The Visco-Elastic Properties of Wool Fibres

Peters, Laura; Speakman, J. B.

doi:10.1080/19447014808663155

Cited by 9 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The present theory also predicts that the form of the bond-breaking reaction should be similar to equation (14) for small stresses if OF* is the true activation energy barrier; otherwise equation (4) should hold and for small stresses the quadratic form of (5) is correct. For the bond re-formation reaction, however, difficulties immediately emerge.…”

mentioning

confidence: 61%

“…A two-state model has already been devised [2,5] ] which exhibits both nonlinear elasticity and nonlinear viscosity, but the approach was on the same lines as the Eyring model and, to bring the theory into agreement with data on keratin fibers, an additional independent Hookean spring had to be introduced in series with the two-state model. Arbitrary non-Hookean springs have also been postulated to bring the theoretical predictions of the three-element model into better agreement with experimental data [3], but there is little to be said in favor of such approaches.…”

mentioning

confidence: 99%

“…Burte and Halsey [2] and Peters and Speakman [5] also make this assumption, whereas Prandtl [6] assumes the barrier to decrease linearly with the bond deformation.…”

mentioning

confidence: 99%

See 2 more Smart Citations

A Note on Nonlinear Viscoelasticity

Peters¹

1955

Textile Research Journal

Self Cite

View full text Add to dashboard Cite

mentioning

confidence: 61%

mentioning

confidence: 99%

See 1 more Smart Citation

A Note on Nonlinear Viscoelasticity

Peters¹

1955

Textile Research Journal

Self Cite

View full text Add to dashboard Cite

“…Full theoretical discussion of the appropriate reaction rate theory, applied to the a-fJ transformation of wool fibers, from which Equation 2 is derived, is given elsewhere [2,3,7,8].…”

Section: Methodsmentioning

confidence: 99%

Creep of Wool Fibers

Balasubramaniam

Whiteley

1963

Textile Research Journal

View full text Add to dashboard Cite

The molecular mechanical constant a which is directly related to flow hole volume is calculated for wool fibers exhibiting a range of stress-strain properties. It is found that the value of the stress developed at 30% strain (Sgo) is invese1y proportional to the value. of a and that the product of a and SgO is constant. This relationship suggests that the differences observed between wool fibers in water are due to variations in the number of~ow units per unit cross sectional area. These variations, in turn, offer an explanation of the large differences in creep behavior among wool fibers in water under constant stress.where lt is strain at time t, and a and b are constants. Now for each single fiber we have a series of creep curves under varying loads. The values of a are obtained for each fiber by plotting lilt against 1ft. The gradient of the straight line obtained by plottingIn a against load gives the value of a for each of this Sao value is employed, and the fibers are subjected to this load for a short time at 100% RH. The experiment can be repeated without permanent damage-to the fiber. Since our original experiments, however, we have noted that some fibers cannot be loaded for the time periods previously used [10] without the onset of permanent damage. If the experiment is limited to 3-min duration the fiber will survive three loadings provided a period of 24 hr is allowed to elapse between successive loadings. On recalibration the Sao value will lie within ±2% of the original. If shorter experiment times are used the number of loadings can be progressively increased. In the present work all experiments were carried out in distilled water at 20.0°C ± 0.2°C, and each fiber was subjected to loads of 70%, 75%, and 80% of its Sao value. Fibers were then recalibrated to ensure that they exhibited no signs of permanent damage.For short times Feughelman [4] has noted that creep curves obey the following relationship in the yield region.

show abstract

“…For wool fihers tested in 98%, formic acid the Hookean region disappears. The fiber is swollen cliantetrally ahout 50%, and the x-ray diffraction pattern disappears ( 17 ] . (No significant longitudinal swelling was ohserved. )…”

mentioning

confidence: 97%

The Post-Yield Region and the Structure of Keratin

Feughelman¹

1964

Textile Research Journal

View full text Add to dashboard Cite

The load-extension curve of wool fibers under a variety of conditions and treatments shows little change in mechanical extensibility in the post-yield region (extension greater than ∼30%). This taken together with x-ray and water swelling data already published suggests that the cross-links and entanglements present in the matrix component of the keratin structure are concentrated rather than spread throughout the matrix.The above favors the series-zone model, which has been proposed to explain the mechanical properties of wool and hair fibers. '

show abstract

The Visco-Elastic Properties of Wool Fibres

Cited by 9 publications

References 14 publications

A Note on Nonlinear Viscoelasticity

A Note on Nonlinear Viscoelasticity

Creep of Wool Fibers

The Post-Yield Region and the Structure of Keratin

Contact Info

Product

Resources

About