Stress Relaxation of Tufted Carpets and Carpet Components

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dc.contributor.advisor Tushar K. Ghosh, Committee Chair en_US
dc.contributor.advisor William Oxenham, Committee Member en_US
dc.contributor.advisor Samuel C. Winchester, Committee Member en_US
dc.contributor.advisor David A. Dickey, Committee Member en_US Phillips, Kristie Jo en_US 2010-04-02T18:31:58Z 2010-04-02T18:31:58Z 2002-10-28 en_US
dc.identifier.other etd-10162002-173021 en_US
dc.description.abstract Dimensional stability of tufted carpets has been a continuing problem in the industry for years. When a tufted carpet is installed by the stretch method, it experiences stress relaxation over time which can cause the carpet to buckle, wrinkle and become loose with the only option being a costly re-stretching of the carpet. Since woven carpets seldom require re-stretching, the carpet buckling problem seems to be linked primarily to the tufted construction. This research seeks to analyze the various components of the tufted carpet composite structure and identify the role each component plays in the phenomenon of stress relaxation. Since a carpet is always stretched in both dimensions simultaneously during installation, understanding its biaxial stress decay is important. To this end, a biaxial loading system has been used to test various samples of the primary backing alone (before tufting), primary backing after tufting (with tufts), the secondary backing alone, and the finished carpet after attaching the backings with various binder weights per area. The four variables under consideration include: primary and secondary backing constructions, tufting density, and latex weight, with the secondary backing and latex weight expected to have the greatest effects on stress decay. In order to collect the most information, the biaxial test system was connected to a computer-based data acquisition system to continuously monitor stress levels and generate stress relaxation curves over a 20-hour testing period. A viscoelastic model that included representations of each component in the carpet structure was used to analyze and understand the influence of the components on the stress relaxation of carpets. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject carpet structure en_US
dc.subject stress relaxation en_US
dc.subject carpet en_US
dc.subject tufting en_US
dc.subject tufted primary en_US
dc.subject stress decay over time en_US
dc.subject load decay en_US
dc.subject laminated composites en_US
dc.subject primary backing en_US
dc.subject secondary backing en_US
dc.subject tufted carpets en_US
dc.subject viscoelastic modeling en_US
dc.title Stress Relaxation of Tufted Carpets and Carpet Components en_US PhD en_US dissertation en_US Textile Technology Management en_US

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