Cushioning performance of flexible polyurethane foams.: An article from: Polymer Engineering and Science
Book Details
Author(s)G.L.A. Sims, J.A. Bennett
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB00098N1M2
ISBN-13978B00098N1M6
AvailabilityAvailable for download now
Sales Rank12,825,344
MarketplaceUnited States 🇺🇸
Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on January 1, 1998. The length of the article is 4496 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: Impact cushioning and deformation of flexible open-cell polyester polyurethane (PU) foams were studied as a function of specimen geometry, including the incorporation of controlled voids. It was shown that cushioning behavior is dependent on sample geometry, which was in turn due to a complex balance of air compression and air flow, which changes with surface area-to-volume ratio of the impact specimen. Deformation studies show that impact compression proceeded initially by crashing the surface layers with little or no deformation of the center layers. As bulk compression was increased, deformation progressively propagated from the collapsed layers tending to a more uniform strain distribution at high bulk compression strains. Local asymmetric strain patterns were exaggerated using square cushions, because of comer effects which complicated air flow paths. It was concluded that cushion curve determination of open-cell foams would be more accurately performed using circular samples and deflecting air pressure from the top surface of the cushion to more closely simulate practical conditions. When designing at or near the margin, the number of cushions should be kept to a minimum and open surface area to volume ratios minimized by adopting square rather than strip cushions.
Citation Details
Title: Cushioning performance of flexible polyurethane foams.
Author: G.L.A. Sims
Publication:Polymer Engineering and Science (Refereed)
Date: January 1, 1998
Publisher: Society of Plastics Engineers, Inc.
Volume: 38 Issue: 1 Page: 134(9)
Distributed by Thomson Gale
From the author: Impact cushioning and deformation of flexible open-cell polyester polyurethane (PU) foams were studied as a function of specimen geometry, including the incorporation of controlled voids. It was shown that cushioning behavior is dependent on sample geometry, which was in turn due to a complex balance of air compression and air flow, which changes with surface area-to-volume ratio of the impact specimen. Deformation studies show that impact compression proceeded initially by crashing the surface layers with little or no deformation of the center layers. As bulk compression was increased, deformation progressively propagated from the collapsed layers tending to a more uniform strain distribution at high bulk compression strains. Local asymmetric strain patterns were exaggerated using square cushions, because of comer effects which complicated air flow paths. It was concluded that cushion curve determination of open-cell foams would be more accurately performed using circular samples and deflecting air pressure from the top surface of the cushion to more closely simulate practical conditions. When designing at or near the margin, the number of cushions should be kept to a minimum and open surface area to volume ratios minimized by adopting square rather than strip cushions.
Citation Details
Title: Cushioning performance of flexible polyurethane foams.
Author: G.L.A. Sims
Publication:Polymer Engineering and Science (Refereed)
Date: January 1, 1998
Publisher: Society of Plastics Engineers, Inc.
Volume: 38 Issue: 1 Page: 134(9)
Distributed by Thomson Gale
