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Saturday, May 2, 2020 | History

4 edition of Diffusion Controlled Stress Relaxation of Swollen Rubber-Like Networks found in the catalog.

Diffusion Controlled Stress Relaxation of Swollen Rubber-Like Networks

D. E. Knibbe

Diffusion Controlled Stress Relaxation of Swollen Rubber-Like Networks

by D. E. Knibbe

  • 210 Want to read
  • 12 Currently reading

Published by Routledge .
Written in English

    Subjects:
  • Mathematics and Science,
  • Science / Chemistry / General,
  • Science/Mathematics

  • The Physical Object
    FormatPaperback
    Number of Pages60
    ID Numbers
    Open LibraryOL11128178M
    ISBN 100677611854
    ISBN 109780677611853

    So, stress relaxation results from atomic rearrangements due to thermally assisted self-diffusion, which reduces the stress level in the deflected contact spring. This reduces the contact normal force, which may decrease the mechanical stability of the contact interface, and make the interface susceptible to micromotions and increased contact. Stress relaxation testing provides a methodology for investigating the viscoelasticity of rubber or rubberlike materials. Certain structural characteristics that have been demonstrated to be evaluated by this test method are: (1) average molecular weight, (2) molecular weight distribution, (3) linearity or chain branching, (4) gel content, and (5) monomer ratio.

    Etude du gonflement de gels réticulés préparés par copolymérisation séquencée anionique Article in Die Makromolekulare Chemie (1) - March with 8 Reads How we measure 'reads'. Stress transmission flow is defined to describe an entropy-derived measure of stress between two interconnected individuals, and the analysis is extended to networked individuals to analyze stress diffusion in a theoretical setting that includes the modeling of complex networks and the use of agent-based models in a simulated by: 2.

      Stress–relaxation is a well-established mechanism for laboratory skin stretching, with limited clinical application in conventional suturing techniques due to the inherent, concomitant induction of ischemia, necrosis and subsequent suture failure. Under external tension, the interrelated networks of collagen, elastin, and ground substance Cited by: Fatigue, Stress, and Strain of Rubber Components: A Guide for Design Engineers [Bauman, Judson T.] on *FREE* shipping on qualifying offers. Fatigue, Stress, and Strain of Rubber Components: A Guide for Design EngineersCited by:


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Diffusion Controlled Stress Relaxation of Swollen Rubber-Like Networks by D. E. Knibbe Download PDF EPUB FB2

Get this from a library. Diffusion-controlled stress relaxation of swollen rubber-like networks. [David Engel Knibbe]. Diffusion-controlled stress relaxation of swollen rubber-like networks () Pagina-navigatie: Main; Save publication. Save as MODS; Export to Mendeley; Save as EndNoteCited by: 3.

Stress relaxation in the systems PVAc (polyvinyl acetate)‐water, PVAc‐methanol, PMA (polymethyl acrylate)‐water, and PMA‐methanol was measured at several temperatures above the glass‐transition points of the pure polymers in ranges of sufficiently low concentrations of diluents.

It was found that the time‐concentration superposition principle as proposed by Ferry is applied successfully to these data to obtain master relaxation curves Cited by: Abstract An approximate theory of the relaxation of stress in amorphous linear polymers accompanying sorption of a low molecular weight penetrant is worked out on the assumption that the relaxation Cited by: Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link); http://oai Author: D.E.

Knibbe. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link)Author: D.E. (author) Knibbe. These data can best be explained by postulating that the rate of diffusion of the dimethyl formamide‐water solution into the fiber controls the rate of stress relaxation.

The diffusion coefficient is found to be concentration dependent, and the diffusion process has an activation energy of 14 by: 4. Since PDMS is a rubbery polymer with no glass to rubber phase transition under the present condition, the polymer relaxation time k ~l defined here represents the stress relaxation time in a swollen rubbery network during sol- vent diffusion [11).Cited by: 7.

