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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
For example, we can tune the graphene from being transparent to opaque by crumpling it, and tune it back by unfolding it," said Jianfeng Zang, a postdoctoral fellow in Zhao's group and the first author of the paper.
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These studies were originally motivated by the finding that widely varying physical systems emit pulses of energy comparable to the pops and clicks generated by crumpling paper.
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Crumpling can occur not only on the scale of a paper or plastic sheet but also at a molecular level.
The results of both experiments and computer simulations, whether they involve paper sheets or polymer membranes, provide important clues to the features that different crumpling processes may have in common.