Crumpling

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Crumpling

 

in strength of materials, a localized compressive stress, accompanied, as a rule, by permanent deformation (pressing down) of the material. Crumpling occurs in joints (bolted, riveted, key) in locations of structural supports, and in contact zones of compressed components.

The magnitude of crumpling stress in structures is usually kept below the allowable crumpling stress. This allowable stress is determined by the character of the surfaces in contact, the properties of the structural material, and the orientation of this material with respect to applied loads (for instance, with wood, parallel or perpendicular to the grain). Various design features aimed at reducing crumpling stresses and, more important, permanent deformation distribute the compressive stress over a large area with the aid of, for example, washers, liners, and pads. One of the most effective means for reducing deformation is the use of special inserts and fillers in the contact zones made of materials that are stronger than the structural material.

L. V. KASAB’IAN

References in periodicals archive ?
Davidovitch says they were inspired and moved toward a solution by thinking about how a familiar birthday balloon, made of two circular mylar foils, wrinkles and crumples (two separate processes).
Crumple one half section of newspaper into a ball for the head.
The traditional crumple tests were performed along with two other mechanical tests.
However, graphene is extremely difficult to handle in that it easily "crumples." Unfortunately, scientists have been unable to control the crumpling and unfolding of large-area graphene to take advantage of its properties.
For example, spidron reliefs could be used as shock absorbers or crumple zones in vehicles, Erdely says.
On the front end Volvo designed tiered crumple zones that absorb energy at different rates based on the type of steel used.
The collision caused Earth's crust to crumple into giant mountains.
into the manic bitchiness of his role in The Crumple Zone
I always put a donation in the envelope provided, but, sadly have watched countless people come and go through the waiting room and not one person has ever made a donation, In fact, they just crumple up the donation envelope and drop it on the floor.
If no bees have arrived by the time the flower starts to crumple with age, the stamens snap up anyway and dump pollen onto the flower's own female organ.
It takes energy to crumple a sheet-to force it uniformly into a smaller and smaller ball.
Railtrack was slammed yesterday for leaving pounds 400million worth of new trains in the sidings while passengers are forced to use 40-year- old rolling stock, which can crumple in a crash.