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viscoelastic characteristics

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Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003024
EISBN: 978-1-62708-200-6
... Abstract This article discusses the deformation and viscoelastic characteristics of plastics as polymeric materials, focusing on the test methods used for the evaluation of their mechanical properties, methods available for analytically predicting the deformation response of polymers...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006941
EISBN: 978-1-62708-395-9
... strains. Analogous to the creep and stress relaxation experiments, which determine the time- and temperature-dependent functions, are the dynamic mechanical experiments, which define the frequency- and temperature-dependent functions characteristic of viscoelastic materials such as plastics. In any...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 30 January 2024
DOI: 10.31399/asm.hb.v12.a0006947
EISBN: 978-1-62708-387-4
... response of the material. The identification of characteristic fractographic features associated with the complex viscoelastic material response can also provide insight into the loading conditions that caused the fracture. Ductility is typically broken into two length scales: macro- and microductility...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006938
EISBN: 978-1-62708-395-9
... of the stress response of parts. The viscoelastic characteristics of polymers are an important performance differentiator relative to other classes of materials whose analysis traditionally forms the basis of the standard design curriculum of engineering schools. A thorough understanding of the viscoelastic...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003025
EISBN: 978-1-62708-200-6
... functions characteristic of viscoelastic materials such as plastics. Viscoelastic Models In the attempt to describe plastic materials in terms of their linear or nonlinear viscoelastic behavior, some time-dependent functions have to be determined (see the article “Deformation and Viscoelasticity...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003298
EISBN: 978-1-62708-176-4
... 24 ) characterized the frequency and phase velocity of their viscoelastic bars. The complex modulus of the polymer pressure bars is then calculated from the phase velocity and attenuation. Both of these quantities are bar-diameter dependent, and the frequency characteristics become less and less...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006676
EISBN: 978-1-62708-213-6
..., ASM International Overview Preparation: Test specimens must be plane-parallel and surfaces should be smooth General Uses Young s modulus and shear modulus Limitations Damping characteristics and viscoelastic behavior Polymer structure and morphology DMA is most useful when supported by other...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006444
EISBN: 978-1-62708-190-0
... A variety of techniques are available to optimize vibration characteristics. A simple approach is to use a relatively broadband nonresonant piezo stack actuator in place of the ultrasonic welder ( Ref 6 ). These actuators can be driven over a wide range of frequencies through a power amplifier. Broadband...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006934
EISBN: 978-1-62708-395-9
... of their viscoelastic or time-dependent properties, atom arrangements in long-chain molecules, mobility of the polymer chains, different bonding types (i.e., covalent intramolecular and weak intermolecular interactions), and temperature and rate-dependency characteristics. Creep failure in thermoplastic materials...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006930
EISBN: 978-1-62708-395-9
..., it is usually necessary to use multiple Maxwell or Kelvin–Voigt elements to obtain an accurate model of the observed behavior. Fig. 3 Illustration of viscoelastic behavior. Both viscous and elastic natures are observed. (a) Spring and dashpot in (a) series, Maxwell model and (b) parallel, Kelvin-Voigt...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006918
EISBN: 978-1-62708-395-9
... weight, crystallinity, degree of cross linking, and backbone molecular structure of the polymer ( Ref 26 – 60 ). Polymers are also prone to time-dependent behavior, and fatigue characterization must incorporate viscoelastic effects; such effects may include sustained loading, sensitivity to peak stress...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006674
EISBN: 978-1-62708-213-6
...-temperature (PVT) data, are equation-of-state thermodynamic properties that characterize the volume expansion and compressibility of viscoelastic materials. The PVT data are used to model injection-molding processes. Another use for the high-pressure dilatometer is the construction of unary and nonambient...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006928
EISBN: 978-1-62708-395-9
... Abstract This article briefly introduces some commonly used methods for mechanical testing. It describes the test methods and provides comparative data for the mechanical property tests. In addition, creep testing and dynamic mechanical analyses of viscoelastic plastics are also briefly...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006849
EISBN: 978-1-62708-395-9
.... Polymers are viscoelastic, that is, they respond to stress as if they were a combination of elastic solids and viscous fluids, but not always in a stable 50–50 proportion. The balance of the storage and loss components of a polymer is important in determining its melt processibility and functionality...
Book Chapter

Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003280
EISBN: 978-1-62708-176-4
... polymers, viscoelastic-plastic deformation may result in additional dissipational losses, Γ v . The stronger the interface (higher Γ 0 ), the more energy is dissipated through plastic and/or viscoelastic deformation (as well as through any other dissipation process). Other factors affecting Γ p and Γ v...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003007
EISBN: 978-1-62708-200-6
... Abstract Engineering plastics offer unique product benefits based on physical properties, or combinations of physical properties, that allow vastly improved product performance. Providing an overview of the general characteristics and the mechanical and environmental stress response...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003415
EISBN: 978-1-62708-195-5
... performance is a synergistic combination of fiber mobility and the viscoelastic characteristics of the thermoplastic matrix. Appropriate matching of the matrix and reinforcement allows predictable mechanical and physical properties, increased production part yields, design flexibility with detailed features...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003273
EISBN: 978-1-62708-176-4
... characteristic of metals ( Ref 14 , 15 , 16 ); parameters characteristic of damping and internal friction in polymers, such as the storage and loss modulus ( Ref 17 , 18 ); and the activation energy and stress exponent for creep ( Ref 19 , 20 , 21 , 22 , 23 , 24 , 25 ). IIT has even been used...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005619
EISBN: 978-1-62708-174-0
... ( Ref 7 ). In contrast to fusion welding processes, UW has several inherent advantages ( Ref 3 , 8 ) derived from its solid-state process characteristics and has been used as a versatile joining method in the electronics, automotive, and aerospace industries since the 1950s. Although numerous...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006944
EISBN: 978-1-62708-395-9
... crazing and fracture in polymeric materials, with a review of the behavior of the elastic modulus as a function of temperature or time parameters, emphasizing the importance of the viscoelastic nature of their deformation and fracture. The discussion covers the behavior of polymers under stress, provides...