Determination of shear modulus of single fibers

In order to characterize the torsional behavior of micron-scale specimens, a direct technique is established based on the principle of torsion balance. The technique applies twist to the specimen and balances the resulting torque against a torsion wire of known torsional rigidity. The torsional rigidity of the torsion wire is determined by a torsion pendulum. To measure the rotation of the torsion wire, a sensitive angle detector, comprised of a thin cross-beam attached between the torsion wire and the fiber specimen and a laser displacement sensor, is developed. The presented technique permits the measurement of torque in single fibers as low as 10-9 N•m with a reasonable resolution. Using this technique, torsion tests on micro-diameter copper wires, silver wires and carbon fibers were performed. The longitudinal shear modulus and other torsional properties of these samples, such as yielding shear stress, were obtained.

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“…, which gives carbon = E 235.4 ± 12.4 GPa. Therefore, the resulting that obtained by Tsai and Daniel[33] and Behlow et al[6].FIG. 8.…”

mentioning

confidence: 82%

Direct measurement of torsional properties of single fibers

Liu

Peng

2016

Meas. Sci. Technol.

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“…It has been established that an opening, Mode I type failure occurs as fibrils within the fiber become fibrillated and separate either through axial tension, axial compression, or transverse compression. It is also well understood that longitudinal shear (Mode II) properties of anisotropic fibers play a significant role in tensile loading . Both modes of deformation are seen in the peel test.…”

Section: Analysis Of Deformation In Uhmwpe Peeled Fibersmentioning

confidence: 98%

Single fiber peel test to assess ultra high molecular weight polyethylene fiber mesostructure interactions

McDaniel

Deitzel

Gregory

et al. 2018

J of Applied Polymer Sci

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In this work, a variable angle, single fiber peel test is developed to analyze the effects of fiber structure on the mixed mode failure within ultra high molecular weight polyethylene fibers. The Mode I and Mode II peel energy release rates are quantified and the effects of fiber meso/nanostructure on these modes are examined. Comparison of the load-extension curves from the peel test with in-situ video, and post-mortem analysis using high-resolution microscopy techniques indicates that Mode I and Mode II splitting are both significantly influenced by the deformation of nanoscale fibrils within a mesoscale network. The fibrils in the network are placed in tension across the peel/shear interface resulting in elevated values of peel energy release rates with an increasing number of engaged fibrils. The number of engaged fibrils is shown to increase with decreasing peel angle and increasing Mode II failure contribution. A bi-linear mixed-mode failure criterion is established. The results, and analysis of the fiber structure are discussed in context of their implications for load pathways in the fiber.

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“…Furthermore, the slope of these curves, in the linear segment, corresponds to the shear module G. Hence, the Young modulus can be easily determined taking in to account the following expression E = 3G. It is noteworthy to point out that there are other methods to determine the shear modulus (Tsai and Daniel 1999). Figures 10a and 10b show the Young modulus behavior of R and C fibers.…”

Section: Mechanical Characterizationmentioning

confidence: 98%

Composite Fiber Based on Sisal Fiber and Calcium Carbonate

Dante

Sánchez-Arévalo

Huerta

et al. 2014

Journal of Natural Fibers

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The impregnation of a raw sisal fiber in a saturated solution of calcium hydroxide generated a fiber coated by a remarkable quantity of calcium carbonate and calcium oxide. However, some detachments of the inorganic coating were observed at microscopic level, and interstices in the external walls, filled by the precipitated material, were less visible than in raw fiber. Additionally, some fiber components have been removed by the preliminary sodium silicate washing. The final composite exhibited more amorphous characteristics than the original raw fiber, as well as its mechanical behavior was very similar to an elastomeric material with more homogeneous mechanical properties than the original raw fiber.

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Determination of shear modulus of single fibers

Cited by 40 publications

References 6 publications

Direct measurement of torsional properties of single fibers

Direct measurement of torsional properties of single fibers

Single fiber peel test to assess ultra high molecular weight polyethylene fiber mesostructure interactions

Composite Fiber Based on Sisal Fiber and Calcium Carbonate

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