6—dimensional Relations in Unstrained and Strained Wool Fibres

Collins, J. D.; Chaikin, M.

doi:10.1080/19447026608662337

Cited by 12 publications

(3 citation statements)

References 5 publications

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“…Further evidence on this point comes from the work by Collins and Chaikin [5]. Once started, the striations propagate laterally very readily because of stress concentration at the advancing front, i.e., there is a transverse cascade failure.…”

Section: Resultsmentioning

confidence: 94%

Transverse Striations in Extended Wool Fibers

Haly

1970

Textile Research Journal

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Transverse striations can be seen in extended wool fibers under the optical microscope. This phenomenon has been further investigated by electron microscopy and other means. The optical effect arises from groups of small primary striations. At low over-all extensions, only a few striated regions can be seen. The local extension in such a region can be several times the over-all extension. The extension in a primary striation within a striated region would be still higher. Adjacent unstriated regions are at extensions lower than the over-all value. It is thought that the unfolding of α-keratin and formation of β-keratin during mechanical yield takes place in primary striations. Individual striations can have lateral dimensions large enough to occupy the whole cross section of a cortical cell.

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Section: Resultsmentioning

confidence: 94%

Transverse Striations in Extended Wool Fibers

Haly

1970

Textile Research Journal

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“…Collins and Chaikin [7] ] have shown that large variations ( 50% ) in cross-sectional area can occur in short lengths (12.5 mm) of pen-grown Merino fibers which may be considered as sound wool. Thus, with tender wools, the maximum variation in cross-sectional area of the fibers may be expected to be greater than 50% and the probability of a greater variation will increase with the length of the fibers.…”

Section: Discussionmentioning

confidence: 99%

A Ballistic Determination of the Toughness of Wool Staples

Samson

White

1970

Textile Research Journal

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A pendulum-type ballistic tester has been devised to measure the toughness of staples of wool. Using staples of varying tenderness from several types of wool, high correlations were found for the two sets of toughness values (and their ranking) obtained from the ballistic and a tensile testing machine. This and the ease and rapidity of the ballistic determination of the toughness of wool suggest its possible uses in the assessment of the quality of wool, in quality control work, and where the dynamic strength of wool for processing and end use is required.

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“…For example, they revealed that a typical keratin fiber with a coefficient of variation (CV) of 16% in crosssection extended 60% more than a uniform fiber with the same average cross-sectional area, when they were subjected to a particular load. Collins and Chaikin [5][6][7] conducted further study in this area. They used an analytical approach to examine the effect of nonuniformity on the tensile properties of nonuniform fibers of special geometries such as a cone.…”

Section: Introductionmentioning

confidence: 99%

Dynamic responses of irregular fibers under axial tension

Yan¹,

Li²,

Wang³

et al. 2009

J of Applied Polymer Sci

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A numerical study on the dynamic responses of irregular fibers under axial tension is presented in this article. The irregularity was represented by a sinusoidal shape profile along the fiber axis. The finite element method was used in the simulations and the maximum first principal stress due to the dynamic pulling has been examined. Our numerical results indicate that the first principal stress mainly varies along the longitudinal direction. Its change in radial direction is negligibly small. The maximum first principal stress in an irregular fiber always appears in the narrowest crosssection, which is the weakest link of the fiber. The maximum first principal stress is very sensitive to the change in the irregular amplitude. The stress value increases dramatically with the increase in the amplitude of irregularity. The frequency of irregularity has a limited effect on the maximum first principal stress.

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6—dimensional Relations in Unstrained and Strained Wool Fibres

Cited by 12 publications

References 5 publications

Transverse Striations in Extended Wool Fibers

Transverse Striations in Extended Wool Fibers

A Ballistic Determination of the Toughness of Wool Staples

Dynamic responses of irregular fibers under axial tension

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