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|Title:||Dynamic mechanical properties of polyurethane elastomers using a nonmetallic Hopkinson bar||Authors:||Rao, S.
|Issue Date:||24-Oct-1997||Citation:||Rao, S.,Shim, V.P.W.,Quah, S.E. (1997-10-24). Dynamic mechanical properties of polyurethane elastomers using a nonmetallic Hopkinson bar. Journal of Applied Polymer Science 66 (4) : 619-631. ScholarBank@NUS Repository.||Abstract:||A modified split Hopkinson-bar apparatus, in which the striker and input/ output bars are made of polycarbonate instead of metal, was used to study three typical examples of a high-density flexible polyurethane elastomer (PORON) in sheet form. This variation of the device reduces a mismatch in impedance between the input/output bars and the specimen, thus allowing the stress in the specimen to reach a uniform state before significant engineering strain is induced. Dynamic compressive stress-strain curves were obtained from the measured incident, transmitted, and reflected waves. This article presents the behavior of these foams as a function of strain rate; for PORON 4701-05-20125-1637 under strain rates of 2.67 × 10-3 s-1 to 4500 s-1, the stress-strain response can be described by a function comprising a rate-dependent modulus and a strain-dependent factor, while for PORON 4701-01-30125-1604 and 4701-12-30062-1604, only loading at high strain rates yields similar characteristics. Empirical equations were derived to characterize these mechanical properties; in addition, characteristics relating to energy-absorption capability as well as deformation under approximately constant stress were also studied. © 1997 John Wiley & Sons, Inc.||Source Title:||Journal of Applied Polymer Science||URI:||http://scholarbank.nus.edu.sg/handle/10635/92685||ISSN:||00218995|
|Appears in Collections:||Staff Publications|
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