Mechanical Sciences

Our engineers must take into consideration millions of newtons of thrust, millions of pascals in shear strain and stress, thousands of degrees in temperature fluctuations, \

STRESSES

There are two types of stresses most commonly associated with mechanical design: normal stress and shear stress.

Normal Stress: When a load is being applied perpendicular to the cross sectional area. This includes true normal stress, bearing stress and bending stress (due to a bending moment).

Shear Stress: When a load is being applied parallel to the cross sectional area. This includes true shear stress and torsion stress (due to a twisting moment).

It is important to consider the stresses in the designs and not just the forces on them alone because there must be a parameter to compare the strength of the materials themselves and not just the objects they form. A measurement that is independent of the area of loading is required so that only the internal properties of the materials can be assessed.

FACTOR OF SAFETY

In order to prevent unpredictable failure, designs must be able to withstand stresses greater than they are predicted to encounter.

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