The Journal of the Japanese Society for Dental Materials and Devices
Online ISSN : 2188-4188
Print ISSN : 0286-5858
ISSN-L : 0286-5858
Original Article
Re-examination of Stress-strain Diagram of Dental Casting Alloys Using the Video Extensometer
Yuichi SOGAHisashi DOIHiroto MOCHIZUKIEquo KOBAYASHITakayuki YONEYAMAHitoshi HAMANAKA
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JOURNAL FREE ACCESS

2000 Volume 19 Issue 2 Pages 145-153

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Abstract
To re-examine the stress-strain diagram of dental casting alloy, that is, type 1 and type 4 gold alloy, Ag-Pd-Au alloy, and Co-Cr alloy, tensile test of the cast specimens was performed. The strain evaluated by a video extensometer and that estimated from the movement of the actuator of the test machine were compared. As a result, the former was effective in evaluating strain, while the latter should not be used because the shape to the yield point of the diagram. The elastic moduli evaluated by a video extensometer were significantly larger than those estimated from movement of the actuator, mainly owing to sliding between the grip wedge / specimen during the early stage of the tensile test. Furthermore, continuation of the sliding affects the stress-strain diagram and elongation. In conclusion, the extensometer was thought to be indispensable for working out the stress-strain diabram of dental materials.
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© 2000 The Japanese Society for Dental Materials and Devices
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