A study to ascertain the viability of ultrasonic nondestructive testing to determine the mechanical characteristics of wood/agricultural hardboards with soybean based adhesives

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dc.contributor.advisor Larry L. Bradshaw
dc.contributor.author Colen, Charles
dc.contributor.department Industrial Education and Technology
dc.date 2018-08-23T12:02:05.000
dc.date.accessioned 2020-06-30T07:16:18Z
dc.date.available 2020-06-30T07:16:18Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 1998
dc.date.issued 1998
dc.description.abstract <p>There have been numerous studies with ultrasonic nondestructive testing and wood fiber composites. The problem of the study was to ascertain whether ultrasonic nondestructive testing can be used in place of destructive testing to obtain the modulus of elasticity (MOE) of the wood/agricultural material with comparable results. The uniqueness of this research is that it addressed the type of content (cornstalks and switchgrass) being used with the wood fibers and the type of adhesives (soybean-based) associated with the production of these composite materials;Two research questions were addressed in the study. The major objective was to determine if one can predict the destructive test MOE value based on the nondestructive test MOE value. The population of the study was wood/agricultural fiberboards made from wood fibers, cornstalks, and switchgrass bonded together with soybean-based, urea-formaldehyde, and phenol-formaldehyde adhesives;Correlational analysis was used to determine if there was a relationship between the two tests. Regression analysis was performed to determine a prediction equation for the destructive test MOE value. Data were collected on both procedures using ultrasonic nondestructing testing and 3-point destructive testing;The results produced a simple linear regression model for this study which was adequate in the prediction of destructive MOE values if the nondestructive MOE value is known. An approximation very close to the entire error in the model equation was explained from the destructive test MOE values for the composites. The nondestructive MOE values used to produce a linear regression model explained 83% of the variability in the destructive test MOE values. The study also showed that, for the particular destructive test values obtained with the equipment used, the model associated with the study is as good as it could be due to the variability in the results from the destructive tests;In this study, an ultrasonic signal was used to determine the MOE values on nondestructive tests. Future research studies could use the same or other hardboards to examine how the resins affect the ultrasonic signal.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/11851/
dc.identifier.articleid 12850
dc.identifier.contextkey 6510342
dc.identifier.doi https://doi.org/10.31274/rtd-180813-10775
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/11851
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/65154
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/11851/r_9841043.pdf|||Fri Jan 14 18:59:45 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Industrial Engineering
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Wood Science and Pulp, Paper Technology
dc.subject.keywords Industrial education and technology
dc.title A study to ascertain the viability of ultrasonic nondestructive testing to determine the mechanical characteristics of wood/agricultural hardboards with soybean based adhesives
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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