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" Manufacturing and mechanics of polymer matrix composites "
Md Shariful Islam
Prabhakar, Pavana
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Latin Dissertation
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| Language of Document
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English
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| Record Number
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804168
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| Doc. No
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TL48987
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| Call number
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1834609430; 10151183
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| Main Entry
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Qudah-Refai, Somia
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| Title & Author
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Manufacturing and mechanics of polymer matrix composites\ Md Shariful IslamPrabhakar, Pavana
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| College
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The University of Texas at El Paso
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| Date
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2016
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| Degree
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Ph.D.
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| field of study
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Mechanical Engineering
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| student score
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2016
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| Page No
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131
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| Note
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Committee members: Carrasco, Cesar; Lin, Yirong; Ramana, Chintalapalle
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| Note
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Place of publication: United States, Ann Arbor; ISBN=978-1-369-05947-2
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| Abstract
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Fiber-reinforced composite materials are widely used in the aerospace and automobile industries. Their strength-to-weight and stiffness-to-weight ratios make them suitable to be used in spacecraft, especially as cryogenic tank materials. One of the focus of this dissertation is to investigate the application of woven carbon and Kevlar<sup>®</sup> fiber composites as cryogenic tank materials. Tensile, bending and short beam shear tests are performed on rectangular specimens at room temperature and after cryogenic exposure (-196°C). It is found that the mechanical properties of these composite materials do not degrade significantly due to cryogenic exposure. It is observed that the failure mode took place before and after the cryogenic exposure is identical, which implies that the carbon and Kevlar<sup>® </sup> fiber composite can be used as a cryogenic tank materials. Hybridization of this two types of composites (carbon and Kevlar<sup>®</sup> fiber) is also studied. A computational study is conducted to reduce the number of experiments, and to find the optimum combination of carbon and Kevlar<sup> ®</sup> fiber reinforcements. Thirty different combinations of hybrid composites are studied computationally and six of these combinations are found suitable based on minimum number of peak stress and minimum peak stress value. This six optimum combinations along with some other combinations are manufactured by using the Vacuum Assisted Resin Transfer Molding (VARTM) process to facilitate comparative study. Comparison of mechanical test results performed on full cryogenic exposure, gradient exposure and pristine materials shows that the hybrid composites can be used as cryogenic tank materials.
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| Subject
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Mechanical engineering
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| Descriptor
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Applied sciences;Additive manufacturing;Finite element analysis;Free edge effect;Hybrid composites;Interface strengthening;Woven composites
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| Added Entry
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Prabhakar, Pavana
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Mechanical EngineeringThe University of Texas at El Paso
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