In the shrunken phase, the stress relaxation is governed by shear relaxation without swelling. The drastic change in the relaxation kinetics occurs within ± °C of the transition temperature. The results are analyzed in terms of the phenomenological theory of the stress effect on gels and the formal theory of elastic relaxation.

described above to estimate stress relaxation, there are some simplifying assumptions that make this method a little less than perfectly accurate. For one, most stress relaxation charts are done at specific initial stress levels, usually 75% of the yield strength.

Thanks to the prevalence of FEA, most parts areFile Size: 2MB. The swelling and stress relaxation kinetics for PAAm gels were also well described by the theory presented in this work. Simultaneous Swelling and Stress Relaxation Cited by: The swelling dynamics of long cylindrical gel is analyzed by the stress diffusion coupling model [T.

Yamaue and M. Doi, Phys. Rev. E 69, ()]. Two situations are analyzed: (i) stress induced swelling, where the swelling is caused by an elongational force applied on the gel, and (ii) free swelling, where the swelling is caused by thermodynamic force.

The relaxation times characterizing Cited by: Stress relaxation is a decreased tendency for the material to return to its original shape when unloaded. Figure 4 shows the stress-strain curve for a material undergoing stress relaxation.

Over time, the stress and force decrease, while the strain remains constant. It is important to note the part does not change shape during stress relaxation. Stress relaxation is a time-dependent decrease in stress under a constant strain.

This characteristic behavior of the polymer is studied by applying a fixed amount of deformation to a specimen and measuring the load required to maintain it as a function of time. Stress-relaxation data have been useful in many practical applications.

This paper is concerned with the modeling of slow diffusion of a fluid into a swelling solid undergoing large deformation. Both the stress in the solid as well as the diffusion rates are predicted. relaxation time.

When the applied rate of deformation is reduced to zero, these materials relax over their characteristic relaxation time - a constitutive property of each material.

This phenomenon is known as stress relaxation. 2 Flow of a non-Newtonian uid past a rigid sphere We will now look at the ow of a Non-Newtonian uid past a sphere. Long time stress relaxation of filled amorphous networks under uniaxial tension: dynamic constrained junction model.

Plastics, Rubber and Composites38 (8), DOI: /X Javier Sacristan Bermejo, Carmen Mijangos by: Stress Relaxation Processes In a stress relaxation experiment, a sample is rapidly strained to a fixed length at constant temperature and the stress is recorded as a function of time.

Since the length after stretching the sample is kept constant for the entire duration of the experiment, no macroscopic movement of the test specimen is possible.

Structure and elasticity of non-crystalline polymer networks. Authors; Authors and affiliations — The excluded volume in the theory of deformation of swollen network polymers. Vysokomolekul. 62, (). CrossRef Google Scholar. Knibbe, D. E.: Diffusion-controlled stress relaxation of swollen rubberlike networks.

Rotterdam Cited by: diffusion resistance and xylem potential in stressed and unstressed northern hardwood trees [federer, c.a.

& gee, g.w.] on *free* shipping on qualifying offers. diffusion resistance and xylem potential in stressed and unstressed northern hardwood treesAuthor: G.W. Federer, C.A.

& Gee. Kyung-Do Suh, Hidetoshi Oikawa, and Kenkichi Murakami () Chemical Stress Relaxation of NR Networks Prepared in the Swollen Chemistry and Technology: SeptemberVol.

59, No. 4, pp. Cited by: 1.Yoshio Hoei () Analysis of Stress-Strain Data for Dry and Swollen Rubbers by a New Tube Model of Rubber Elasticity Based on Finite Chain Chemistry and Technology: MayVol.

81, No. 2, pp. Cited by: 4.Understanding stress relaxation is important when the compliance of a tissue is being determined. Compliance is the ratio of the change in volume divided by the change in pressure.

However, because tissues such as blood vessels show some stress relaxation, it is important to measure the steady-state change in pressure after the volume is increased.