Graduate Thesis Or Dissertation
 

Polyurethane impregnated Kevlar 29 fabric for coal transport railcars

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/bz60d0840

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  • Stress analysis was performed to determine the maximum stress acting on a railcar coal support-bed, using COSMOS finite element and WFM micromechanics models. The fracture strength of polyurethane impregnated Kevlar 29 fabric, proposed for integration with the railcar structure, was determined experimentally by loading the impregnated coupons in a microcomputer controlled Instron 4505. Procedures to improve the wettability of a Kevlar 29 orthogonal-weave fabric were investigated. Unimpregnated and impregnated coupons of increasing gage lengths were statically tested for tensile strength to check for gage length effect behavior. Fatigue tests were conducted to predict the stress level (endurance limit) below which the impregnated fabric bed can perform without failure for ten years of the service life. The fracture strength of the polyurethane impregnated fabric, after immersion in aqueous solutions of different pH values for seventy-five hours and in ten percent concentrated sulfuric acid solution at 212°F for ten hours, was measured.
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