Zobrazeno 1 - 10
of 209
pro vyhledávání: '"Gary S. Schajer"'
Autor:
Gary S. Schajer
Publikováno v:
Journal of Wood Science, Vol 70, Iss 1, Pp 1-12 (2024)
Abstract A novel X-ray scanner system to identify the positions of knots in logs is described. The scanner has a simple, low-cost design that is suitable for use in medium and smaller sawmills. It makes X-ray measurements in an oblique direction as t
Externí odkaz:
https://doaj.org/article/f3d607f63116496882b0732e8cfb48ee
Autor:
F. Zanini Broetto, Gary S. Schajer
Publikováno v:
Experimental Mechanics. 62:471-482
The ESPI technique provides a sensitive method for measuring surface displacements. However, typical interferometers for 3-D measurements are complex and require numerous optical components and sophisticated lasers. The objective here is to design an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0ea6b99b2e86a68478cf774b0a3c4bbf
https://doi.org/10.1007/s11340-021-00802-w
https://doi.org/10.1007/s11340-021-00802-w
Autor:
Gary S. Schajer
Publikováno v:
Experimental Mechanics. 62:351-358
There is a large geometrical variation among the commercially available strain gauge rosettes used for hole-drilling residual stress measurements. Detailed calibration data are readily available only for the rosette types described in ASTM Standard T
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::758a343c5431448333a6138ab86b8832
https://doi.org/10.1007/s11340-021-00771-0
https://doi.org/10.1007/s11340-021-00771-0
Autor:
Gary S. Schajer
Publikováno v:
Experimental Mechanics. 61:1369-1380
Optical measurement techniques such as digital image correlation and speckle interferometry have been applied to hole-drilling evaluations of residual stress for some decades. These full-field non-contact measurements can have significant advantages
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::079800968d489eb7736c8e8559cf60ed
https://doi.org/10.1007/s11340-021-00740-7
https://doi.org/10.1007/s11340-021-00740-7
Autor:
Gary S. Schajer
Publikováno v:
Experimental Mechanics. 60:1265-1274
The radial design for strain gauge rosettes used for hole-drilling residual stress measurements was established over 50 years ago and has remained almost unchanged since then. The design was developed to promote strain sensitivity, but was made witho
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::69ed0fec2aa4a79d1780436eb1430f78
https://doi.org/10.1007/s11340-020-00660-y
https://doi.org/10.1007/s11340-020-00660-y
Autor:
Gary S. Schajer
Publikováno v:
Experimental Mechanics. 60:665-678
The conventional way to present Integral Method calibration data for hole-drilling residual stress measurements is in the form of a large triangular table of numbers. In the common case where 20 drilling steps are used for the hole-drilling measureme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b2b824a5001532da5b6faa0fb568f253
https://doi.org/10.1007/s11340-020-00587-4
https://doi.org/10.1007/s11340-020-00587-4
Autor:
Juuso Heikkinen, Gary S Schajer
Publikováno v:
Optics and Lasers in Engineering. 158:107124
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4b184b05fcacb4dd5d59b72e6b4cfcc4
https://doi.org/10.1016/j.optlaseng.2022.107124
https://doi.org/10.1016/j.optlaseng.2022.107124
Autor:
Harsh Pokharna, Gary S. Schajer
Publikováno v:
Optics and Lasers in Engineering. 121:181-188
Phase-stepped ESPI measurement techniques typically require the acquisition of sets of speckle images before and after specimen deformation. This process limits the use of the technique to quasi-static specimens. A novel technique is proposed here wh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4a922d44fc7cb5ad6d3c397c39c44dbb
https://doi.org/10.1016/j.optlaseng.2019.04.012
https://doi.org/10.1016/j.optlaseng.2019.04.012
Autor:
Gary S. Schajer, Juuso Heikkinen
Publikováno v:
Advancement of Optical Methods & Digital Image Correlation in Experimental Mechanics ISBN: 9783030597726
Two-dimensional Digital Image Correlation (2D-DIC) is a popular method for determining object in-plane motion and deformation by tracing surface texture. However, the applicability of the method is limited by perspective errors that may be generated
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::01304393d741ef5f4ab6c6e17474534a
https://doi.org/10.1007/978-3-030-59773-3_9
https://doi.org/10.1007/978-3-030-59773-3_9
Autor:
Juuso Heikkinen, Gary S. Schajer
Publikováno v:
Optics and Lasers in Engineering. 149:106820
2D Digital Image Correlation (2D DIC) enables full-field in-plane displacement measurement by tracking the physical surface texture in the recorded images. However, because camera magnification is inversely proportional to object distance, points alo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f1a5b8ed95f5601b09db59d62b868d9a
https://doi.org/10.1016/j.optlaseng.2021.106820
https://doi.org/10.1016/j.optlaseng.2021.106820