Tensile testing and fracture mechanism analysis of polyvinyl alcohol nanofibrous webs |
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| Authors: | Lihua Lou Weijie Yu Ronald J Kendall Ernest Smith Seshadri S Ramkumar |
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| Affiliation: | 1. Nonwovens and Advanced Materials Laboratory, Department of Environmental Toxicology, Texas Tech University, Lubbock, Texas;2. Wildlife Toxicology Laboratory, Department of Environmental Toxicology, Texas Tech University, Lubbock, Texas;3. Department of Environmental Toxicology, the Institute of Environmental and Human Health, Texas Tech University, Lubbock, Texas |
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| Abstract: | A tensile properties testing study was conducted to understand the influence of thickness, cross-head speed (speed of testing), gauge length (GL; specimen test length), and sample shape on important tensile properties of polyvinyl alcohol (PVA) nanofiber webs. The effects of each testing parameter on load at break, extension at break, Young's modulus, and tensile stress–strain curve of PVA nanofiber webs are analyzed. The Welch two sample t-tests show the significant difference among tested data. Using interaction plots, two-way analysis of variance, and margin mean plots, the interaction effects among testing parameters have been analyzed. Of all the factors, cross-head speed, the interaction among GL, and sample thickness (GL: Thickness) and the interaction among GL, testing speed and sample thickness (GL: Speed: Thickness) have significant influence on the tensile properties of PVA nanofiber webs. Moreover, the hypothesized model of mechanism of tensile strain–stress curve of PVA nanofiber webs has been proposed. Based on the model, the tensile strain–stress curve can be split into three stages: linear elastic, partial break up, and complete breakage. This study will provide a better understanding of tensile testing parameters' effects and their interaction effects on the tensile properties of nanowebs. |
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