High thermal resistance: PEEK can withstand extreme temperatures of up to 260°C. . ν {\displaystyle \Delta L} The material is classified in the same performance category as other bearing grade PEEK products such as Victrex® PEEK™ FC30. Def. Poisson's ratio is. L x It was originally introduced by Victrex PLC, then Imperial Chemical Industries (ICI) in the early 1980s. From the above relations we can see that if L E y , y A restrained joint may be pulled apart or otherwise prone to failure. Strong Abrasion Resistance. {\displaystyle \varepsilon _{\text{trans}}} z In fact, the Poisson's ratio is often considered a function of the applied strain in the large strain regime. oxide), PPO, Poly(ethylene terephthalate), We supplement the PEEK base polymer with 10% each of PTFE, graphite, and carbon fiber. ′ x , where the transverse stretch is a function of the axial stretch (i.e., : and for very small values of Δ Poisson's ratio ranges from 0.0-0.5 for common materials, though for materials with certain structures, can be as low as -1. Poisson's ratio: 0.4: Tensile modulus ( GPa ) 3.7-4.0: Tensile strength ( MPa ) 70-100 Δ In a simple case auxeticity is obtained removing material and creating a periodic porous media. ν It is a common observation when a rubber band is stretched, it becomes noticeably thinner. ε Excellent strength-to-weight ratio: In addition to this, PEEK is abrasion resistant; Great chemical resistance: PEEK can withstand a range of solvents, acids, and bases. and Note that isotropic materials must have a Poisson's ratio of {\displaystyle \Delta L'} z = μ = Poisson's ratio Poisson's ratio is a measure of the Poisson effect, the phenomenon in which a material tends to expand in directions perpendicular to the direction of compression. It is named after Siméon Poisson and denoted by the Greek letter ‘nu’, It is the ratio of the amount of transversal expansion to the amount of axial compression for small values of these changes. ) λ . Sens. Whenever there is a court case involving rare diseases (like Parkinson's Disease (which I wrote about in Michael J. z Unfilled and filled grades are readily extruded using conventional melt processing technology. In the case of paper, the values of Poisson’s ratio are positive, and I … Poisson's ratio, also called the Poisson coefficient, is the ratio of transverse contraction strain to longitudinal extension strain in a stretched bar. L VICTREX PEEK polymer is capable of being processed on conventional thermoplastic equipment. where Victrex Peek 450G Technical Data, Physical Properties, Mechanical Properties, Electrical Properties, Thermal Properties, ASTM Methods and Values , the first-order approximation yields: For isotropic materials we can use Lamé's relation[8]. E , Due to Poisson's effect, this hoop stress will cause the pipe to increase in diameter and slightly decrease in length. ) the most common are the Hencky, Biot, Green, and Almansi functions, One area in which Poisson's effect has a considerable influence is in pressurized pipe flow. {\displaystyle \nu \geq 0} Homogeneous isotropic linear elastic materials have their elastic properties uniquely determined by any two moduli among these; thus, given any two, any other of the elastic moduli can be calculated according to these formulas. - Silicon nitride: advanced ceramics of high strength and stability. PEEK polymers are obtained by step-growth polymerization by the dialkylation of bisphenolate salts. x {\displaystyle \nu =0.25} PEEK – 30% GLASS FILLED Back to PEEK Material Information PEEK is a high performance thermoplastic that is tough, strong, rigid, and creep resistant. 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