Results 241 to 250 of about 8,419 (294)
Some of the next articles are maybe not open access.
, 1969 Carrying loads with springy poles
Journal of Applied Physiology, 1991People throughout Asia use springy bamboo poles to carry the loads of everyday life. These poles are a very compliant suspension system that allows the load to move along a nearly horizontal path while the person bounces up and down with each step. Could this be an economical way to carry loads inasmuch as no gravitational work has to be done to lift ...
openaire +2 more sources
The mechanical behavior of springy polypropylene
Polymer Engineering & Science, 1975AbstractTo obtain further details of the unusual behavior of the “hard elastic,” “springy” form of polypropylene (SPP), various loading conditions were studied with an Instron model 1130. Specifically, the variation of the elongation at rupture with change in gauge length and strain rate has been determined.
S. L. Cannon +2 more
openaire +1 more source
Ultradrawing of ?springy? polypropylene films
Polymer Bulletin, 1987It is demonstrated that in the process of ultradrawing of semicrystalline polypropylene the morphology of the initial material plays major role. Extremely high draw ratios are obtained (λmax≈50) when drawing “hard elastic” polypropylene films perpendicular to their initial molecular orientation. This behaviour is explained by the molecular processes of
J. Petermann, A. Karbach, K. Felt
openaire +1 more source
Springy Polypropylene: A Novel Elastomeric Biomaterial
International Journal of Polymeric Materials, 1977Abstract Polypropylene has been fabricated into a different molecular morphology which shows the usual stiffness and high strength indigenous to this polymer, but which also exhibits surprising elastic behavior. Fibers and films in this form are extensible to several hundred percent without rupture and yet show nearly complete recovery to their ...
S. L. Cannon, W. O. Statton
openaire +1 more source
Morphological mechanics of springy polymers
Journal of Polymer Science: Polymer Physics Edition, 1976AbstractThe mechanics of “springy” or “hard elastic” row‐crystallized polymers were investigated. It was found that their unique tensile and physical properties could be explained by adhesive fracture mechanics and simple beam deflection. The deformed lamellae had an apparent negligible modulus of flexural rigidity.
openaire +1 more source
Deformation of a spatial elastica constrained inside a springy tube
Acta Mechanica, 2019Most previous works on spatial elastica constrained inside a tube assumed that the tube wall is rigid. This assumption is not adequate when it involves human artery and tissue. In this paper, we study the deformation of a clamped–clamped rod constrained within a straight flexible tube.
Jen-San Chen, Der-Wei Chen
openaire +1 more source
A Springy Leg and a Double Backflip
IEEE Robotics and Automation Letters, 2023Juan D. Gamba, Roy Featherstone
openaire +1 more source
Hard-elastic or ‘springy’ polypropylene
1999In the 1960s it was discovered that polypropylene (PP), as well as several other highly crystalline polymers, can be extruded in the form of elastic fibers and films. These materials were termed as ‘hard’ elastic to distinguish them from common elastomers.
openaire +1 more source