Acoustic emission (AE) of fiber break is the sound waves reflecting the stress waves of material during rupturing. It can be employed to evaluate the tensile properties of single fiber during the fiber-bundle tensile test. The key to this technique is to identify AEs of fibers at the break point accurately. However, the severe interference introduced by the background noise and the inter-fiber friction is inevitable. In this paper, a filtering method based on the wavelet de-noising is used to remove the background noise. In order to identify the fiber-broken AEs, a combined parameter that characterizes the amplitude and the density fluctuation along the time axis is proposed. Multiple test results indicate that this parameter can be used to identify wool fiber-broken AEs with accuracy rates higher than 95%.
DanielsH. The maximum of a Gaussian process whose mean path has a maximum, with an application to the strength of bundles of fibres. Adv Appl Probab1989; 21: 315–333.
2.
ColemanB. On the strength of classical fibres and fibre bundles. J Mech Phys Solid1958; 7: 60–70.
3.
NachaneRIyerKK. Prediction of bundle strength from single-fiber test data. Textil Res J1980; 50: 639–641.
4.
DanielsH. The statistical theory of the strength of bundles of threads I. Proc Roy Soc Lond Math Phys Sci1945; 183: 405–435.
5.
RadhakrishnanTShelatB. Tensile behavior of cut skeins and single threads. Textil Res J1961; 31: 1063–1069.
6.
VasLMRáczZ. Modeling and testing the fracture process of impregnated carbon-fiber roving specimens during bending: Part I–Fiber bundle model. J Compos Mater2004; 38: 1757–1785.
7.
FrydrychI. Relation of single fiber and bundle strengths of cotton. Textil Res J1995; 65: 513–521.
8.
BeattieA. Acoustic emission, principles and instrumentation, Albuquerque, NM: Sandia National Labs, 1983.
9.
EitzenDWadleyH. Acoustic emission: establishing the fundamentals. J Res Natl Bur Stand1984; 89: 75–100.
10.
GiordanoMCalabroAEspositoC. An acoustic-emission characterization of the failure modes in polymer-composite materials. Compos Sci Tech1998; 58: 1923–1928.
11.
NarisawaIObaH. An evaluation of acoustic emission from fibre-reinforced composites. J Mater Sci1984; 19: 1777–1786.
12.
MarecAThomasJ-HEl GuerjoumaR. Damage characterization of polymer-based composite materials: Multivariable analysis and wavelet transform for clustering acoustic emission data. Mech Syst Signal Process2008; 22: 1441–1464.
13.
HamstadMAMooreRL. Acoustic emission from single and multiple Kevlar 49 filament breaks. J Compos Mater1986; 20: 46–66.
14.
R’MiliMMoevusMGodinN. Statistical fracture of E-glass fibres using a bundle tensile test and acoustic emission monitoring. Compos Sci Tech2008; 68: 1800–1808.
15.
JihanSSiddiquiASweetM. Fracture strength of E-glass fibre strands using acoustic emission. NDT & E Int1997; 30: 383–388.
16.
CowkingAAttouASiddiquiA. Testing E-glass fibre bundles using acoustic emission. J Mater Sci1991; 26: 1301–1310.
17.
OkoroaforEHillR. Investigation of complex failure modes in fibre bundles during dynamic mechanical testing using acoustic emission and Weibull statistics. J Mater Sci1995; 30: 4233–4243.
18.
WilsonDM. Statistical tensile strength of nextelTM 610 and nextelTM 720 fibres. J Mater Sci1997; 32: 2535–2542.
19.
LissartNLamonJ. Statistical analysis of failure of SiC fibres in the presence of bimodal flaw populations. J Mater Sci1997; 32: 6107–6117.
20.
OskoueiARAhmadiM. Fracture strength distribution in E-glass fiber using acoustic emission. J Compos Mater2010; 44: 693–705.
21.
PerepelkinKE. New impulse-acoustic method for testing and estimating the transversal unevenness and defectiveness of filaments in chemical yarns. Fibre Textil East Eur2007; 15: 36–36.
22.
LyonsDWGrahamJ. Acoustic measurement of fiber properties. Textil Res J1975; 45: 549–553.
23.
VeluYKEllisonMSDaiJ. Single fiber acoustic emission and tensile properties from cotton bundle fracture tests. Textil Res J1999; 69: 616–620.
24.
HillROkoroaforE. Weibull statistics of fibre bundle failure using mechanical and acoustic emission testing: the influence of interfibre friction. Composites1995; 26: 699–705.
25.
PhoenixSLWuE. Statistics for the time-dependent failure of Kevlar-49/epoxy composites: Micromechanical modeling and data interpretation, Livermore, CA: CA: Lawrence Livermore National Lab., 1983.
26.
DonohoDL. De-noising by soft-thresholding. IEEE Trans Inform Theor1995; 41: 613–627.
27.
MallatSHwangWL. Singularity detection and processing with wavelets. IEEE Trans Inform Theor1992; 38: 617–643.
28.
DonohoDLJohnstoneIM. Minimax estimation via wavelet shrinkage. Ann Stat1998; 26: 879–921.
29.
YuWChuC. Textile physics, 2nd ed. Shanghai: Donghua University Press, 2002, pp. 315–318.
