen may be subjected and still

return to its original length upon release of the load. A material is said to be stressed within

the elastic region when the working stress does not exceed the elastic limit, and to be

stressed in the plastic region when the working stress does exceed the elastic limit. The

elastic limit for steel is for all practical purposes the same as its proportional limit.

## E-NOTA

- KAJI DAYA BAHAN (STRENGTH OF MATERIALS)

-TEKNOLOGI AUTOMOTIF (AUTOMOTIVE TECHNOLOGY)

- ENJIN PEMBAKARAN DALAM (INTERNAL COMBUSTION ENGINE)

- ENJIN PEMBAKARAN DALAM (INTERNAL COMBUSTION ENGINE)

- KAJIDAYA KENDERAAN BERMOTOR (MECHANICS OF MOTOR VEHICLE)

## Saturday, November 14, 2009

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