Single-fiber fragmentation technique

Values of interfacial shear strength measured with the single-fiber fragmentation technique was used as a reference to compare the results from the single-fiber techniques. 

The single-fiber fragmentation technique appears to be very sensitive to interphase conditions as reflected by the aspect ratios (critical fiber fragment length... 

Single fiber fragmentation technique Ksi/MPa (IJd) Microindentation technique Ksi/MPa Microbond technique Ksi/MPa... 

Netravali, A.N., Topoleski, L.T.T., Sachse, W.H. and Phoenix, S.L. (1989c). An acoustic emission technique for measuring fiber fragment length distributions in single fiber composite test. Composites Sci. Technol. 35, 13-29. 

Next to PLM, IR spectroscopy (principally, micro-IR) makes up the most important family of techniques in fiber analysis. As with PLM, IR spectroscopy is minimally destructive or nondestruchve and is useful on even the smallest fiber fragments. Microspectrophotometry (MSP) probes the chemical identification of the synthetic fiber, colorants, and other treatments. MSP is indispensable in the comparative analysis of questioned and known fibers, the central task of most forensic fiber analysis cases. The caveat is that such comparisons require knowledge of typical inter- and intrasample variation. Consider, for example, a pair of blue jeans typically, fibers from along the seams and hems are worn compared with fibers to other portions of the garment. Also, the source from which a sample is obtained will clearly affect any visible spectra and color analysis. Along a single fiber, characteristics of a dye or colorant will vary as well. Such inherent variations must be factored into any conclusions drawn from a comparative analysis, be it of dye or chemical composition. 

Microdroplet specimens were prepared in a similar fashion to Eichorn and Young [27], except that strands of molten Pebax 7033 were placed onto the surface of an aramid fiber [28]. For the fragmentation study, single fiber composite samples were prepared and subjected to increasing levels of strain on a Minimat tensile rig. The technique for the single fiber pull out test is described elsewhere [28]. 

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