Blog Archives

POSTED

Nov30

139 DAYS

Striation

An undesirable streaky, parallel groove pattern seen in faulty varnish, adhesive and coating application.

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POSTED

Nov30

139 DAYS

Stretching

The extension of the surface of a sheet in all directions. In stretching, the flange of the flat blank is securely clamped. Deformation is restricted to the area initially within …

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POSTED

Nov30

139 DAYS

Stretcher Strains

Elongated markings that appear on the surface of some sheet materials when deformed just past the yield point. These markings lie approximately parallel to the direction of maximum shear stress …

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POSTED

Nov30

139 DAYS

Stretcher Straightening

A process for straightening rod, tubing, and shapes by the application of tension at the ends of the stock. The products are elongated a definite amount to remove warpage.

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POSTED

Nov30

139 DAYS

Stretcher Leveling

The leveling of a piece of sheet metal (that is, removing warp and distortion) by gripping it at both ends and subjecting it to a stress higher than its yield …

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POSTED

Nov30

139 DAYS

Stretcher Leveled

A flattening process in which a material is stretched to achieve a desired flatness tolerance.

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POSTED

Nov30

139 DAYS

Stretch Forming

The shaping of a sheet or part, usually of uniform cross section, by first applying suitable tension or stretch and then wrapping it around a die of the desired shape. …

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POSTED

Nov30

139 DAYS

Stretch Former

A machine used to perform stretch forming operations. A device adaptable to a conventional press for accomplishing stretch forming.

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POSTED

Nov30

139 DAYS

Stretch Drawing

The process of holding a blank with an upper and lower ring, the lower ring being mounted on a nitrogen actuated pressure pad. Both upper and lower rings are lowered …

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Nov30

139 DAYS

Stress-Strain Diagram

A graph in which corresponding values of stress and strain from a tension, compression, or torsion test are plotted against each other. Values of stress are usually plotted vertically (ordinates …

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POSTED

Nov30

139 DAYS

Stress-Strain Curve

The curve plotting the applied stress on a test specimen versus the corresponding strain. Stress can be applied through shear, compression, flexure, or tension.

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POSTED

Nov30

139 DAYS

Stress Crack

External or internal cracks in a plastic caused by tensile stresses less than that of its short time mechanical strength. Note: The development of such cracks is frequently accelerated by …

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POSTED

Nov30

139 DAYS

Stress Relaxation

The decay of stress at a constant strain.

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POSTED

Nov30

139 DAYS

Stress Raisers

Design features (such as sharp corners) or mechanical defects (such as notches) that act to intensify the stress at these locations.

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POSTED

Nov30

139 DAYS

Stress Cracking

There are three types of stress cracking: 1. Thermal stress cracking is caused by prolonged exposure of the part to elevated temperatures or sunlight. 2. Physical stress cracking occurs between …

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