PSAD TERMS

Yield Stress

It is the yield load divided by the original cross section of a material.

Ultimate Engineering Stress

It is the ultimate load carried by the material divided by its original cross-section

Ultimate True Stress

It is the ultimate stress carried by the material divided by the cross-section at the fracture point.

Orthotropic

The composite material exhibits elastic properties in one direction different from that in the perpendicular direction.

Homogenous

The material has the same composition as every point, but the elastic properties may not be the same in all directions. `

Ductility

The ability of a material to experience substantial plastic deformation under tensile stress before fracturing.

A design philosophy classified as an elastic design.

Allowable Stress Design (ASD)

Statics

A branch of mechanics which studies the effects and distribution of forces of rigid bodies which are and remain at rest.

Normal Stress

This term refers to the stress elements’ internal force acting perpendicular to the exposed cross-sectional area.

Shear Stress

A type of stress tending to cause deformation of a material by slippage along a plane or planes parallel to the imposed stress.

Bearing Stress

Refers to the contact pressure between separate bodies.

Circumferential Stress

It is the stress acting along the circumferential direction, it is generally tensile in nature.

Ductile Material

Is one having relatively large tensile strains and can be deformed without breaking up to the point of rapture. (e.g. steel and aluminum)