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viscoelasticity

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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, and the...
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
... Abstract Dynamic mechanical analysis (DMA) is a powerful tool for studying the viscoelastic properties and behavior of a range of materials as a function of time, temperature, and frequency. This article describes various systems and equipment used in DMA setup and discusses the processes...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003025
EISBN: 978-1-62708-200-6
... Abstract Mechanical properties are often the most important properties in the design and selection of engineering plastics. Temperature, molecular structure, crystallinity, viscoelasticity, and effects of environment, fillers and reinforcements are considered as the basic factors affecting the...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005676
EISBN: 978-1-62708-198-6
... tissue engineering viscoelasticity POLYMERS offer a wide range of choices for medical applications because of their versatility in properties and processing. Polymers offer significant advantages over metals, including resistance to degradation in contact with physiological fluids, manufacturability...
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
... viscoelastic heating of the specimen, its coating, and a specially applied absorptive coating, such as vibration dampening adhesive ( Ref 9 ) and pressure-sensitive adhesive (e.g., Command adhesive from 3M Co.) poster strips ( Ref 1 ). Thermal imaging of the mode pattern is illustrated by the vertical bands...
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
..., 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 phase diagrams...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003007
EISBN: 978-1-62708-200-6
... of the Handbook. Thermosetting molding compounds are almost always reinforced; these materials are described at length in the article “Thermosets” in this Section. Designing with plastics is often a more complex task than designing with metals. Engineering plastics, which are viscoelastic, do not...
Book Chapter

By Rebecca Tuszynski
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003011
EISBN: 978-1-62708-200-6
... any material are modulus (stiffness) and damping (ability to dissipate energy). Typically, some energy is lost (converted to heat) in any deformation process. Viscoelastic response was originally modeled with a spring (elastic component) and dashpot (viscous response). For the spring, strain is...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003030
EISBN: 978-1-62708-200-6
... ). In addition, differences in mechanical properties such as viscoelasticity, strain rate sensitivity, and thermal conductivity may lead to additional friction-generating mechanisms. The two most important friction-generating mechanisms for polymeric materials are surface adhesion and mechanical...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003023
EISBN: 978-1-62708-200-6
... glass to rubber is not a thermodynamic transition, but rather a manifestation of viscoelasticity, the exact value of the T g depends on the method used to measure it and the rate at which the temperature is changed during the measurement. For this reason, these parameters must be specified when...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006672
EISBN: 978-1-62708-213-6
... of an impact-modified nylon 6/6 resin, differences in the impact modifiers resulted in the observed performance variation. From the results and the observed performance, it appeared that the material used to produce the failed clips had different viscoelastic properties, which produced a greater...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006036
EISBN: 978-1-62708-172-6
... in viscoelastic properties with decreasing functionality of the HDI adduct, the tensile and elongation properties do not change much as the polyaspartic ester structure is changed. Using isocyanate-terminated prepolymers (e.g., IPDI or HDI prepolymers) has the expected effect of lower tensile and...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.9781627082136
EISBN: 978-1-62708-213-6
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005672
EISBN: 978-1-62708-198-6
... regardless of whether a true chemical reaction is involved. Sometimes, curing merely refers to solvent evaporation, polymer viscoelastic relaxation, or physical aging ( Ref 2 , 3 ). Curing techniques depend on the chemistry of the individual adhesive. The most commonly used techniques can be categorized...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005668
EISBN: 978-1-62708-198-6
... only a guide and have notable exceptions. For example, the first law is well obeyed by most metals and ceramics but not by polymers, which are often in elastic contact and exhibit high viscoelasticity. The third law is applicable once the velocity is high enough to initiate sliding, but the tangential...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003039
EISBN: 978-1-62708-200-6
... hybridization, in which multiple fibers are introduced into the laminate. For example, when viscoelastic polyethylene fibers are used with graphite fibers, a tough interply hybrid laminate can be produced. Other forms of hybridization, such as adhesive layers of film between prepreg plies, also show promise...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006044
EISBN: 978-1-62708-172-6
... fraction of the polymer backbone. The T g is an important property in determining the viscoelastic behavior of the polymer and is easily manipulated by choosing the proper ratios of the various monomers. As shown in Table 1 , each monomer has an associated T g for its homopolymer. A number of...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003021
EISBN: 978-1-62708-200-6
... process comprises four distinct phases when tie layers are employed. The rapid increase in temperature up to the polymer melting point results from frictional heating at surface asperities and, to a much lesser extent, viscoelastic dissipation. In phase II of the ultrasonic welding process, bulk melting...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005685
EISBN: 978-1-62708-198-6
... reaction based on the physical properties of the sample surface. One example is phase-detection microscopy, where changes in the phase lag in intermittent-contact-mode AFM indicate variations in the surface properties, such as viscoelasticity or mechanical properties. Another typical example is the use of...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003047
EISBN: 978-1-62708-200-6