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Stress Analysis of Various Shaped PMMA Using Babinet Compensator in Reflection Polariscope
Paper Type  |
Contributed Paper |
Title |
Stress Analysis of Various Shaped PMMA Using Babinet Compensator in Reflection Polariscope |
Author |
Yongyut Manjit, Chanokporn Chaiwong, Apichart Limpichaipanit and Athipong Ngamjarurojana |
Email |
ngamjarurojana@yahoo.com |
|
Abstract: The induced stress relations of PMMA (Poly methyl methacrylate) were investigated by twopoint loading of hydraulic press system at top and bottom 535.4, 688.6, 841.6 and 994.6 N of various
shapes in square, octagon, dodecagon and circular disk. All of samples had the same diagonal length
and thickness of 2.5 and 0.6 cm respectively. We observed the number of fringe order of isochromatic
fringe pattern at first quadrant of sample by using Babinet compensator in reflection polariscope. The
net number of fringe order was used to calculate the relative maximum number of fringe order in
horizontal direction of sample by equation of Nmax - Ni. And this parameter was used to analyze the
stress distribution in samples. It was found that the dark band could be observed at the edge of first
straight edge of square, octagon and dodecagon shape but dark band did not appear on the edge of
disk. The maximum fringe orders of octagon, dodecagon and circular disk at X/R = 0.0, Y/R = 0.9
were 15 fringe orders and the maximum fringe order of square at X/R = 0.0, Y/R = 0.8 was 8.81 fringe
orders. Fringe order at contact area decreased along vertical direction and minimum fringe orders at
X/R = 0.5, Y/R = 0.0 of square, octagon, dodecagon and circular disk were 3.53, 3.35, 2.62 and 3.72
fringe orders respectively. The relative number of fringe order of square was more than octagon and
dodecagon. It means that the transmission of stress in horizontal direction of square was more than
octagon and dodecagon.
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Start & End Page |
598 - 606 |
Received Date |
2019-09-11 |
Revised Date |
2019-10-20 |
Accepted Date |
2019-10-30 |
Full Text |
Download |
Keyword |
stress analysis, reflection photoelasticity, babinet compensator, various shapes |
Volume |
Vol.47 No.3 (May 2020) |
DOI |
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Citation |
Manjit Y., Chaiwong C., Limpichaipanit A. and Ngamjarurojana A., Stress Analysis of Various Shaped PMMA Using Babinet Compensator in Reflection Polariscope, Chiang Mai Journal of Science, 2020; 47(3): 598-606. |
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page: 787 - 798
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