Static and dynamic analyses of polyurethane impregnated Kevlar railcar bed Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/0z708z66x

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  • The properties of polyurethane impregnated Kevlar 29 bed were determined using Woven Fabric Micromechanics (WFM.) These properties were used to perform a linear static analysis on loaded coal-beds to compare maximum vertical deflection and stress distribution of single-bed model and double-bed model. Studies related to effect of radius of curvature of bed, effect of thickness of bed, effect of number of elements and effect of pressure on the maximum vertical deflection were done on the double-bed model. Geometrically nonlinear analysis was performed and compared with linear static analysis. The results from linear static analysis and geometrically nonlinear analysis were compared with the results from one-dimensional shallow shell equations and one-dimensional nonlinear membrane equations respectively. Studies show that the effect of geometrically nonlinear response was insignificant at low pressures but pronounced at very high pressures, for a configuration of the double-bed model. Free vibration analysis with lumped mass approach was performed on an undamped coal bed to extract the natural frequencies of the empty bed. Comparison of driving frequency with the lowest natural frequency revealed that forced vibration analysis (dynamic analysis) is essential to obtain realistic maximum vertical displacement response. Forced vibration analysis using direct-integration method was performed on an undamped double-bed model subjected to an alternating and sinusoidal load pattern at a driving frequency of 25 Hz. Results from forced vibration analysis show that the maximum vertical deflection occurred in the transient region of the response and exceeded the static response (obtained from the same loading conditions as the forced vibration case), by approximately 25%. However the system met the design constraints initially laid down. Further recommendations on the present problem were made to improve the design and analysis.
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  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6770A in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-11-05T18:22:43Z (GMT) No. of bitstreams: 1 HejeebuNarayanaRaoVSS1996.pdf: 7354806 bytes, checksum: 52fbc0d56c59d46e5716e57b8d10985f (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-11-05T19:18:50Z (GMT) No. of bitstreams: 1 HejeebuNarayanaRaoVSS1996.pdf: 7354806 bytes, checksum: 52fbc0d56c59d46e5716e57b8d10985f (MD5)
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