An Attempt to Quantify the Translation of Fiber Bundle Tenacity into Yarn Tenacity

1976 ◽  
Vol 46 (11) ◽  
pp. 822-827 ◽  
Author(s):  
P. Neelakantan ◽  
T. A. Subramanian
Keyword(s):  
Fiber Bundle ◽  
Breaking Load ◽  
Gauge Length ◽  
Length Effect ◽  
The Real ◽  
Yarn Tenacity

The concept of a real yarn tenacity, derived by making an allowance for fiber obliquity and for the fibers that do not contribute to the yarn breaking load, has been postulated. An equation has been derived to enable the calculation of real yarn tenacity. In the case of man-made fibers that exhibit only a very weak gauge-length effect in their bundle tenacity, the real yarn tenacity has been shown to be equal to the fiber bundle tenacity at all levels of twist beyond the minimum required to ensure an interlocking structure. In the case of cotton, the effective gauge length for which the bundle tenacity is equal to the real yarn tenacity has been found to depend upon the level of twist in the yarn, being of the order of 1 mm for yarns that have more than the optimum twist.

scholarly journals Oxidation Induced Stress-Rupture of Fiber Bundles

1997 ◽  
Author(s):  
Edgar Lara-Curzio
Keyword(s):  
Fiber Bundle ◽  
Fiber Strength ◽  
Stress Rupture ◽  
Gauge Length ◽  
Fiber Bundles ◽  
Thermal Dependence ◽  
Induced Stress ◽  
Loss Of Strength ◽  
Special Case ◽  
Rupture Behavior

The effect of oxidation on the stress-rupture behavior of fiber bundles was modeled. It is shown that oxidation-induced fiber strength degradation results in the delayed failure of the associated fiber bundle and that the fiber bundle strength decreases with time as t−1/4. It is also shown that the temperature dependence of the bundle loss of strength reflects the thermal dependence of the mechanism controlling the oxidation of the fibers. The effect of gauge length on the fiber bundle strength was also analyzed. Numerical examples are presented for the special case of Nicalon™ fibers.

Gauge length effect on the tensile properties of leather

2006 ◽  
Vol 101 (2) ◽  
pp. 1202-1209 ◽  
Author(s):  
Palanisamy Thanikaivelan ◽  
Dennis C. Shelly ◽  
Seshadri S. Ramkumar
Keyword(s):  
Tensile Properties ◽  
Gauge Length ◽  
Length Effect

Relationship of Some Fiber Properties with Yarn-Strength Parameters of Jute

1976 ◽  
Vol 46 (7) ◽  
pp. 519-521 ◽  
Author(s):  
N. Geo Paul
Keyword(s):  
Fiber Bundle ◽  
Air Flow ◽  
Strength Parameters ◽  
Yarn Strength ◽  
Flow Method ◽  
Fiber Properties ◽  
Yarn Quality ◽  
Yarn Tenacity ◽  
Relationship Of ◽  
The Relationship

Jute fiber properties commonly determined are strength and fineness. The relationship of these fiber properties with the various yarn-strength parameters are discussed. Though fiber bundle strength is closely associated with yarn tenacity, it does not explain satisfactorily the variation in yarn quality. Fineness measured by the air-flow method does not show significant correlation with yarn tenacity.

Interpretations of Single Fiber, Bundle, and Yarn Tenacity Data

1991 ◽  
Vol 61 (11) ◽  
pp. 681-690 ◽  
Author(s):  
Preston E. Sasser ◽  
Frederick M. Shofner ◽  
Youe T. Chu ◽  
C. Kyle Shofner ◽  
Mark G. Townes
Keyword(s):  
Fiber Bundle ◽  
Single Fiber ◽  
Yarn Tenacity

Length effect on the performance of lumber in tension

1990 ◽  
Vol 17 (6) ◽  
pp. 911-918 ◽  
Author(s):  
Frank Lam ◽  
Erol Varoglu
Keyword(s):  
Tensile Strength ◽  
Reliability Index ◽  
Strength Properties ◽  
Gauge Length ◽  
Short Term ◽  
Length Effect ◽  
Performance Factor ◽  
First Order Second Moment ◽  
Tension Members ◽  
Term Performance

A study was conducted to evaluate the effect of gauge length on the short-term performance of visually graded Select Structural and No. 2 kiln-dried nominal 38 × 89 mm spruce-pine-fir lumber in tension parallel-to-grain. The short-term tensile strength properties of three groups of lumber, matched for modulus of elasticity and having gauge lengths of 2642, 3683, 4877 mm, were obtained from test results where the effect of gauge length was isolated from the effect of grade. The performance of the lumber was evaluated by first-order second-moment reliability analyses. In the analyses, the lumber was treated as single tension members under uniform tensile stress along the member length, undergoing snow load conditions at various locations in Canada. The results indicate that the performance factor for Select Structural spruce-pine-fir lumber in tension parallel-to-grain should be multiplied by a factor of 0.92 to adjust for doubling the length from 2500 to 5000 mm to achieve a common reliability index of 3.0. The effect of doubling the length from 2500 to 5000 mm on the performance of No. 2 spruce-pine-fir lumber appears to be negligible. Key words: length effect, tensile strength, lumber, performance factor, reliability index.

scholarly journals Oxidation Induced Stress-Rupture of Fiber Bundles

1998 ◽  
Vol 120 (2) ◽  
pp. 105-109 ◽  
Author(s):  
Edgar Lara-Curzio
Keyword(s):  
Fiber Bundle ◽  
Fiber Strength ◽  
Stress Rupture ◽  
Gauge Length ◽  
Fiber Bundles ◽  
Thermal Dependence ◽  
Induced Stress ◽  
Loss Of Strength ◽  
Special Case ◽  
Rupture Behavior

The effect of oxidation on the stress-rupture behavior of fiber bundles was modeled. It is shown that oxidation-induced fiber strength degradation results in the delayed failure of the associated fiber bundle and that the fiber bundle strength decreases with time as t-1/4. It is also shown that the temperature dependence of the bundle loss of strength reflects the thermal dependence of the mechanism controlling the oxidation of the fibers. The effect of gauge length on the fiber bundle strength was also analyzed. Numerical examples are presented for the special case of Nicalon™ fibers.

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