An undesirable streaky, parallel groove pattern seen in faulty varnish, adhesive and coating application.
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 …
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 …
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.
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 …
A flattening process in which a material is stretched to achieve a desired flatness tolerance.
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. …
A machine used to perform stretch forming operations. A device adaptable to a conventional press for accomplishing stretch forming.
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 …
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 …
The curve plotting the applied stress on a test specimen versus the corresponding strain. Stress can be applied through shear, compression, flexure, or tension.
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 …
The decay of stress at a constant strain.
Design features (such as sharp corners) or mechanical defects (such as notches) that act to intensify the stress at these locations.
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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