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The Gent hyperelastic material model [1] is a phenomenological model of rubber elasticity that is based on the concept of limiting chain extensibility. In this model, the strain energy density function is designed such that it has a singularity when the first invariant of the left Cauchy-Green deformation tensor reaches a limiting value .
The Yeoh model for incompressible rubber is a function only of . For compressible rubbers, a dependence on I 3 {\displaystyle I_{3}} is added on. Since a polynomial form of the strain energy density function is used but all the three invariants of the left Cauchy-Green deformation tensor are not, the Yeoh model is also called the reduced ...
It is known colloquially among chemists as the "Rubber Bible", as CRC originally stood for "Chemical Rubber Company". [ 2 ] As late as the 1962–1963 edition (3604 pages), the Handbook contained myriad information for every branch of science and engineering.
Foam rubber (also known as cellular rubber, sponge rubber, or expanded rubber) is rubber that has been made with a foaming agent so that its structure is an air-filled matrix. Commercial foam rubber is generally made of synthetic rubber, natural latex, or polyurethane. Latex foam rubber, used in mattresses, is well known for its endurance.
The CRC Press was founded as the Chemical Rubber Company (CRC) in 1903 by brothers Arthur, Leo and Emanuel Friedman in Cleveland, Ohio, based on an earlier enterprise by Arthur, who had begun selling rubber laboratory aprons in 1900. [2] [3] The company gradually expanded to include sales of laboratory equipment to chemists.
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Block copolymers can "microphase separate" to form periodic nanostructures, as in the styrene-butadiene-styrene (SBS) block copolymer (shown at right). The polymer is known as Kraton and is used for shoe soles and adhesives. Owing to the microfine structure, a transmission electron microscope (TEM) was needed to examine the structure.
For rubber and biological materials, more sophisticated models are necessary. Such materials may exhibit a non-linear stress–strain behaviour at modest strains, or are elastic up to huge strains. These complex non-linear stress–strain behaviours need to be accommodated by specifically tailored strain-energy density functions.
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