Viscoelastic properties of seed cotton and their effect on module shape and density

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dc.contributor.advisor Searcy , Stephen W . en_US
dc.contributor.committeeMember Parnell , Calvin B . en_US
dc.creator Hardin , Robert Glen en_US 2004 -11 -15T19 :52 :55Z 2014 -02 -19T18 :34 :42Z 2004 -11 -15T19 :52 :55Z 2014 -02 -19T18 :34 :42Z 2004 -08 en_US 2004 -11 -15T19 :52 :55Z
dc.identifier.uri http : / /hdl .handle .net /1969 .1 /1269
dc.description.abstract Modules for cotton storage and transport should be constructed with a shape that will resist collecting water to maintain the quality of seed cotton during storage . Meeting this specification requires knowledge of the relationship between the applied compressive force , deformation , and time for seed cotton . Several factors were tested to determine their effects on the height and density of seed cotton during compression , creep loading , and recovery . Models were used to describe these processes . These results were used to develop an algorithm capable of providing information on module shape to the module builder operator . The initial loading density did not affect the compressed density , but a slight effect was observed in the recovered density , due to the weight of the seed cotton . Picker harvested cotton was compressed to a greater density than stripper harvested cotton , but expanded more during recovery , resulting in similar final densities . Multiple compressions increased the density , but this increase was not physically significant after the third compression . Higher moisture content increased the density seed cotton could be compressed to slightly . Viscoelastic behavior was observed ; however , the effect on density was small . Both the compression and creep curves were described using mathematical models . A compression model using an asymptotic true strain measure yielded high R2 values ; however , some aspect of this process remained unexplained and the equation was limited in its predictive ability . Creep behavior was described using a modified Burgers model . This model was more accurate than the creep model , although a definite trend existed in the creep model residuals . A feedback algorithm was developed based on the observation that the compressed density was primarily dependent on the mass of seed cotton and not the initial density . By measuring the compressed depth of cotton in a module and the hydraulic pressure of the tramper foot cylinder , the resulting shape of the module can be predicted . Improved loading of the module builder is necessary to produce a desirably shaped module . More seed cotton needs to be placed in the center of the module , resulting in a surface that slopes down towards the outer edges . en_US
dc.format.extent 610176 bytes
dc.format.medium electronic en_US
dc.format.mimetype application /pdf
dc.language.iso en _US en_US
dc.publisher Texas A &M University en_US
dc.subject cotton en_US
dc.title Viscoelastic properties of seed cotton and their effect on module shape and density en_US
dc.type Book en
dc.type.genre Electronic Thesis en_US
dc.type.material text en_US
dc.format.digitalOrigin born digital en_US


Viscoelastic properties of seed cotton and their effect on module shape and density. Available electronically from http : / /hdl .handle .net /1969 .1 /1269 .

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