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Nondestructive evaluation of wood properties by stress wave spectral analysis

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dc.contributor.authorShaler, Stephen M., author
dc.contributor.authorBodig, Jozsef, author
dc.contributor.authorHistand, Michael B., author
dc.contributor.authorColorado State University. Civil Engineering Department, publisher
dc.date.accessioned2023-03-20T15:42:20Z
dc.date.available2023-03-20T15:42:20Z
dc.date.issued1982-11
dc.description.abstractThe influence of selected properties on the propagation of stress waves in wood was investigated. Waveform analysis of the stress waves was performed using spectral analysis techhniques developed for stationary random processes. Information analyzed from the stress waves included wave velocity, energy spectra, and the frequency response function. Three wood properties investigated as to their influence on stress waves propagation were grain angle, moisture content, and weight loss caused by decay. Significant relationships between grain angle and the wave properties of velocity, amplitude gain, and total gain were obtained. Significant damping of the stress waves was observed at large grain angles and moisture content values above the fiber saturation point. No significant equations were found for consistent prediction of moisture content. The results of the decay study showed that as weight loss increased, the ratio of energy of the stress wave to that input to the specimen decreased for the perpendicular to grain case. Two approaches toward prediction of wood strength were investigated. The first method employed prediction of wood properties from the stress wave spectral characteristics. Known relationships between these wood properties and strength were then utilized. The second approach involved direct correlation of the stress wave spectral properties with strength. Significant correlatlons with strength were obtained using both approaches. Application of basic results are discussed as to their applicability toward development of an [sic] nondestructive evaluatlon (NOE) procedure for wood poles used in transmission line structures.
dc.format.mediumtechnical reports
dc.identifier.urihttps://hdl.handle.net/10217/236371
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relationTA 630 .S86
dc.relationCatalog record number (MMS ID): 991012913659703361
dc.relation.ispartofCivil Engineering Reports
dc.relation.ispartofStructural research report, no. 43
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectWood -- Testing
dc.subjectStress waves
dc.titleNondestructive evaluation of wood properties by stress wave spectral analysis
dc.typeText
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