A transistorized sonic generator and detector for finding Young's modulus of wooden beams Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/v405sc87x

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Young's modulus, often called the modulus of elasticity, gives a measure of the stiffness of a material to an imposed load. The modulus of a wooden beam is most often obtained by destructive tests which destroy the specimen. If a practical method can be found to measure Young's modulus non-destructively, several advantages can be realized: First, any number of specimens can be thoroughly tested and accepted or rejected according to the results of the measurement. Second, a single beam can be tested repeatedly. Finally, a wooden beam already in use can be measured. A background on the measurement of Young's modulus of wooden beams is presented. The standard destructive test is described as are several non-destructive techniques employing acoustics. Examples of non-destructive tests at sonic and ultrasonic frequencies are given. From this background a non-destructive method of testing which makes use of the reactions of a wooden beam when excited at its natural resonant frequency is selected for further study. The mathematical background necessary to interpret the results and to relate them to Young's modulus is developed. Test equipment is set up to determine the practicality of this method. Since this non-destructive method seems feasible, a sonic generator and detector is designed and constructed as a single unit. It is built with the qualifications that it be rugged, compact, easy to operate, and relatively inexpensive. The design calls for a variable frequency oscillator, a ten watt amplifier, excitation and detection transducers, a detection amplifier, and a display meter. The design of the equipment is discussed in detail, and the reliability and accuracy of the apparatus over an extended period of time are predicted. Methods of operation of the sonic generator and detector are discussed, and the results of a short series of measurements made with the equipment are presented.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi 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.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2014-06-17T17:28:14Z (GMT) No. of bitstreams: 1 JaenickeRichardA1963.pdf: 3392381 bytes, checksum: 6103056d5780c108422268f395aa7b3c (MD5)
  • description.provenance : Submitted by Lauren Kaysen (lkscannerosu@gmail.com) on 2014-06-05T21:30:53Z No. of bitstreams: 1 JaenickeRichardA1963.pdf: 13142354 bytes, checksum: df4feae276b84215ea8bb31807e95550 (MD5)
  • description.provenance : Made available in DSpace on 2014-06-17T18:39:35Z (GMT). No. of bitstreams: 1 JaenickeRichardA1963.pdf: 3392381 bytes, checksum: 6103056d5780c108422268f395aa7b3c (MD5) Previous issue date: 1962-06-08
  • description.provenance : Submitted by Lauren Kaysen (lkscannerosu@gmail.com) on 2014-06-17T16:56:38Z No. of bitstreams: 1 JaenickeRichardA1963.pdf: 3392381 bytes, checksum: 6103056d5780c108422268f395aa7b3c (MD5)
  • description.provenance : Rejected by Patricia Black(patricia.black@oregonstate.edu), reason: Replace on 2014-06-17T14:36:13Z (GMT)
  • description.provenance : Approved for entry into archive by Katy Davis(kdscannerosu@gmail.com) on 2014-06-17T18:39:35Z (GMT) No. of bitstreams: 1 JaenickeRichardA1963.pdf: 3392381 bytes, checksum: 6103056d5780c108422268f395aa7b3c (MD5)

Relationships

In Administrative Set:
Last modified: 08/04/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items